We have a customer who uses a SIP trunk for PSTN connectivity with a Cisco Voice Gateway.
IP Phone -----> CUCM ---SIPTrunk--> CUBE ---SIPTrunk---> PSTN Provider
There's a issue where organization cannot make more than 3 concurrent outgoing calls. SIP Trunk has 30 Sessions allowed from Service Provider Side. It was working without an issue for more than one year and suddenly this issue came up. When I looked into gateway SIP traces, I noticed following;
PSTN Provider states they don't receive a RTP port in initial invite so they reject it from their side. We did not make any recent changes also. Can any one advice on this ? For first 3 calls everything works fine, from 4th call onwards, call is rejected. Please advice.
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