On Mon, 03 Dec 2012 10:51:21 -0600 Corey Thompson cthompson@eastgrandforks.net wrote:

Can one build custom service monitors in NAV?...Specifically looking for a SIP service monitor...

If you know a little Python you surely can. The wiki has a page on writing them: https://nav.uninett.no/devel:servicemon

I'm not sure what your requirements for monitoring SIP is, but a quick google search for "python session initiation protocol" gives me at least two different Python libraries that might be usable, on the first result page (apparently, there is also a python-sip module which has nothing to do with the Session Initiation Protocol).