I have MPLS IP VPN network and I'm configuring VoIP service using Cisco2801 and Siemens PBXs. Basic configuration is ok, i can establish VoIP calls. I have problems with cRTP and sRTP.
When I configure cRTP or sRTP signalization is going on, telephone rings but there is no audio when I hang up.
I'm configuring cRTP on access link PE-CE, and sRTP between H.323 gateways.
I will be very grateful if somebody shares experience regarding these issues.