CAF: Leg Creation Samples

Creating a Standalone Outgoing Call Leg

   PTRCTBCMC_CALL_LEG_ATTRIBUTE ptrOutgoingLegAttribute;
   ptrOutgoingLegAttribute = tbnew CTBCMC_CALL_LEG_ATTRIBUTE();
 
   ptrOutgoingLegAttribute->GetCalledNumber()         = "123-4567";
   ptrOutgoingLegAttribute->GetCallingNumber()        = "987-6543";
   ptrOutgoingLegAttribute->GetNetworkAccessPoint()   = "NAP_SS7_MONTREAL";
 
   PCTBCMCLeg pCallLeg = tbnew CTBCMCLeg( ++mun32LegId, ptrOutgoingLegAttribute, this, 0, &mLegMutex );
   pCallLeg->CreateCall();

Bridging an Incoming Call Leg (manual method)

 TBX_VOID CTBCAFMediaGateway::OnCallLegPresent
 (
   IN	TBCMC_LEG_ID				in_LegId,
   IN	CTBCMC_CALL_LEG_ATTRIBUTE_COMMON &	in_CallLegAttribute,
   IN	CTBCMC_PROTOCOL_ATTRIBUTE &		in_ProtocolAttribute
 )
 {
 TBCAF_MUTEX_GET_SCOPE_BEGIN( &mMutex )
        PCTBCMC_CALL_LEG_ATTRIBUTE	pCallLegAttribute;
        PTRCTBCMC_CALL_LEG_ATTRIBUTE	ptrIncomingCallLegAttribute;
        PTRCTBCMC_CALL_LEG_ATTRIBUTE    ptrOutgoingCallLegAttribute;
 	/*---------------------------------------------------------------------------------------------------------------------------
 	 |  Code section
 	 *--------------------------------------------------------------------------------------------------------------------------*/
 	CAFCODE( CTBCAFMediaGateway::OnCallLegPresent )
 	{
               pCallLegAttribute           = in_CallLegAttribute.GetCallLegAttribute();
               ptrIncomingCallLegAttribute = tbnew CTBCMC_CALL_LEG_ATTRIBUTE(*pCallLegAttribute);
               ptrOutgoingCallLegAttribute = tbnew CTBCMC_CALL_LEG_ATTRIBUTE();
 
               ptrOutgoingCallLegAttribute->GetCalledNumber()         = ptrIncomingCallLegAttribute->GetCallingNumber();
               ptrOutgoingCallLegAttribute->GetCallingNumber()        = ptrIncomingCallLegAttribute->GetCalledNumber();
               ptrOutgoingCallLegAttribute->GetNetworkAccessPoint()   = ptrIncomingCallLegAttribute->GetNetworkAccessPoint();
   
               PCTBCMCLeg pIncomingCallLeg = tbnew CTBCMCLeg( ++mun32LegId, ptrIncomingCallLegAttribute, this, 0, &mLegMutex );
               pIncomingCallLeg->CreateCall();
   
               PCTBCMCLeg pOutgoingCallLeg = tbnew CTBCMCLeg( ++mun32LegId, ptrOutgoingCallLegAttribute, this, 0, &mLegMutex );
               pOutgoingCallLeg->CreateCall();
   
 	       TBX_EXIT_SUCCESS( TBX_RESULT_OK );
 	}
 
 	/*---------------------------------------------------------------------------------------------------------------------------
 	 |  Exception handling section
 	 *--------------------------------------------------------------------------------------------------------------------------*/
 	CAF_EXCEPTION_HANDLING
 
 	/*---------------------------------------------------------------------------------------------------------------------------
 	 |  Error handling section
 	 *--------------------------------------------------------------------------------------------------------------------------*/
 	CAF_ERROR_HANDLING( CAF_VERBOSE )
 	{
 	}
 
 	/*---------------------------------------------------------------------------------------------------------------------------
 	 |  Cleanup section
 	 *--------------------------------------------------------------------------------------------------------------------------*/
 	CAF_CLEANUP
 	{
 	}
 
 	RETURN_VOID;
 TBCAF_MUTEX_GET_SCOPE_END( &mMutex )
 }

Incoming and outgoing call leg will be joined when we receive the notification OnCallLegAnswered() indicating that the outgoing call has been answered by the remote peer.

Bridging an Incoming Call Leg (using CTBCAFBridge )

 TBX_VOID CTBCAFMediaGateway::OnCallLegPresent
 (
   IN	TBCMC_LEG_ID				in_LegId,
   IN	CTBCMC_CALL_LEG_ATTRIBUTE_COMMON &	in_CallLegAttribute,
   IN	CTBCMC_PROTOCOL_ATTRIBUTE &		in_ProtocolAttribute
 )
 {
 TBCAF_MUTEX_GET_SCOPE_BEGIN( &mMutex )
        PCTBCMC_CALL_LEG_ATTRIBUTE	pCallLegAttribute;
        PTRCTBCMC_CALL_LEG_ATTRIBUTE	ptrIncomingCallLegAttribute;
        PTRCTBCMC_CALL_LEG_ATTRIBUTE    ptrOutgoingCallLegAttribute;
        PITBCAFCallFlow                 pCallFlow;
        TBX_RESULT                      Result;
 	/*---------------------------------------------------------------------------------------------------------------------------
 	 |  Code section
 	 *--------------------------------------------------------------------------------------------------------------------------*/
 	CAFCODE( CTBCAFMediaGateway::OnCallLegPresent )
 	{
               pCallLegAttribute           = in_CallLegAttribute.GetCallLegAttribute();
               ptrIncomingCallLegAttribute = tbnew CTBCMC_CALL_LEG_ATTRIBUTE(*pCallLegAttribute);
               ptrOutgoingCallLegAttribute = tbnew CTBCMC_CALL_LEG_ATTRIBUTE();
 
               ptrOutgoingCallLegAttribute->GetCalledNumber()         = ptrIncomingCallLegAttribute->GetCallingNumber();
               ptrOutgoingCallLegAttribute->GetCallingNumber()        = ptrIncomingCallLegAttribute->GetCalledNumber();
               ptrOutgoingCallLegAttribute->GetNetworkAccessPoint()   = ptrIncomingCallLegAttribute->GetNetworkAccessPoint();
 
               pCallFlow = tbnew CTBCAFBridge( mun32AccountId, this );
               TBCAF_EXIT_ON_NULL( pCallFlow, TBX_RESULT_FAIL, "Failed to allocate call." );
 			
               Result = pCallFlow->AddIncoming( mun32LegId, ptrIncomingCallLegAttribute );
               TBCAF_EXIT_ON_ERROR(Result, "AddIncoming Failed." );
 
               Result = pCallFlow->AddOutgoing( ptrOutgoingCallLegAttribute );
               TBCAF_EXIT_ON_ERROR(Result, "AddOutgoing Failed." );
   
               // Start the call
               Result = pCallFlow->InitCall( &pCallFlow );
   
 	       TBX_EXIT_SUCCESS( TBX_RESULT_OK );
 	}
 
 	/*---------------------------------------------------------------------------------------------------------------------------
 	 |  Exception handling section
 	 *--------------------------------------------------------------------------------------------------------------------------*/
 	CAF_EXCEPTION_HANDLING
 
 	/*---------------------------------------------------------------------------------------------------------------------------
 	 |  Error handling section
 	 *--------------------------------------------------------------------------------------------------------------------------*/
 	CAF_ERROR_HANDLING( CAF_VERBOSE )
 	{
 	}
 
 	/*---------------------------------------------------------------------------------------------------------------------------
 	 |  Cleanup section
 	 *--------------------------------------------------------------------------------------------------------------------------*/
 	CAF_CLEANUP
 	{
 	}
 
 	RETURN_VOID;
 TBCAF_MUTEX_GET_SCOPE_END( &mMutex )
 }

InitCall() will create each leg added from AddIncoming() and AddOutgoing() and incoming and outgoing call leg will be joined when we receive the notification OnCallLegAnswered() indicating that the outgoing call has been answered by the remote peer.

Creating a Media-only Leg

If you are using a nap of type NAP_MEDIA_TDM:

   PTRCTBCMC_MEDIA_ONLY_LEG_ATTRIBUTE ptrLegAttribute;
   PTBCMC_MEDIA_DESCRIPTION           pMediaDesc;
 
   ptrLegAttribute = tbnew CTBCMC_MEDIA_ONLY_LEG_ATTRIBUTE();
   pMediaDesc	    = &ptrLegAttribute->GetProfile()->MediaDescription; 

   ptrLegAttribute->GetNetworkAccessPoint()      = "NAP_MEDIA_TDM";
   pMediaDesc->Type                              = TBCMC_MEDIA_TYPE_AUDIO;
   pMediaDesc->Transport                         = TBCMC_MEDIA_TRANSPORT_TDM;
   pMediaDesc->Settings.TdmAudio.Type            = TBCMC_MEDIA_SETTINGS_TYPE_TDM_AUDIO;
   pMediaDesc->Settings.TdmAudio.un8Timeslot     = 5;
   Strncpy
   (
       pMediaDesc->Settings.TdmAudio.szTrunkName, 
       "TRUNK_TORONTO_1", 
       sizeof(pMediaDesc->Settings.TdmAudio.szTrunkName)
   );
 
   PCTBCMCLeg pCallLeg = tbnew CTBCMCLeg( ++mun32LegId, ptrLegAttribute, this, 0, &mLegMutex );
   pCallLeg->CreateCall();

If you are using a nap of type NAP_MEDIA_VOIP:

   TBX_RESULT                         Result;
   TBX_SDP_INFO                       SdpInfo;
   PTRCTBCMC_MEDIA_ONLY_LEG_ATTRIBUTE ptrLegAttribute;
   PTBCMC_MEDIA_DESCRIPTION           pMediaDesc;
 
   ptrLegAttribute = tbnew CTBCMC_MEDIA_ONLY_LEG_ATTRIBUTE();
   pMediaDesc	   = &ptrLegAttribute->GetProfile()->MediaDescription;
 
   ptrLegAttribute->GetNetworkAccessPoint()      = "NAP_MEDIA_VOIP";
   pMediaDesc->Type                              = TBCMC_MEDIA_TYPE_AUDIO;
   pMediaDesc->Transport                         = TBCMC_MEDIA_TRANSPORT_IP;
   pMediaDesc->Settings.PacketAudio.Type         = TBCMC_MEDIA_SETTINGS_TYPE_PACKET_AUDIO;
  
   // Set Local SDP
   Result = BuildSdpInfo("", 0, SdpInfo);                 // No IP specified, Toolpack will choose one
   TBCAF_EXIT_ON_ERROR( Result, "BuildSdpInfo failed." );
   ptrLegAttribute->SetLocalSDP(&SdpInfo);
   
   // Set Peer SDP
   Result = BuildSdpInfo("10.0.0.15", 5000, SdpInfo);     // Using peer IP address and port
   TBCAF_EXIT_ON_ERROR( Result, "BuildSdpInfo failed." );
   ptrLegAttribute->SetPeerSDP(&SdpInfo);
 
   PCTBCMCLeg pCallLeg = tbnew CTBCMCLeg( ++mun32LegId, ptrLegAttribute, this, 0, &mLegMutex );
   pCallLeg->CreateCall();

Note that you have two possibilities to build a TBX_SDP_INFO structure. The first one is like in the example (BuildSdpInfo()) where you can build manually your TBX_SDP_INFO structure and the second one is when you have an sdp info in text format. There is a function that will parse the text and build a TBX_SDP_INFO structure from it.

 TBXMediaLibSdpParse
 (
     IN    PTBX_CHAR                        in_pszSdp,
     OUT   PTBX_SDP_INFO                    out_pSdpInfo,
     IN    TBX_MEDIA_SDP_PARSE_OPTIONS      in_Options
 );

To see how to build a TBX_SDP_INFO structure, refer to Filling an SDP Structure.