You can downgrade the firmware, just not to an unsigned load. You can downgrade the firmware on a single phone by populating the Phone Load Name field in phone configuration or you can downgrade all phones of a given type by changing the Load Information field for that phone type in Device Defaults.
Please allow me to interrupt you here, i got a question.
After upgrading my Cisco 7912 IP Phones, arround 5 IP Phones get to a state where the LCD blanked out, and the hold and config lights where steady red/green. Are the Phones dead ? What happened and what is the solution ???
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...