I have two PRI interfaces against a siemens platform. The gateway is configured with MGCP signaling, when i try to transfer from PSTN - Siemens to Cisco, i lose the call but when i transfer from Cisco to Siemens it works.
First step I'd suggest is to check output of "debug isdn q931" on the voice gateway.
There will be a disconnect code in there.
See what it is and if it makes any sense.
When you say transfer.
Do you mean an actual call transfer?
Cheers,
Tim.
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