We have several offices in different states that are using Generic SIP trunk from Simple Signal and when one employee calls the extension (DID) of another employee at a different office, the call does not go to voicemail but instead gets, no mailbox associated with that number message. Same thing happens if they dial the auto attendant and then enter the extension.
Each office has different SIP trunk registrations.
The SIP provider, Simple Signal, is using/passing the g711ulaw codec.
Calls from outside the VOIP network connect to the VM. It's only on interoffice calls thru the SIP/VOIP network that the voicemail does not work.
Attached are the UC540 config, debug of failed transfer to VM, and the debug of cell phone call connecting to VM.
The failed log shows one office (main SIP trunk # XXXXXX6664) trying to call extension 8202 (in another office) which translates to the DID number XXXXXX4211.
The sucessful debug log is from outside the voip network.
Update: I uploaded the old config file. The correct config file has been uploaded with the correct voicemail extension of 8199.
