bool WaitingForInvite::InviteRequest( DialogTracker& impl, SipMessage& request, TransactionDirectionality direction, const char* address, int port ) const
{
bool bTrackRequestResponse = false;
impl.setTransactionDirectionality( direction );
// check is another sipX is already taking care of NAT traversing this session.
if( !impl.isRequestAlreadyHandledByOther( request ) )
{
bTrackRequestResponse = true;
impl.markRequestAsHandledByUs( request );
// check if the INVITE contains an SDP offer
if( request.hasSdpBody() )
{
// request contains an SDP offer. Check if the SDP or the or the actual
// location of the two endpoints impose the use of a media relay.
if( impl.doesEndpointsLocationImposeMediaRelay() )
{
OsSysLog::add(FAC_NAT,PRI_DEBUG,"'%s:%s' - Media relay required",
impl.name(), impl.GetCurrentState()->name() );
impl.setMediaRelayRequiredFlag();
}
else
{
OsSysLog::add(FAC_NAT,PRI_DEBUG,"'%s:%s' - Media relay not required",
impl.name(), impl.GetCurrentState()->name() );
impl.clearMediaRelayRequiredFlag();
}
impl.ProcessMediaOffer( request, INITIAL_OFFER_ANSWER );
ChangeState( impl, impl.pWaitingForMediaAnswer );
}
else
{
// request does contains an SDP offer. This INVITE may be used to set up a 3PCC
// call. Play it safe and impose the use of a media relay to guarantee speechpath
impl.setMediaRelayRequiredFlag();
ChangeState( impl, impl.pWaitingForMediaOffer );
}
}
else
{
// this particular session is already being handled by another sipX i nthe network.
// That sipX is taking care of overcoming the NATs that separate the endpoints involved
// in that session. There isn't much value we can add here so just bail on tracking that
// session.
ChangeState( impl, impl.pMoribund );
}
return bTrackRequestResponse;
}
bool DialogTrackerState::InviteRequest( DialogTracker& impl, SipMessage& request, TransactionDirectionality direction, const char* address, int port ) const
{
if( !impl.isRequestAlreadyHandledByOther( request ) )
{
impl.markRequestAsHandledByUs( request );
}
if( impl.isARetransmittedRequest( request ) )
{
impl.restoreSdpBodyOfRetransmittedRequest( request );
}
else
{
OsSysLog::add(FAC_NAT,PRI_WARNING,"'%s': Received unexpected event InviteRequest while in state '%s'",
impl.name(), impl.GetCurrentState()->name() );
}
return true;
}