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 WaitingFor200OkWithMediaOffer::ProvisionalResponse( DialogTracker& impl, SipMessage& response, const char* address, int port ) const
{
if( response.getResponseStatusCode() != SIP_TRYING_CODE )
{
// RFC requires that all SDP previews be identical. In ensure that this
// requirement is met, we apply the saved copy of the patched SDP preview
// to the response.
if( response.hasSdpBody() )
{
impl.applyPatchedSdpPreview( response );
}
// we are receiving a provisional response - check if it is sent reliably...
if( response.getHeaderValue( 0, SIP_RSEQ_FIELD ) )
{
// Presence of RSeq: header in the message indicates that it is sent reliably
ChangeState( impl, impl.pWaitingForPrackWithMediaAnswer );
}
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();
}
}
void TimeBoundState::DoEntryAction( DialogTracker& impl ) const
{
impl.resetTimerTickCounter();
}