The Thing With CUCM Device Packs
To add a new phone on CUCM, whether it is a Cisco phone or one of the free softphones on the Internet, you go to Device –> phone. Sometimes the phone you want to add does not exist in the drop box, because the device model is new or the CUCM version is a bit old. What you can do here is to download a Device Pack of the new phone and install it. A Device Pack is a set of firmwares contained in a single file. Generally, it has the extension “sgn”. A Device Pack for phone X not only contains a load for it, but also loads for many other phone models. This is important to know because, once you install a Device Pack in CUCM, your existing phones by default will install the new version of their respective loads. I encountered a case where, after installing a Device Pack, some phones no longer worked. So I had to note down the “Active Load” and put it in the Device Defaults page. CUCM Device Pack download To download a Device Pack, you need to have a valid Cis...
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