Hello all, 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?) Regards Tarun Gupta _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
