Constant RingBack heard with calls over PSTN SIP are XFERed from UC

Answered Question

   I have a CUCM 7.1(3) and Unity Connection 7 deployment with two PSTN connections, 1 SIP and 1 PRI. When calls come in over SIP to an AA, and someone selects an option to XFER to a CUCM Hunt Pilot, the caller on the PSTN hears constant RingBack. The phone(s) in the Hunt Pilot's LG ring normally and all other call processing appears normal. If I call a DID on the PRI which is pointed to the same AA, and XFER to the same Hunt Pilot, Ring back is normal. Normal rining is also heard when I call the AA from the inside and Xfer.

   Also, If I change the UC AutoAttendants XFER to Supervised Transfer, the caller on the PSTN hears one ring back and then silence.

Any ideas? It does seem SIP related.


I have this problem too.
0 votes
Correct Answer by Joseph Martini about 6 years 1 month ago

Found exactly like: this only happens with blind transferes not supervised as you've already seen.

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Overall Rating: 5 (1 ratings)


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