[cisco-voip] Off net to off net transfer using Verizon SIP Trunk

[Nick]

Hi All

I have an issue when trying to complete an off net to off net transfer for
calls using Verizon SIP trunking, the call arrives on the SIP and then gets
transfered back out of the SIP to an external destination, I get the
message cannot complete transfer on the phone and the transfered part of
the call fails but the original call stays on hold.

I have got the Block offnet to offnet transfer set to False on the CUCM, so
I think this is definitely the SIP trunks thats denying the call. Does
anyone know which part of the SIP header may need manipulating for
transfered calls, or anyne come across this scenario before?

Regards

Nick
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