Call Forward on T21P E2 not working

[jolouis]

Taken from your log:

Code:

-- Called SIP/c4_sip-trunk/26008034
[2017-05-19 09:21:17] WARNING[8522][C-00000000]: chan_sip.c:23294 handle_response_invite: Received response: "Forbidden" from '<sip:67557568@xxx.xxx.xxx.xxx>;tag=as4971449e'
  == Everyone is busy/congested at this time (1:0/0/1)
    -- Executing [s@macro-dialout-trunk:23] NoOp("Local/926008034@from-internal-00000000;2", "Dial failed for some reason with DIALSTATUS = CHANUNAVAIL and HANGUPCAUSE = 21") in new stack

That indicates the system tried to dial out to the forwarded number, assuming a prefix of 9 (which the system removed), and the far end repled "Forbidden" and refused the call. So nothing wrong with the phone or the call forward, it's a problem with the PBX not being able to dial the number.