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.
