After days of packet sniffing and trial and error, I was finally able to get the freeware X-Lite SIP Softphone fully functional as a user endpoint on my Nortel CS1000M v4.5.
There are too many details to post in a single article, but if anyone has been playing with this and can't quite figure it out, I can most likely help with your problem.
There are too many details to post in a single article, but if anyone has been playing with this and can't quite figure it out, I can most likely help with your problem.