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Unity-CUCM shows unknown number on IP phone,plz help

Dear all,

when pstn calls the unity connection and place internal extension or press Zero or operator answers then transfer to internal extension, the ip phones shows the caller id From O (Unknown Number).

In the service parameter i change the below to True, but still the issue exists.

"Display Original Calling Number on Transfer from Cisco Unity"

Please help to solve my issue.

regards,

1 Reply 1

dear all,
am using cucm ver 11.5 with MGCP fxo ports with the following commands.
call comes from pstn-unity connection-welcome message-operator or internal extension
voice-port 0/0/0
supervisory disconnect dualtone mid-call
 no battery-reversal
 cptone SA
 timeouts call-disconnect 1
 timeouts wait-release 1
 connection plar opx immediate 2999
 impedance complex2
 timing hookflash-out 50
 timing guard-out 1000
 caller-id enable
!
please help to solve my caller id issue