Do you mean that callers to these extensions go straight to VM without ringing the phones first, or are the phones getting set to call-forward-all to VM 'by themselves'?
Option one could mean that the phones are losing connection across the MPLS and callers to this remote site are transferred directly to VM, since CCM sees the phone as unreg'd.
Option two could mean that users are inadvertently hitting CFwdAll before hitting their messages button.
Or, you could have a database replication issue if you have more than one CM.
Another thing I've seen is a malicious user logging into CCM user pages for fun and setting the CFA through the web. Most people set up their systems with a generic password for users. (I would recommend AD integration where possible.)
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...