7940 w/ 2x 7914 Expansion Modules

[mike144580202]

I have a client who recently I made changes to their phone (7940 w/ 2x 7914 Expansion Modules).  Once I saved the changes and rebooted the phone the expansion modules stopped working and were all lit red.  When checking on the phone it says link type not supported.   I am not sure how in the past they were able to get this module to work with the phone, Cisco says that the configuration is not supported.  Any ideas how I could get this to work? I think that when the phone rebooted it pulled in new firmware or something and reverted settings back to stock.  My guess is someone somehow either flashed a different firmware on the module or phone to make them seem compatible. 

Thanks in advance

[johschaf]

Hello Mike,

I'm not really sure how this ever worked. Please see the following document: http://www.cisco.com/en/US/prod/collateral/voicesw/ps6788/phones/ps379/ps1856/product_data_sheet09186a008008883d.html

The 7940s are not supported with the 7914 sidecars. Supported phones are: 7960G, 7961G, 7970G and 7971G-GE

I'd be doubtful a firmware upgrade caused this issue, unless you did a phone firmware upgrade on the UC. When the phone tries to register with the UC it will have the phone firmware on the UC pushed to it.

In CLI you can add a 7940 with an addon sidecar of 7914, but I didn't have a 7914 to test with. Regardless, I would advise you to purchased a 7960 which would be supported.

Hope this helps.

Thanks,

-john