Hello all For a SIP AUTOMATIC ATTENDANT service there’s an AUDIO defect when the Calling Party is a PLMN/PSTN user. The MGC invokes, via other nodes, the Service on AS. The Service sends an INVITE to the MRF to play an announcement and collect one digit. After collecting the digit the dialog to the MRF is closed with BYE-OK. After this, signaling for the incoming leg is suspended for 6 seconds. During these 6 seconds the Service sends an INVITE to create the 2’ leg according to the selected attendant who will reply automatically 6 seconds later (200 OK). After that, the new leg will be connected to the incoming leg. The calling user hears the new announcement . The problem is that, during these 6 seconds between the 1’ and 2’ announcement, the PLMN/PSTN calling user hears a “strange noise” (this noise is considerably reduced if the calling party itself deactivates the microphone….; A sort of echo, maybe?) I am wondering if after the BYE-OK with MRF, the service should somehow inform the MGC that the 1’ announcement has been completed. Six seconds of silence is the expected behavior. Something to make the speech path properly work during this phase. I read something about SDP re-negotiation and “SIP 183 Session In Progress” usage but cannot really find what I’m looking for. Thank you for your kind attention !!!
Regards Marco _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
