I have a UC560 in operation at a remote site and am experiencing difficulty with two functions - one of which is listed in the topic.
The device is using a Telstra SIP trunk, there are no FXO ports in use and no ISDN interface.
Handsets are SPA525G2's.
Inbound and outbound calls work. Call forwarding works internally.
I can set cfwdall on a handset to an external number, and if I call the extension from another internal extension, everything works as expected.
However, if the call to the handset with cfwdall originates from an external number, it is simply dropped.
The debug ccsip message traces tell me that the UC is throwing an error 503, q.850;cause=34, and never attempting to make the outbound call.
Interestingly, it appears to work fine if I transfer an external call to an external number, it just will not function with call forwarding.
This is by far the most critical of the two issues.
When external calls go unanswered or the line is busy, they are simply dropped.
Internally, the forwarding to voicemail works, but if the call originates from outside it does not.
I am hoping this one is part & parcel of the primary issue.
I have been trying to open a support case with the SMB VOIP support team via phone, however I have spent 2.5hrs on hold - the timer is still ticking away as I write this.
The worst thing is that this site is in the outback, over a thousand kilometers from our office. The logistics of just getting here are mind boggling, and prohibitively expensive. At this stage I have two days left and a fair amount of more mundane issues to resolve.