C++ DialogTracker::ProcessMediaAnswer方法代码示例

void WaitingFor200OkforInvite::SuccessfulResponse( DialogTracker& impl, SipMessage& response, const char* address, int port ) const
{
   int seqNum;
   UtlString seqMethod;
   
   if( response.getCSeqField( &seqNum, &seqMethod ) )
   {
      if( seqMethod.compareTo( SIP_INVITE_METHOD ) == 0 )
      {
         // normally we would not be expecting this 200 OK response to carry
         // an SDP however we have encountered in the field some endpoints
         // that repeat the SDP answer they already sent in a previous
         // reliable provisional response (see XECS-2079 for the details).
         // Given that, if an SDP answer is found, we will reprocess it
         // to make sure it gets the same transformations that the initial
         // one got as per XECS-2089.
         if( response.hasSdpBody() )
         {
            impl.ProcessMediaAnswer( response, INITIAL_OFFER_ANSWER );
         }
         ChangeState( impl, impl.pWaitingForAckForInvite );
      }
      else
      {
         OsSysLog::add(FAC_NAT,PRI_DEBUG,"'%s:%s' - Received unexpected successful response for %s request",
               impl.name(), impl.GetCurrentState()->name(), seqMethod.data() );    
      }
   }   
}

void WaitingForMediaAnswer::ProvisionalResponse( DialogTracker& impl, SipMessage& response, const char* address, int port ) const
{
   if( response.getResponseStatusCode() != SIP_TRYING_CODE )
   {
      if( response.hasSdpBody() )
      {
         // Both reliable and unreliable provisional responses can carry SDP bodies.  According to 
         // draft-ietf-sipping-sip-offeranswer-04.txt section 3.1, unreliable provisional responses
         // carrying an answer is a mere previes of what the 'real' SDP answer will be and that it
         // must be identical to it.  Since we may be changing the SDP of the 'real' answer to compensate
         // for NATs we need to also manipulate the 'preview' answer to make match the requirement that
         // the preview and 'real' answers be identical.
   
         // we are receiving a provisional response - check if it is sent reliably...
         impl.ProcessMediaAnswer( response, INITIAL_OFFER_ANSWER );
         if( response.getHeaderValue( 0, SIP_RSEQ_FIELD ) )
         {
            // Presence of RSeq: header in the message indicates that it is sent reliably
            ChangeState( impl, impl.pWaitingForPrack );
         }
         else
         {
            // We have received an unreliable provisional response - although that does
            // not cause a state machine state change, we need to reset the tick counter
            // to show that there is still activity in this dialog.
            impl.resetTimerTickCounter();            
         }
      }
   }
}

void ProcessingPrack::SuccessfulResponse( DialogTracker& impl, SipMessage& response, const char* address, int port ) const
{
   int seqNum;
   UtlString seqMethod;

   if( response.getCSeqField( &seqNum, &seqMethod ) )
   {
      if( seqMethod.compareTo( SIP_INVITE_METHOD ) == 0 )
      {
         // normally we would not be expecting this 200 OK response to carry
         // an SDP in this state however we have encountered in the field some endpoints
         // that repeat the SDP answer they already sent in a previous
         // Successful response (see XECS-2079 for the details).
         // Given that, if an SDP answer is found, we will reprocess it
         // to make sure it gets the same transformations that the initial
         // one got as per XECS-2089.
         if( response.hasSdpBody() )
         {
            impl.ProcessMediaAnswer( response, INITIAL_OFFER_ANSWER );
         }
      }
      else
      {
         OsSysLog::add(FAC_NAT,PRI_DEBUG,"'%s:%s' - Received unexpected Successful Response for %s request",
               impl.name(), impl.GetCurrentState()->name(), seqMethod.data() );
      }
      // We have received a response - although that does
      // not cause a state machine state change, we need to reset the tick counter
      // to show that there is still activity in this dialog.
      impl.resetTimerTickCounter();
   }
}

bool WaitingForAckWithAnswerForInvite::AckRequest( DialogTracker& impl, SipMessage& request, TransactionDirectionality direction, const char* address, int port ) const
{
   impl.ProcessMediaAnswer( request, INITIAL_OFFER_ANSWER );
   impl.setDialogEstablishedFlag();
   impl.promoteTentativeMediaRelaySessionsToCurrent();
   ChangeState( impl, impl.pWaitingForInvite );
   return false;
}

void WaitingForMediaAnswer::SuccessfulResponse( DialogTracker& impl, SipMessage& response, const char* address, int port ) const
{
   int seqNum;
   UtlString seqMethod;
   
   if( response.getCSeqField( &seqNum, &seqMethod ) )
   {
      if( seqMethod.compareTo( SIP_INVITE_METHOD ) == 0 )
      {
         impl.ProcessMediaAnswer( response, INITIAL_OFFER_ANSWER );
         ChangeState( impl, impl.pWaitingForAckForInvite );
      }
   }
}

void WaitingFor200OkWithAnswerForPrack::SuccessfulResponse( DialogTracker& impl, SipMessage& response, const char* address, int port ) const
{
   int seqNum;
   UtlString seqMethod;

   if( response.getCSeqField( &seqNum, &seqMethod ) )
   {
      if( seqMethod.compareTo( SIP_PRACK_METHOD ) == 0 )
      {
         impl.ProcessMediaAnswer( response, NON_INITIAL_OFFER_ANSWER );
         impl.modifyNonIntialOfferAnswerExchangeDoneFlag( true );
         ChangeState( impl, impl.pProcessingPrackWaitingForAckforInvite );
      }
      else
      {
         // Not interesting for us but our parent class provides some handling for
         // other successful responses.
         ProcessingPrack::SuccessfulResponse( impl, response, address, port );
      }
   }
}

bool WaitingForPrackWithMediaAnswer::PrackRequest( DialogTracker& impl, SipMessage& request, TransactionDirectionality direction, const char* address, int port ) const
{
   impl.ProcessMediaAnswer( request, INITIAL_OFFER_ANSWER );
   ChangeState( impl, impl.pWaitingFor200OkForSlowStartPrack );
   return true;
}