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CUCM 8.6.2.20000-2, SIP Trunk, and E1 with PBX: issue with calls hanged up by CUCM phone

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 a call between a CUCM phone and a PBX phone, if the CUCM phone hangs up, the call remains active on PBX phone for about 30 seconds, and so a channel on the E1 remains busy; then, the call is terminated and the channel is released.

Instead, if the PBX phone hangs up, everything is OK: the call is immediately terminated.

What's wrong?


TIA and regards.

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