Tarun Gupta <tarun.gu...@ericsson.com> writes: > It has been observed whilst testing our WiFi/VoLTE solution that when > a Fixed IMS service (such as Broadband voice or SIP Trunking) CPE > calls one of our WiFi/VoLTE subs, they do not hear any ring back tone > as call setup progresses. It transpires that this is because our VoLTE > UE's always reliably send an SDP in the 183 Session Progress which > means that the Fixed IMS service CPE's sit there waiting for the > remote endpoint to provide early media ring back tone which of course > will never come from the VoLTE UE's. > > Has anyone experienced this in their deployments and if yes, what > solutions were put in place to fix this? (for example network provided > RBT? removing preconditions?)
I would suggest adjusting the VoLTE UE's to not send SDP (establish a session) until they are prepared to send media, either ring-back tone or user media. Otherwise the CPE has to test the provided media to see if it is silent. Dale _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
