If you’re considering switching your old ISDN phone system to a SIP (Session Initiation Protocol for those that wonder what the hell it means, and are still no wiser) I couldn’t recommend it highly enough! Essentially if you are already using ISDN for your phone lines, your calls are already running over a data line. Switching to SIP means that instead your calls run over an existing or new MIA

If you need to customise your Polycom phone interface, in this case a Polycom IP450, on an Asterisk based Kerio operator SIP phone system, the following may help with Polycom soft key configuration and Polycom BLF configuration. In Kerio Operator, the following should be inserted within the tags, within the main template override file: