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CUCM 8.6.2.20000-2, SIP Trunk, and E1 with PBX: call transfers and call forwards with wrong displayed numbers

Hello,


we have a CUCM 8.6.2.20000-2, and we have configured a SIP Trunk with a Cisco Router, which is connected to a PBX by an E1.


We have this issue: when we make call transfers or call forwards from CUCM to PBX and vice versa, wrong numbers are displayed on the phones.

For example, if a PBX phone calls a first CUCM phone, and this one transfers the call to a second CUCM phone, the first CUCM phone number is displayed on the secon CUCM phone.

We have similar issues for forwarded calls.


What's wrong?


TIA and regards.

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