Constant RingBack heard with calls over PSTN SIP are XFERed from UC
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.
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...