C++ pj_str函数代码示例

/*
 * Keep-alive test.
 */
static int keep_alive_test(pj_stun_config *cfg)
{
    struct stun_srv *srv;
    struct stun_client *client;
    pj_sockaddr_in mapped_addr;
    pj_stun_sock_info info;
    pj_str_t srv_addr;
    pj_time_val timeout, t;
    int i, ret = 0;
    pj_status_t status;

    PJ_LOG(3,(THIS_FILE, "  normal operation"));

    status =  create_client(cfg, &client, PJ_TRUE);
    if (status != PJ_SUCCESS)
	return -310;

    status = create_server(client->pool, cfg->ioqueue, RESPOND_STUN|WITH_XOR_MAPPED, &srv);
    if (status != PJ_SUCCESS) {
	destroy_client(client);
	return -320;
    }

    /*
     * Part 1: initial Binding resolution.
     */
    PJ_LOG(3,(THIS_FILE, "    initial Binding request"));
    srv_addr = pj_str("127.0.0.1");
    status = pj_stun_sock_start(client->sock, &srv_addr, 
				pj_ntohs(srv->addr.ipv4.sin_port), NULL);
    if (status != PJ_SUCCESS) {
	destroy_server(srv);
	destroy_client(client);
	return -330;
    }

    /* Wait until on_status() callback is called with success status */
    pj_gettimeofday(&timeout);
    timeout.sec += 60;
    do {
	handle_events(cfg, 100);
	pj_gettimeofday(&t);
    } while (client->on_status_cnt==0 && PJ_TIME_VAL_LT(t, timeout));

    /* Check that callback with correct operation is called */
    if (client->last_op != PJ_STUN_SOCK_BINDING_OP) {
	PJ_LOG(3,(THIS_FILE, "    error: expecting Binding operation status"));
	ret = -340;
	goto on_return;
    }
    if (client->last_status != PJ_SUCCESS) {
	PJ_LOG(3,(THIS_FILE, "    error: expecting PJ_SUCCESS status"));
	ret = -350;
	goto on_return;
    }
    /* Check that client doesn't receive anything */
    if (client->on_rx_data_cnt != 0) {
	PJ_LOG(3,(THIS_FILE, "    error: client shouldn't have received anything"));
	ret = -370;
	goto on_return;
    }

    /* Get info */
    pj_bzero(&info, sizeof(info));
    pj_stun_sock_get_info(client->sock, &info);

    /* Check that we have server address */
    if (!pj_sockaddr_has_addr(&info.srv_addr)) {
	PJ_LOG(3,(THIS_FILE, "    error: missing server address"));
	ret = -380;
	goto on_return;
    }
    /* .. and bound address port must not be zero */
    if (pj_sockaddr_get_port(&info.bound_addr)==0) {
	PJ_LOG(3,(THIS_FILE, "    error: bound address is zero"));
	ret = -381;
	goto on_return;
    }
    /* .. and mapped address */
    if (!pj_sockaddr_has_addr(&info.mapped_addr)) {
	PJ_LOG(3,(THIS_FILE, "    error: missing mapped address"));
	ret = -382;
	goto on_return;
    }
    /* verify the mapped address */
    pj_sockaddr_in_init(&mapped_addr, &srv->ip_to_send, srv->port_to_send);
    if (pj_sockaddr_cmp(&info.mapped_addr, &mapped_addr) != 0) {
	PJ_LOG(3,(THIS_FILE, "    error: mapped address mismatched"));
	ret = -383;
	goto on_return;
    }

    /* .. and at least one alias */
    if (info.alias_cnt == 0) {
	PJ_LOG(3,(THIS_FILE, "    error: must have at least one alias"));
	ret = -384;
	goto on_return;
//.........这里部分代码省略.........

/*
 * Initialize and start SRTP session with the given parameters.
 */
PJ_DEF(pj_status_t) pjmedia_transport_srtp_start(
			   pjmedia_transport *tp, 
			   const pjmedia_srtp_crypto *tx,
			   const pjmedia_srtp_crypto *rx)
{
    transport_srtp  *srtp = (transport_srtp*) tp;
    srtp_policy_t    tx_;
    srtp_policy_t    rx_;
    err_status_t     err;
    int		     cr_tx_idx = 0;
    int		     au_tx_idx = 0;
    int		     cr_rx_idx = 0;
    int		     au_rx_idx = 0;
    int		     crypto_suites_cnt;
    pj_status_t	     status = PJ_SUCCESS;

    PJ_ASSERT_RETURN(tp && tx && rx, PJ_EINVAL);

    pj_lock_acquire(srtp->mutex);

    if (srtp->session_inited) {
	pjmedia_transport_srtp_stop(tp);
    }

    crypto_suites_cnt = sizeof(crypto_suites)/sizeof(crypto_suites[0]);

    /* Get encryption and authentication method */
    cr_tx_idx = au_tx_idx = get_crypto_idx(&tx->name);
    if (tx->flags & PJMEDIA_SRTP_NO_ENCRYPTION)
	cr_tx_idx = 0;
    if (tx->flags & PJMEDIA_SRTP_NO_AUTHENTICATION)
	au_tx_idx = 0;

    cr_rx_idx = au_rx_idx = get_crypto_idx(&rx->name);
    if (rx->flags & PJMEDIA_SRTP_NO_ENCRYPTION)
	cr_rx_idx = 0;
    if (rx->flags & PJMEDIA_SRTP_NO_AUTHENTICATION)
	au_rx_idx = 0;

    /* Check whether the crypto-suite requested is supported */
    if (cr_tx_idx == -1 || cr_rx_idx == -1 || au_tx_idx == -1 || 
	au_rx_idx == -1)
    {
	status = PJMEDIA_SRTP_ENOTSUPCRYPTO;
	goto on_return;
    }

    /* If all options points to 'NULL' method, just bypass SRTP */
    if (cr_tx_idx == 0 && cr_rx_idx == 0 && au_tx_idx == 0 && au_rx_idx == 0) {
	srtp->bypass_srtp = PJ_TRUE;
	goto on_return;
    }

    /* Check key length */
    if (tx->key.slen != (pj_ssize_t)crypto_suites[cr_tx_idx].cipher_key_len ||
        rx->key.slen != (pj_ssize_t)crypto_suites[cr_rx_idx].cipher_key_len)
    {
	status = PJMEDIA_SRTP_EINKEYLEN;
	goto on_return;
    }

    /* Init transmit direction */
    pj_bzero(&tx_, sizeof(srtp_policy_t));
    pj_memmove(srtp->tx_key, tx->key.ptr, tx->key.slen);
    if (cr_tx_idx && au_tx_idx)
	tx_.rtp.sec_serv    = sec_serv_conf_and_auth;
    else if (cr_tx_idx)
	tx_.rtp.sec_serv    = sec_serv_conf;
    else if (au_tx_idx)
	tx_.rtp.sec_serv    = sec_serv_auth;
    else
	tx_.rtp.sec_serv    = sec_serv_none;
    tx_.key		    = (uint8_t*)srtp->tx_key;
    tx_.ssrc.type	    = ssrc_any_outbound;
    tx_.ssrc.value	    = 0;
    tx_.rtp.cipher_type	    = crypto_suites[cr_tx_idx].cipher_type;
    tx_.rtp.cipher_key_len  = crypto_suites[cr_tx_idx].cipher_key_len;
    tx_.rtp.auth_type	    = crypto_suites[au_tx_idx].auth_type;
    tx_.rtp.auth_key_len    = crypto_suites[au_tx_idx].auth_key_len;
    tx_.rtp.auth_tag_len    = crypto_suites[au_tx_idx].srtp_auth_tag_len;
    tx_.rtcp		    = tx_.rtp;
    tx_.rtcp.auth_tag_len   = crypto_suites[au_tx_idx].srtcp_auth_tag_len;
    tx_.next		    = NULL;
    err = srtp_create(&srtp->srtp_tx_ctx, &tx_);
    if (err != err_status_ok) {
	status = PJMEDIA_ERRNO_FROM_LIBSRTP(err);
	goto on_return;
    }
    srtp->tx_policy = *tx;
    pj_strset(&srtp->tx_policy.key,  srtp->tx_key, tx->key.slen);
    srtp->tx_policy.name=pj_str(crypto_suites[get_crypto_idx(&tx->name)].name);


    /* Init receive direction */
    pj_bzero(&rx_, sizeof(srtp_policy_t));
    pj_memmove(srtp->rx_key, rx->key.ptr, rx->key.slen);
    if (cr_rx_idx && au_rx_idx)
//.........这里部分代码省略.........

/* Get IP interface for sending to the specified destination */
PJ_DEF(pj_status_t) pj_getipinterface(int af,
                                      const pj_str_t *dst,
                                      pj_sockaddr *itf_addr,
                                      pj_bool_t allow_resolve,
                                      pj_sockaddr *p_dst_addr)
{
    pj_sockaddr dst_addr;
    pj_sock_t fd;
    int len;
    pj_uint8_t zero[64];
    pj_status_t status;

    pj_sockaddr_init(af, &dst_addr, NULL, 53);
    status = pj_inet_pton(af, dst, pj_sockaddr_get_addr(&dst_addr));
    if (status != PJ_SUCCESS) {
	/* "dst" is not an IP address. */
	if (allow_resolve) {
	    status = pj_sockaddr_init(af, &dst_addr, dst, 53);
	} else {
	    pj_str_t cp;

	    if (af == PJ_AF_INET) {
		cp = pj_str("1.1.1.1");
	    } else {
		cp = pj_str("1::1");
	    }
	    status = pj_sockaddr_init(af, &dst_addr, &cp, 53);
	}

	if (status != PJ_SUCCESS)
	    return status;
    }

    /* Create UDP socket and connect() to the destination IP */
    status = pj_sock_socket(af, pj_SOCK_DGRAM(), 0, &fd);
    if (status != PJ_SUCCESS) {
	return status;
    }

    status = pj_sock_connect(fd, &dst_addr, pj_sockaddr_get_len(&dst_addr));
    if (status != PJ_SUCCESS) {
	pj_sock_close(fd);
	return status;
    }

    len = sizeof(*itf_addr);
    status = pj_sock_getsockname(fd, itf_addr, &len);
    if (status != PJ_SUCCESS) {
	pj_sock_close(fd);
	return status;
    }

    pj_sock_close(fd);

    /* Check that the address returned is not zero */
    pj_bzero(zero, sizeof(zero));
    if (pj_memcmp(pj_sockaddr_get_addr(itf_addr), zero,
		  pj_sockaddr_get_addr_len(itf_addr))==0)
    {
	return PJ_ENOTFOUND;
    }

    if (p_dst_addr)
	*p_dst_addr = dst_addr;

    return PJ_SUCCESS;
}

//Wrap start & stop
PJ_DECL(pj_status_t) csipsimple_init(pjsua_config *ua_cfg,
		pjsua_logging_config *log_cfg, pjsua_media_config *media_cfg,
		csipsimple_config *css_cfg, jobject context) {
	pj_status_t result;

	/* Create memory pool for application. */
	css_var.pool = pjsua_pool_create("css", 1000, 1000);
	PJ_ASSERT_RETURN(css_var.pool, PJ_ENOMEM);

	// Finalize configuration
	log_cfg->cb = &pj_android_log_msg;
	if (css_cfg->turn_username.slen) {
		media_cfg->turn_auth_cred.type = PJ_STUN_AUTH_CRED_STATIC;
		media_cfg->turn_auth_cred.data.static_cred.realm = pj_str("*");
		pj_strdup_with_null(css_var.pool,
				&media_cfg->turn_auth_cred.data.static_cred.username,
				&css_cfg->turn_username);

		if (css_cfg->turn_password.slen) {
			media_cfg->turn_auth_cred.data.static_cred.data_type =
					PJ_STUN_PASSWD_PLAIN;
			pj_strdup_with_null(css_var.pool,
					&media_cfg->turn_auth_cred.data.static_cred.data,
					&css_cfg->turn_password);
		}
	}

	// Static cfg
	extern pj_bool_t pjsip_use_compact_form;
	extern pj_bool_t pjsip_include_allow_hdr_in_dlg;
	extern pj_bool_t pjmedia_add_rtpmap_for_static_pt;
	extern pj_bool_t pjsua_no_update;

	pjsua_no_update = css_cfg->use_no_update ? PJ_TRUE : PJ_FALSE;

	pjsip_use_compact_form =
			css_cfg->use_compact_form_headers ? PJ_TRUE : PJ_FALSE;
	/* do not transmit Allow header */
	pjsip_include_allow_hdr_in_dlg =
			css_cfg->use_compact_form_headers ? PJ_FALSE : PJ_TRUE;
	/* Do not include rtpmap for static payload types (<96) */
	pjmedia_add_rtpmap_for_static_pt =
			css_cfg->use_compact_form_sdp ? PJ_FALSE : PJ_TRUE;

	css_tcp_keep_alive_interval = css_cfg->tcp_keep_alive_interval;
	css_tls_keep_alive_interval = css_cfg->tls_keep_alive_interval;

	// Audio codec cfg
	css_var.extra_aud_codecs_cnt = css_cfg->extra_aud_codecs_cnt;
	unsigned i;
	for (i = 0; i < css_cfg->extra_aud_codecs_cnt; i++) {
		dynamic_factory *css_codec = &css_var.extra_aud_codecs[i];
		dynamic_factory *cfg_codec = &css_cfg->extra_aud_codecs[i];

		pj_strdup_with_null(css_var.pool, &css_codec->shared_lib_path,
				&cfg_codec->shared_lib_path);
		pj_strdup_with_null(css_var.pool, &css_codec->init_factory_name,
				&cfg_codec->init_factory_name);

	}
	// Video codec cfg -- For now only destroy is useful but for future
	// hopefully vid codec mgr will behaves as audio does
	// Also in this case destroy will become obsolete
	css_var.extra_vid_codecs_cnt = css_cfg->extra_vid_codecs_cnt;
	for (i = 0; i < css_cfg->extra_vid_codecs_cnt; i++) {
		dynamic_factory *css_codec = &css_var.extra_vid_codecs[i];
		dynamic_factory *cfg_codec = &css_cfg->extra_vid_codecs[i];

		pj_strdup_with_null(css_var.pool, &css_codec->shared_lib_path,
				&cfg_codec->shared_lib_path);
		pj_strdup_with_null(css_var.pool, &css_codec->init_factory_name,
				&cfg_codec->init_factory_name);


		css_codec = &css_var.extra_vid_codecs_destroy[i];
		cfg_codec = &css_cfg->extra_vid_codecs_destroy[i];

		pj_strdup_with_null(css_var.pool, &css_codec->shared_lib_path,
				&cfg_codec->shared_lib_path);
		pj_strdup_with_null(css_var.pool, &css_codec->init_factory_name,
				&cfg_codec->init_factory_name);

	}


	// ZRTP cfg
	css_var.default_use_zrtp = css_cfg->use_zrtp;
	ua_cfg->cb.on_create_media_transport = &on_transport_created_wrapper;

#if defined(PJMEDIA_HAS_ZRTP) && PJMEDIA_HAS_ZRTP!=0
	pj_ansi_snprintf(css_var.zid_file, sizeof(css_var.zid_file),
			"%.*s/simple.zid", css_cfg->storage_folder.slen,
			css_cfg->storage_folder.ptr);
#endif

	JNIEnv *jni_env = 0;
	ATTACH_JVM(jni_env);
	css_var.context = (*jni_env)->NewGlobalRef(jni_env, context);
	DETACH_JVM(jni_env);
//.........这里部分代码省略.........

/* Parse crypto attribute line */
static pj_status_t parse_attr_crypto(pj_pool_t *pool,
				     const pjmedia_sdp_attr *attr,
				     pjmedia_srtp_crypto *crypto,
				     int *tag)
{
    pj_str_t input;
    char *token;
    int token_len;
    pj_str_t tmp;
    pj_status_t status;
    int itmp;

    pj_bzero(crypto, sizeof(*crypto));
    pj_strdup_with_null(pool, &input, &attr->value);

    /* Tag */
    token = strtok(input.ptr, " ");
    if (!token) {
	PJ_LOG(4,(THIS_FILE, "Attribute crypto expecting tag"));
	return PJMEDIA_SDP_EINATTR;
    }
    token_len = pj_ansi_strlen(token);

    /* Tag must not use leading zeroes. */
    if (token_len > 1 && *token == '0')
	return PJMEDIA_SDP_EINATTR;

    /* Tag must be decimal, i.e: contains only digit '0'-'9'. */
    for (itmp = 0; itmp < token_len; ++itmp)
	if (!pj_isdigit(token[itmp]))
	    return PJMEDIA_SDP_EINATTR;

    /* Get tag value. */
    *tag = atoi(token);

    /* Crypto-suite */
    token = strtok(NULL, " ");
    if (!token) {
	PJ_LOG(4,(THIS_FILE, "Attribute crypto expecting crypto suite"));
	return PJMEDIA_SDP_EINATTR;
    }
    crypto->name = pj_str(token);

    /* Key method */
    token = strtok(NULL, ":");
    if (!token) {
	PJ_LOG(4,(THIS_FILE, "Attribute crypto expecting key method"));
	return PJMEDIA_SDP_EINATTR;
    }
    if (pj_ansi_stricmp(token, "inline")) {
	PJ_LOG(4,(THIS_FILE, "Attribute crypto key method '%s' not supported!",
	          token));
	return PJMEDIA_SDP_EINATTR;
    }

    /* Key */
    token = strtok(NULL, "| ");
    if (!token) {
	PJ_LOG(4,(THIS_FILE, "Attribute crypto expecting key"));
	return PJMEDIA_SDP_EINATTR;
    }
    tmp = pj_str(token);
    if (PJ_BASE64_TO_BASE256_LEN(tmp.slen) > MAX_KEY_LEN) {
	PJ_LOG(4,(THIS_FILE, "Key too long"));
	return PJMEDIA_SRTP_EINKEYLEN;
    }

    /* Decode key */
    crypto->key.ptr = (char*) pj_pool_zalloc(pool, MAX_KEY_LEN);
    itmp = MAX_KEY_LEN;
    status = pj_base64_decode(&tmp, (pj_uint8_t*)crypto->key.ptr, 
			      &itmp);
    if (status != PJ_SUCCESS) {
	PJ_LOG(4,(THIS_FILE, "Failed decoding crypto key from base64"));
	return status;
    }
    crypto->key.slen = itmp;

    return PJ_SUCCESS;
}

//.........这里部分代码省略.........
	status = pjsip_endpt_create_response_fwd(global.endpt, rdata, 0, 
						 &tdata);
	if (status != PJ_SUCCESS) {
	    app_perror("Error creating response", status);
	    return;
	}

	/* Get topmost Via header of the new response */
	hvia = (pjsip_via_hdr*) pjsip_msg_find_hdr(tdata->msg, PJSIP_H_VIA, 
						   NULL);
	if (hvia == NULL) {
	    /* Invalid response! Just drop it */
	    pjsip_tx_data_dec_ref(tdata);
	    return;
	}

	/* Calculate the address to forward the response */
	pj_bzero(&res_addr, sizeof(res_addr));
	res_addr.dst_host.type = PJSIP_TRANSPORT_UDP;
	res_addr.dst_host.flag = 
	    pjsip_transport_get_flag_from_type(PJSIP_TRANSPORT_UDP);

	/* Destination address is Via's received param */
	res_addr.dst_host.addr.host = hvia->recvd_param;
	if (res_addr.dst_host.addr.host.slen == 0) {
	    /* Someone has messed up our Via header! */
	    res_addr.dst_host.addr.host = hvia->sent_by.host;
	}

	/* Destination port is the rport */
	if (hvia->rport_param != 0 && hvia->rport_param != -1)
	    res_addr.dst_host.addr.port = hvia->rport_param;

	if (res_addr.dst_host.addr.port == 0) {
	    /* Ugh, original sender didn't put rport!
	     * At best, can only send the response to the port in Via.
	     */
	    res_addr.dst_host.addr.port = hvia->sent_by.port;
	}

	/* Forward response with the UAS transaction */
	pjsip_tsx_send_msg(uac_data->uas_tsx, tdata);

    }

    /* If UAC transaction is terminated, terminate the UAS as well.
     * This could happen because of:
     *	- timeout on the UAC side
     *  - receipt of 2xx response to INVITE
     */
    if (tsx->state == PJSIP_TSX_STATE_TERMINATED && uac_data &&
	uac_data->uas_tsx) 
    {

	pjsip_transaction *uas_tsx;
	struct uas_data *uas_data;

	uas_tsx = uac_data->uas_tsx;
	uas_data = (struct uas_data*) uas_tsx->mod_data[mod_tu.id];
	uas_data->uac_tsx = NULL;

	if (event->body.tsx_state.type == PJSIP_EVENT_TIMER) {

	    /* Send 408/Timeout if this is an INVITE transaction, since
	     * we must have sent provisional response before. For non
	     * INVITE transaction, just destroy it.
	     */
	    if (tsx->method.id == PJSIP_INVITE_METHOD) {

		pjsip_tx_data *tdata = uas_tsx->last_tx;

		tdata->msg->line.status.code = PJSIP_SC_REQUEST_TIMEOUT;
		tdata->msg->line.status.reason = pj_str("Request timed out");
		tdata->msg->body = NULL;

		pjsip_tx_data_add_ref(tdata);
		pjsip_tx_data_invalidate_msg(tdata);

		pjsip_tsx_send_msg(uas_tsx, tdata);

	    } else {
		/* For non-INVITE, just destroy the UAS transaction */
		pjsip_tsx_terminate(uas_tsx, PJSIP_SC_REQUEST_TIMEOUT);
	    }

	} else if (event->body.tsx_state.type == PJSIP_EVENT_RX_MSG) {

	    if (uas_tsx->state < PJSIP_TSX_STATE_TERMINATED) {
		pjsip_msg *msg;
		int code;

		msg = event->body.tsx_state.src.rdata->msg_info.msg;
		code = msg->line.status.code;

		uac_data->uas_tsx = NULL;
		pjsip_tsx_terminate(uas_tsx, code);
	    }
	}
    }
}

/* 
 * Create stream based on the codec, dir, remote address, etc. 
 */
static pj_status_t create_stream( pj_pool_t *pool,
				  pjmedia_endpt *med_endpt,
				  const pjmedia_codec_info *codec_info,
				  pjmedia_dir dir,
				  pj_uint16_t local_port,
				  const pj_sockaddr_in *rem_addr,
#if defined(PJMEDIA_HAS_SRTP) && (PJMEDIA_HAS_SRTP != 0)
				  pj_bool_t use_srtp,
				  const pj_str_t *crypto_suite,
				  const pj_str_t *srtp_tx_key,
				  const pj_str_t *srtp_rx_key,
#endif
				  pjmedia_stream **p_stream )
{
    pjmedia_stream_info info;
    pjmedia_transport *transport = NULL;
    pj_status_t status;
#if defined(PJMEDIA_HAS_SRTP) && (PJMEDIA_HAS_SRTP != 0)
    pjmedia_transport *srtp_tp = NULL;
#endif


    /* Reset stream info. */
    pj_bzero(&info, sizeof(info));


    /* Initialize stream info formats */
    info.type = PJMEDIA_TYPE_AUDIO;
    info.dir = dir;
    pj_memcpy(&info.fmt, codec_info, sizeof(pjmedia_codec_info));
    info.tx_pt = codec_info->pt;
    info.rx_pt = codec_info->pt;
    info.ssrc = pj_rand();
    
#if PJMEDIA_HAS_RTCP_XR && PJMEDIA_STREAM_ENABLE_XR
    /* Set default RTCP XR enabled/disabled */
    info.rtcp_xr_enabled = PJ_TRUE;
#endif

    /* Copy remote address */
    pj_memcpy(&info.rem_addr, rem_addr, sizeof(pj_sockaddr_in));

    /* If remote address is not set, set to an arbitrary address
     * (otherwise stream will assert).
     */
    if (info.rem_addr.addr.sa_family == 0) {
	const pj_str_t addr = pj_str("127.0.0.1");
	pj_sockaddr_in_init(&info.rem_addr.ipv4, &addr, 0);
    }

    /* Create media transport */
    status = pjmedia_transport_udp_create(med_endpt, NULL, local_port,
					  0, &transport);
    if (status != PJ_SUCCESS)
	return status;

#if defined(PJMEDIA_HAS_SRTP) && (PJMEDIA_HAS_SRTP != 0)
    /* Check if SRTP enabled */
    if (use_srtp) {
	pjmedia_srtp_crypto tx_plc, rx_plc;

	status = pjmedia_transport_srtp_create(med_endpt, transport, 
					       NULL, &srtp_tp);
	if (status != PJ_SUCCESS)
	    return status;

	pj_bzero(&tx_plc, sizeof(pjmedia_srtp_crypto));
	pj_bzero(&rx_plc, sizeof(pjmedia_srtp_crypto));

	tx_plc.key = *srtp_tx_key;
	tx_plc.name = *crypto_suite;
	rx_plc.key = *srtp_rx_key;
	rx_plc.name = *crypto_suite;
	
	status = pjmedia_transport_srtp_start(srtp_tp, &tx_plc, &rx_plc);
	if (status != PJ_SUCCESS)
	    return status;

	transport = srtp_tp;
    }
#endif

    /* Now that the stream info is initialized, we can create the 
     * stream.
     */

    status = pjmedia_stream_create( med_endpt, pool, &info, 
				    transport, 
				    NULL, p_stream);

    if (status != PJ_SUCCESS) {
	app_perror(THIS_FILE, "Error creating stream", status);
	pjmedia_transport_close(transport);
	return status;
    }


//.........这里部分代码省略.........

/*
 * main()
 */
int main(int argc, char *argv[])
{
    pj_caching_pool cp;
    pjmedia_endpt *med_endpt;
    pj_pool_t *pool;
    pjmedia_port *rec_file_port = NULL, *play_file_port = NULL;
    pjmedia_master_port *master_port = NULL;
    pjmedia_snd_port *snd_port = NULL;
    pjmedia_stream *stream = NULL;
    pjmedia_port *stream_port;
    char tmp[10];
    pj_status_t status; 

#if defined(PJMEDIA_HAS_SRTP) && (PJMEDIA_HAS_SRTP != 0)
    /* SRTP variables */
    pj_bool_t use_srtp = PJ_FALSE;
    char tmp_tx_key[64];
    char tmp_rx_key[64];
    pj_str_t  srtp_tx_key = {NULL, 0};
    pj_str_t  srtp_rx_key = {NULL, 0};
    pj_str_t  srtp_crypto_suite = {NULL, 0};
    int	tmp_key_len;
#endif

    /* Default values */
    const pjmedia_codec_info *codec_info;
    pjmedia_codec_param codec_param;
    pjmedia_dir dir = PJMEDIA_DIR_DECODING;
    pj_sockaddr_in remote_addr;
    pj_uint16_t local_port = 4000;
    char *codec_id = NULL;
    char *rec_file = NULL;
    char *play_file = NULL;

    enum {
	OPT_CODEC	= 'c',
	OPT_LOCAL_PORT	= 'p',
	OPT_REMOTE	= 'r',
	OPT_PLAY_FILE	= 'w',
	OPT_RECORD_FILE	= 'R',
	OPT_SEND_RECV	= 'b',
	OPT_SEND_ONLY	= 's',
	OPT_RECV_ONLY	= 'i',
#if defined(PJMEDIA_HAS_SRTP) && (PJMEDIA_HAS_SRTP != 0)
	OPT_USE_SRTP	= 'S',
#endif
	OPT_SRTP_TX_KEY	= 'x',
	OPT_SRTP_RX_KEY	= 'y',
	OPT_HELP	= 'h',
    };

    struct pj_getopt_option long_options[] = {
	{ "codec",	    1, 0, OPT_CODEC },
	{ "local-port",	    1, 0, OPT_LOCAL_PORT },
	{ "remote",	    1, 0, OPT_REMOTE },
	{ "play-file",	    1, 0, OPT_PLAY_FILE },
	{ "record-file",    1, 0, OPT_RECORD_FILE },
	{ "send-recv",      0, 0, OPT_SEND_RECV },
	{ "send-only",      0, 0, OPT_SEND_ONLY },
	{ "recv-only",      0, 0, OPT_RECV_ONLY },
#if defined(PJMEDIA_HAS_SRTP) && (PJMEDIA_HAS_SRTP != 0)
	{ "use-srtp",	    2, 0, OPT_USE_SRTP },
	{ "srtp-tx-key",    1, 0, OPT_SRTP_TX_KEY },
	{ "srtp-rx-key",    1, 0, OPT_SRTP_RX_KEY },
#endif
	{ "help",	    0, 0, OPT_HELP },
	{ NULL, 0, 0, 0 },
    };

    int c;
    int option_index;


    pj_bzero(&remote_addr, sizeof(remote_addr));


    /* init PJLIB : */
    status = pj_init();
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1);


    /* Parse arguments */
    pj_optind = 0;
    while((c=pj_getopt_long(argc,argv, "h", long_options, &option_index))!=-1) {

	switch (c) {
	case OPT_CODEC:
	    codec_id = pj_optarg;
	    break;

	case OPT_LOCAL_PORT:
	    local_port = (pj_uint16_t) atoi(pj_optarg);
	    if (local_port < 1) {
		printf("Error: invalid local port %s\n", pj_optarg);
		return 1;
	    }
	    break;
//.........这里部分代码省略.........

/*
 * Parse fmtp for specified format/payload type.
 */
static void parse_fmtp( pj_pool_t *pool,
			const pjmedia_sdp_media *m,
			unsigned pt,
			pjmedia_codec_fmtp *fmtp)
{
    const pjmedia_sdp_attr *attr;
    pjmedia_sdp_fmtp sdp_fmtp;
    char *p, *p_end, fmt_buf[8];
    pj_str_t fmt;

    pj_assert(m && fmtp);

    pj_bzero(fmtp, sizeof(pjmedia_codec_fmtp));

    /* Get "fmtp" attribute for the format */
    pj_ansi_sprintf(fmt_buf, "%d", pt);
    fmt = pj_str(fmt_buf);
    attr = pjmedia_sdp_media_find_attr2(m, "fmtp", &fmt);
    if (attr == NULL)
	return;

    /* Parse "fmtp" attribute */
    if (pjmedia_sdp_attr_get_fmtp(attr, &sdp_fmtp) != PJ_SUCCESS)
	return;

    /* Prepare parsing */
    p = sdp_fmtp.fmt_param.ptr;
    p_end = p + sdp_fmtp.fmt_param.slen;

    /* Parse */
    while (p < p_end) {
	char *token, *start, *end;

	/* Skip whitespaces */
	while (p < p_end && (*p == ' ' || *p == '\t')) ++p;
	if (p == p_end)
	    break;

	/* Get token */
	start = p;
	while (p < p_end && *p != ';' && *p != '=') ++p;
	end = p - 1;

	/* Right trim */
	while (end >= start && (*end == ' '  || *end == '\t' || 
				*end == '\r' || *end == '\n' ))
	    --end;

	/* Forward a char after trimming */
	++end;

	/* Store token */
	if (end > start) {
	    token = (char*)pj_pool_alloc(pool, end - start);
	    pj_ansi_strncpy(token, start, end - start);
	    if (*p == '=')
		/* Got param name */
		pj_strset(&fmtp->param[fmtp->cnt].name, token, end - start);
	    else
		/* Got param value */
		pj_strset(&fmtp->param[fmtp->cnt++].val, token, end - start);
	} else if (*p != '=') {
	    ++fmtp->cnt;
	}

	/* Next */
	++p;
    }
}

static int https_client_test(unsigned ms_timeout)
{
    pj_pool_t *pool = NULL;
    pj_ioqueue_t *ioqueue = NULL;
    pj_timer_heap_t *timer = NULL;
    pj_ssl_sock_t *ssock = NULL;
    pj_ssl_sock_param param;
    pj_status_t status;
    struct test_state state = {0};
    pj_sockaddr local_addr, rem_addr;
    pj_str_t tmp_st;

    pool = pj_pool_create(mem, "https_get", 256, 256, NULL);

    status = pj_ioqueue_create(pool, 4, &ioqueue);
    if (status != PJ_SUCCESS) {
	goto on_return;
    }

    status = pj_timer_heap_create(pool, 4, &timer);
    if (status != PJ_SUCCESS) {
	goto on_return;
    }

    state.pool = pool;
    state.send_str = HTTP_REQ;
    state.send_str_len = pj_ansi_strlen(state.send_str);
    state.is_verbose = PJ_TRUE;

    pj_ssl_sock_param_default(&param);
    param.cb.on_connect_complete = &ssl_on_connect_complete;
    param.cb.on_data_read = &ssl_on_data_read;
    param.cb.on_data_sent = &ssl_on_data_sent;
    param.ioqueue = ioqueue;
    param.user_data = &state;
    param.server_name = pj_str((char*)HTTP_SERVER_ADDR);
    param.timer_heap = timer;
    param.timeout.sec = 0;
    param.timeout.msec = ms_timeout;
    param.proto = PJ_SSL_SOCK_PROTO_SSL23;
    pj_time_val_normalize(&param.timeout);

    status = pj_ssl_sock_create(pool, &param, &ssock);
    if (status != PJ_SUCCESS) {
	goto on_return;
    }

    pj_sockaddr_init(PJ_AF_INET, &local_addr, pj_strset2(&tmp_st, "0.0.0.0"), 0);
    pj_sockaddr_init(PJ_AF_INET, &rem_addr, pj_strset2(&tmp_st, HTTP_SERVER_ADDR), HTTP_SERVER_PORT);
    status = pj_ssl_sock_start_connect(ssock, pool, &local_addr, &rem_addr, sizeof(rem_addr));
    if (status == PJ_SUCCESS) {
	ssl_on_connect_complete(ssock, PJ_SUCCESS);
    } else if (status == PJ_EPENDING) {
	status = PJ_SUCCESS;
    } else {
	goto on_return;
    }

    /* Wait until everything has been sent/received */
    while (state.err == PJ_SUCCESS && !state.done) {
#ifdef PJ_SYMBIAN
	pj_symbianos_poll(-1, 1000);
#else
	pj_time_val delay = {0, 100};
	pj_ioqueue_poll(ioqueue, &delay);
	pj_timer_heap_poll(timer, &delay);
#endif
    }

    if (state.err) {
	status = state.err;
	goto on_return;
    }

    PJ_LOG(3, ("", "...Done!"));
    PJ_LOG(3, ("", ".....Sent/recv: %d/%d bytes", state.sent, state.recv));

on_return:
    if (ssock && !state.err && !state.done) 
	pj_ssl_sock_close(ssock);
    if (ioqueue)
	pj_ioqueue_destroy(ioqueue);
    if (timer)
	pj_timer_heap_destroy(timer);
    if (pool)
	pj_pool_release(pool);

    return status;
}

/* Parse crypto attribute line */
static pj_status_t parse_attr_crypto(pj_pool_t *pool,
				     const pjmedia_sdp_attr *attr,
				     pjmedia_srtp_crypto *crypto,
				     int *tag)
{
    pj_str_t input;
    char *token;
    pj_str_t tmp;
    pj_status_t status;
    int itmp;

    pj_bzero(crypto, sizeof(*crypto));
    pj_strdup_with_null(pool, &input, &attr->value);

    /* Tag */
    token = strtok(input.ptr, " ");
    if (!token) {
	PJ_LOG(4,(THIS_FILE, "Attribute crypto expecting tag"));
	return PJMEDIA_SDP_EINATTR;
    }
    *tag = atoi(token);
    if (*tag == 0)
	return PJMEDIA_SDP_EINATTR;

    /* Crypto-suite */
    token = strtok(NULL, " ");
    if (!token) {
	PJ_LOG(4,(THIS_FILE, "Attribute crypto expecting crypto suite"));
	return PJMEDIA_SDP_EINATTR;
    }
    crypto->name = pj_str(token);

    /* Key method */
    token = strtok(NULL, ":");
    if (!token) {
	PJ_LOG(4,(THIS_FILE, "Attribute crypto expecting key method"));
	return PJMEDIA_SDP_EINATTR;
    }
    if (pj_ansi_stricmp(token, "inline")) {
	PJ_LOG(4,(THIS_FILE, "Attribute crypto key method '%s' not supported!",
	          token));
	return PJMEDIA_SDP_EINATTR;
    }

    /* Key */
    token = strtok(NULL, "| ");
    if (!token) {
	PJ_LOG(4,(THIS_FILE, "Attribute crypto expecting key"));
	return PJMEDIA_SDP_EINATTR;
    }
    tmp = pj_str(token);
    crypto->key.ptr = (char*) pj_pool_zalloc(pool, MAX_KEY_LEN);

    /* Decode key */
    itmp = MAX_KEY_LEN;
    status = pj_base64_decode(&tmp, (pj_uint8_t*)crypto->key.ptr, 
			      &itmp);
    if (status != PJ_SUCCESS) {
	PJ_LOG(4,(THIS_FILE, "Failed decoding crypto key from base64"));
	return status;
    }
    crypto->key.slen = itmp;

    return PJ_SUCCESS;
}

/* main()
 *
 * If called with argument, treat argument as SIP URL to be called.
 * Otherwise wait for incoming calls.
 */
int main(int argc, char *argv[])
{
    struct pj_getopt_option long_options[] = {
        { "local-port",	1, 0, 'p' },
        { "tcp",	0, 0, 't' },
        { "ipv6",	0, 0, '6' },
        { "help", 	0, 0, 'h' }
    };
    int c, option_index;

    pj_log_set_level(5);

    pj_init();

    sip_af = pj_AF_INET();

    pj_optind = 0;
    while ((c = pj_getopt_long(argc, argv, "p:t6h", long_options,
                               &option_index)) != -1)
    {
	switch (c) {
	case 'p':
	    sip_port = atoi(pj_optarg);
	    break;
	case 't':
	    sip_tcp = PJ_TRUE;
	    break;
	case 'h':
	    usage();
	    return 0;
	case '6':
	    sip_af = pj_AF_INET6();
	    break;
	default:
	    PJ_LOG(1,(THIS_FILE,
		      "Argument \"%s\" is not valid. Use --help to see help",
		      argv[pj_optind-1]));
	    return -1;
	}
    }

    if (init_stack())
	goto on_error;

    /* If URL is specified, then make call immediately. */
    if (pj_optind != argc) {
	pj_sockaddr hostaddr;
	char hostip[PJ_INET6_ADDRSTRLEN+2];
	char temp[80];
	call_t *call;
	pj_str_t dst_uri = pj_str(argv[pj_optind]);
	pj_str_t local_uri;
	pjsip_dialog *dlg;
	pj_status_t status;
	pjsip_tx_data *tdata;

	if (pj_gethostip(sip_af, &hostaddr) != PJ_SUCCESS) {
	    PJ_LOG(1,(THIS_FILE, "Unable to retrieve local host IP"));
	    goto on_error;
	}
	pj_sockaddr_print(&hostaddr, hostip, sizeof(hostip), 2);

	pj_ansi_sprintf(temp, "<sip:[email protected]%s:%d>",
			hostip, sip_port);
	local_uri = pj_str(temp);

	call = &app.call[0];

	status = pjsip_dlg_create_uac( pjsip_ua_instance(),
				       &local_uri,  /* local URI */
				       &local_uri,  /* local Contact */
				       &dst_uri,    /* remote URI */
				       &dst_uri,    /* remote target */
				       &dlg);	    /* dialog */
	if (status != PJ_SUCCESS) {
	    app_perror(THIS_FILE, "Unable to create UAC dialog", status);
	    return 1;
	}

	status = pjsip_inv_create_uac( dlg, NULL, 0, &call->inv);
	if (status != PJ_SUCCESS) goto on_error;

	call->inv->mod_data[mod_sipecho.id] = call;

	status = pjsip_inv_invite(call->inv, &tdata);
	if (status != PJ_SUCCESS) goto on_error;

	status = pjsip_inv_send_msg(call->inv, tdata);
	if (status != PJ_SUCCESS) goto on_error;

	puts("Press ENTER to quit...");
    } else {
	puts("Ready for incoming calls. Press ENTER to quit...");
    }

//.........这里部分代码省略.........

static pj_bool_t on_rx_request( pjsip_rx_data *rdata )
{
    pj_sockaddr hostaddr;
    char temp[80], hostip[PJ_INET6_ADDRSTRLEN];
    pj_str_t local_uri;
    pjsip_dialog *dlg;
    pjsip_rdata_sdp_info *sdp_info;
    pjmedia_sdp_session *answer = NULL;
    pjsip_tx_data *tdata = NULL;
    call_t *call = NULL;
    unsigned i;
    pj_status_t status;

    PJ_LOG(3,(THIS_FILE, "RX %.*s from %s",
	      (int)rdata->msg_info.msg->line.req.method.name.slen,
	      rdata->msg_info.msg->line.req.method.name.ptr,
	      rdata->pkt_info.src_name));

    if (rdata->msg_info.msg->line.req.method.id == PJSIP_REGISTER_METHOD) {
	/* Let me be a registrar! */
	pjsip_hdr hdr_list, *h;
	pjsip_msg *msg;
	int expires = -1;

	pj_list_init(&hdr_list);
	msg = rdata->msg_info.msg;
	h = (pjsip_hdr*)pjsip_msg_find_hdr(msg, PJSIP_H_EXPIRES, NULL);
	if (h) {
	    expires = ((pjsip_expires_hdr*)h)->ivalue;
	    pj_list_push_back(&hdr_list, pjsip_hdr_clone(rdata->tp_info.pool, h));
	    PJ_LOG(3,(THIS_FILE, " Expires=%d", expires));
	}
	if (expires != 0) {
	    h = (pjsip_hdr*)pjsip_msg_find_hdr(msg, PJSIP_H_CONTACT, NULL);
	    if (h)
		pj_list_push_back(&hdr_list, pjsip_hdr_clone(rdata->tp_info.pool, h));
	}

	pjsip_endpt_respond(app.sip_endpt, &mod_sipecho, rdata, 200, NULL,
	                    &hdr_list, NULL, NULL);
	return PJ_TRUE;
    }

    if (rdata->msg_info.msg->line.req.method.id != PJSIP_INVITE_METHOD) {
	if (rdata->msg_info.msg->line.req.method.id != PJSIP_ACK_METHOD) {
	    pj_str_t reason = pj_str("Go away");
	    pjsip_endpt_respond_stateless( app.sip_endpt, rdata,
					   400, &reason,
					   NULL, NULL);
	}
	return PJ_TRUE;
    }

    sdp_info = pjsip_rdata_get_sdp_info(rdata);
    if (!sdp_info || !sdp_info->sdp) {
	pj_str_t reason = pj_str("Require valid offer");
	pjsip_endpt_respond_stateless( app.sip_endpt, rdata,
				       400, &reason,
				       NULL, NULL);
    }

    for (i=0; i<MAX_CALLS; ++i) {
	if (app.call[i].inv == NULL) {
	    call = &app.call[i];
	    break;
	}
    }

    if (i==MAX_CALLS) {
	pj_str_t reason = pj_str("We're full");
	pjsip_endpt_respond_stateless( app.sip_endpt, rdata,
				       PJSIP_SC_BUSY_HERE, &reason,
				       NULL, NULL);
	return PJ_TRUE;
    }

    /* Generate Contact URI */
    status = pj_gethostip(sip_af, &hostaddr);
    if (status != PJ_SUCCESS) {
	app_perror(THIS_FILE, "Unable to retrieve local host IP", status);
	return PJ_TRUE;
    }
    pj_sockaddr_print(&hostaddr, hostip, sizeof(hostip), 2);
    pj_ansi_sprintf(temp, "<sip:[email protected]%s:%d>", hostip, sip_port);
    local_uri = pj_str(temp);

    status = pjsip_dlg_create_uas( pjsip_ua_instance(), rdata,
				   &local_uri, &dlg);

    if (status == PJ_SUCCESS)
	answer = create_answer((int)(call-app.call), dlg->pool, sdp_info->sdp);
    if (status == PJ_SUCCESS)
    	status = pjsip_inv_create_uas( dlg, rdata, answer, 0, &call->inv);
    if (status == PJ_SUCCESS)
    	status = pjsip_inv_initial_answer(call->inv, rdata, 100,
				          NULL, NULL, &tdata);
    if (status == PJ_SUCCESS)
    	status = pjsip_inv_send_msg(call->inv, tdata);

    if (status == PJ_SUCCESS)
//.........这里部分代码省略.........

/*
 * pjmedia_audiodev_strerror()
 */
PJ_DEF(pj_str_t) pjmedia_audiodev_strerror(pj_status_t statcode, 
					   char *buf, pj_size_t bufsize )
{
    pj_str_t errstr;

#if defined(PJ_HAS_ERROR_STRING) && (PJ_HAS_ERROR_STRING != 0)


    /* See if the error comes from Core Audio. */
#if PJMEDIA_AUDIO_DEV_HAS_COREAUDIO
    if (statcode >= PJMEDIA_AUDIODEV_COREAUDIO_ERRNO_START &&
	statcode <= PJMEDIA_AUDIODEV_COREAUDIO_ERRNO_END)
    {
	int ca_err = PJMEDIA_AUDIODEV_COREAUDIO_ERRNO_START - statcode;

	PJ_UNUSED_ARG(ca_err);
	// TODO: create more helpful error messages
	errstr.ptr = buf;
	pj_strcpy2(&errstr, "Core audio error");
	return errstr;
    } else
#endif

    /* See if the error comes from PortAudio. */
#if PJMEDIA_AUDIO_DEV_HAS_PORTAUDIO
    if (statcode >= PJMEDIA_AUDIODEV_PORTAUDIO_ERRNO_START &&
	statcode <= PJMEDIA_AUDIODEV_PORTAUDIO_ERRNO_END)
    {

	//int pa_err = statcode - PJMEDIA_ERRNO_FROM_PORTAUDIO(0);
	int pa_err = PJMEDIA_AUDIODEV_PORTAUDIO_ERRNO_START - statcode;
	pj_str_t msg;
	
	msg.ptr = (char*)Pa_GetErrorText(pa_err);
	msg.slen = pj_ansi_strlen(msg.ptr);

	errstr.ptr = buf;
	pj_strncpy_with_null(&errstr, &msg, bufsize);
	return errstr;

    } else 
#endif	/* PJMEDIA_SOUND_IMPLEMENTATION */

    /* See if the error comes from WMME */
#if PJMEDIA_AUDIO_DEV_HAS_WMME
    if ((statcode >= PJMEDIA_AUDIODEV_WMME_IN_ERROR_START &&
	 statcode < PJMEDIA_AUDIODEV_WMME_IN_ERROR_END) ||
	(statcode >= PJMEDIA_AUDIODEV_WMME_OUT_ERROR_START &&
	 statcode < PJMEDIA_AUDIODEV_WMME_OUT_ERROR_END))
    {
	MMRESULT native_err, mr;
	MMRESULT (WINAPI *waveGetErrText)(UINT mmrError, LPTSTR pszText, UINT cchText);
	PJ_DECL_UNICODE_TEMP_BUF(wbuf, 80)

	if (statcode >= PJMEDIA_AUDIODEV_WMME_IN_ERROR_START &&
	    statcode <= PJMEDIA_AUDIODEV_WMME_IN_ERROR_END)
	{
	    native_err = statcode - PJMEDIA_AUDIODEV_WMME_IN_ERROR_START;
	    waveGetErrText = &waveInGetErrorText;
	} else {
	    native_err = statcode - PJMEDIA_AUDIODEV_WMME_OUT_ERROR_START;
	    waveGetErrText = &waveOutGetErrorText;
	}

#if PJ_NATIVE_STRING_IS_UNICODE
	mr = (*waveGetErrText)(native_err, wbuf, PJ_ARRAY_SIZE(wbuf));
	if (mr == MMSYSERR_NOERROR) {
	    int len = wcslen(wbuf);
	    pj_unicode_to_ansi(wbuf, len, buf, bufsize);
	}
#else
	mr = (*waveGetErrText)(native_err, buf, bufsize);
#endif

	if (mr==MMSYSERR_NOERROR) {
	    errstr.ptr = buf;
	    errstr.slen = pj_ansi_strlen(buf);
	    return errstr;
	} else {
	    pj_ansi_snprintf(buf, bufsize, "MMSYSTEM native error %d", 
			     native_err);
	    return pj_str(buf);
	}

    } else

/*
 * Handler to receive incoming MESSAGE
 */
static pj_bool_t im_on_rx_request(pjsip_rx_data *rdata)
{
    pj_str_t from, to;
    pjsip_accept_hdr *accept_hdr;
    pjsip_msg *msg;

    msg = rdata->msg_info.msg;

    /* Only want to handle MESSAGE requests. */
    if (pjsip_method_cmp(&msg->line.req.method, &pjsip_message_method) != 0) {
	return PJ_FALSE;
    }


    /* Should not have any transaction attached to rdata. */
    PJ_ASSERT_RETURN(pjsip_rdata_get_tsx(rdata)==NULL, PJ_FALSE);

    /* Should not have any dialog attached to rdata. */
    PJ_ASSERT_RETURN(pjsip_rdata_get_dlg(rdata)==NULL, PJ_FALSE);

    /* Check if we can accept the message. */
    if (!pjsua_im_accept_pager(rdata, &accept_hdr)) {
	pjsip_hdr hdr_list;

	pj_list_init(&hdr_list);
	pj_list_push_back(&hdr_list, accept_hdr);

	pjsip_endpt_respond_stateless(pjsua_var.endpt, rdata, 
				      PJSIP_SC_NOT_ACCEPTABLE_HERE, NULL, 
				      &hdr_list, NULL);
	return PJ_TRUE;
    }
    
    /* Respond with 200 first, so that remote doesn't retransmit in case
     * the UI takes too long to process the message. 
     */
    pjsip_endpt_respond( pjsua_var.endpt, NULL, rdata, 200, NULL,
			 NULL, NULL, NULL);

    /* For the source URI, we use Contact header if present, since
     * Contact header contains the port number information. If this is
     * not available, then use From header.
     */
    from.ptr = (char*)pj_pool_alloc(rdata->tp_info.pool, PJSIP_MAX_URL_SIZE);
    from.slen = pjsip_uri_print(PJSIP_URI_IN_FROMTO_HDR, 
				rdata->msg_info.from->uri,
				from.ptr, PJSIP_MAX_URL_SIZE);

    if (from.slen < 1)
	from = pj_str("<--URI is too long-->");

    /* Build the To text. */
    to.ptr = (char*) pj_pool_alloc(rdata->tp_info.pool, PJSIP_MAX_URL_SIZE);
    to.slen = pjsip_uri_print( PJSIP_URI_IN_FROMTO_HDR, 
			       rdata->msg_info.to->uri,
			       to.ptr, PJSIP_MAX_URL_SIZE);
    if (to.slen < 1)
	to = pj_str("<--URI is too long-->");

    /* Process pager. */
    pjsua_im_process_pager(-1, &from, &to, rdata);

    /* Done. */
    return PJ_TRUE;
}