Unanswered calls will not forward to voicemail - Error 603 Declined


I have a GXV3240 phone. When calling the phone it rings about 10 times and rather than transferring to voicemail it plays a message Error 603 declined. The phone server is a UCM6208. Other phones are working properly. Why is this one failing to transfer to voicemail?




Could you confirm there is no forwarding setup on the extension on the UCM?

Sounds like you might have “call forwarding no answer” configured going somewhere your not intending.


What is the firmware version on the UCM? I had a similar issue on older firmware.