3/12/2021 0 Comments Cisco 7911G Sip Firmware Download
I have seen a few people experiment with VoIP phones running over a HSMM-MESH link and thought this could be an interesting experiment.I have been thinking of experimenting with VoIP for a couple of years but never found a good reason to as I use my cellphone for just about everything.
![]() Cursory look on-line seemed that the configuration files were adequately documented so I started off on my journey. I was looking for a entry-level Asterisk server program that I could load on an old laptop for testing. Searching through the Internet, I found Trixbox - which is a self-contained Linux distro with Asterisk and FreePBX already installed. Configuration is done through a web page interface - perfect for a Linux Padawan like myself. Setting Trixbox to talk to my Polycom IP501 phone was extremely easy: went through the extension and phone setup pages and had everything configured in less than an hour thanks to YouTube videos and online tutorials. Same thing with a softphone application on my Ubuntu desktop - Twinkle. SCCP is a proprietary protocol created and defined by Cisco, where SIP is a more open protocol and generally universal from what Ive seen. Since I dont know where this project will go in the long term, Id rather not limit myself to one brand of phone or equipment so I decided to go with SIP. Unfortunately the phones I bought were pulled from a business environment so it had SCCP firmware installed and needed to be changed. It involves having a tftp server on the network that serves the firmware files to the phone upon bootup. After registering for a free account on the Cisco website, I was able to download the SIP9-3-1-1S firmware files and followed the instructions at this link to upgrade 7911 phones to SIP firmware. Cisco 7911G Sip Firmware Password For DebuggingThis file sets things like the time and date format, the IP address of the VoIP server, the username and password for debugging and registration, etc. Boy, was I wrong. Trixbox apparently has limited support for Cisco phones and does not have a default configuration for the 7911G phones. Off to the Internet I went, hoping I could find a valid configuration file that someone had posted but came up empty handed. I found a lot of forum posts that were similar to my situation but none of the configuration files worked. Go through the Cisco Phone setup, make an extension as usual and a 7940 phone. Make sure on the Trixbox extensions to change natno and qualifynever -- somehow this was restricting the registration process and not allowing it to complete.
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