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Incoming Call Forward to PSTN for the calls originating from PSTN

Halsser
Level 1
Level 1

I have an issue with calls originating from PSTN and redirecting back to PSTN. That mean when I have incoming call from PSTN, and I have the call forward to PSTN mobile number on my extension the call does not go through but get disconnected.

  • Calls from internal extension get forwarded to PSTN.
  • outgoing /incoming calls working properly without forward to PSTN.
  • calls originating from PSTN and forwarded to internal extension works.
  • The call follows: PSTN caller ->E1/PRI ->Voice Gateway ->SIP Trunk -> CUCM->SIP->IP phone
  • I used outgoing translation profile to configure my router to send any number within my subscribed DID range as CALLING NUMBER (CLID)  

I keep getting:

SIP/2.0 480 Temporarily Not Available and cause value=20

I am looking for your assistance with this issue.

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