I have been using FreePBX 184.108.40.206 for a long time and all office extensions configured with “11x” or “10x” have been working fine on all SIP phones. Recently we got this msg error: “Your call can not be completed at this dial…”. on some phones when we dialed or transferred the call to these extensions, but it did work in some other phones. Reboot the trouble phones does not help.
I couldn’t find any documents related to this. Can someone help me?
Thanks very much.