I would try removing this line from the Ports that connect to IP Phones;
switchport trunk encapsulation dot1q
It is unnecessary to configure the switchport in Trunk mode because when you use the Voice VLAN (with a native vlan) command a "special" dot1q trunk is automatically setup. The reasons I have seen to support this setup are many and vary from minimizing Trunking overhead to ease of configuration and everything in between :) On the older 3500XL Switches the Trunk method was the only way to go, but on all newer versions the need for Sitchport mode Trunk is not necessary. Here is one of the better threads I have ever read on this issue (with some Tac links as well). There are some great answers from Mahesh,Paolo Sankar and others here.
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...