How does SIP work?

Hi

I finally got to have a working set up using an Axon Windows PBX
software, Linksys 3102 gateway, a GrandStream IP phone and an X-Ten
softphone over the Net... but I don't know _why_ it works :-)

Here's how I think the whole thing works:

1. I set up the router to map UDP 5060 to the host where the PBX is
installed, and I launch the Axon server

2. Remote phones connect through the Net into ..
Telecom, Cabling and VoIP continues...
Tags: telecommunications Cisco Internet Broadband cat6