Last updated: by mlym@calltower.com
Overview
This article will go over and explain the SIP Signaling basics using VoIP Monitor.
Sip Signaling Basics:
In a call flow you have your basic sip signaling. Shown below:
INVITE: This is what initiates the call set up.
100 TRYING: This is the receiving end searching for the user/number.
180/183: This is the receiving end establishing a connection and sending ringing.
200 OK: This is the receiving end picking up the call and choosing which codecs and audio ports to use on the call.
ACK: this is the originating end agreeing to the 200 ok response and completing SDP setup.
RTP: When you see RTP this is the Audio on the call, you want to see this is both directions like shown below.
