I`ve got a CUCM 9.1.2 connected via SIP Trunk to two other PBX.
When I have a call between two CUCM Phones (eg. DN 2001 calls 2002) and I start a transfer from DN 2002 to 5001 (on 3rd Party PBX) the number (and name) 2002 is signalled on called phone. So far, so good, but when I then press the transfer button the calling party number 2002 is not updated on the called phone display. It seems, that the information does not come through the SIP Trunk.
Any idea how I can change that.