SIP Trunk - no ringback after transfer from PSTN call
Im hoping someone can help me out here.PSTN callers are not hearing ringback when tranferred to another extension when call is transported to CUCM via SIP trunk to SIP phones.
PSTN -> 3900 SIP SRST Gateway-> SIP Trunk -> CUCM 7.1.5 -> SIP 7945-> No ringback when transferred to another SIP extension on same cluster.
SIP Trunk in CUCM has MRGL that has ANN assigned to it and MTP checked.SIP profile assigned to the trunk has"Disable early media on 180" checked.
After debug ccsip message, it appears that CUCM isn't sending "100 trying" or "180 Ringing" when transfer is initiated and is going straight into "200 OK". Heres the section of the debug during the transfer.
Aug 11 13:09:02: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
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