There are currently several proposals for setting up and controlling SIP conferences (including back to back client/server...
user agents). All of the current proposals have no effective limit on the number of participants involved. The only practical limit would be in the actual mixing servers. These limits are outside the actual protocol and would be enforced by the conferencing application that is controlling the calls. Commercial SIP/H.323 conferencing solutions realistically support hundreds of users per conferencing session and thousands of simultaneous conferencing sessions. The SIP or H.323 signaling used to set up and control the conference would never impose a limit. It is relevant to note that SIP clients can themselves support three-way conference calls without the need for external hardware.
Dig Deeper on VoIP Protocols
Related Q&A from Bob Thompson
Will vendors really give up proprietary protocols in support of SIP or at least find a way to coexist? Expert Bob Thompson offers his perspective.continue reading
Can you provide some real-world benefits of deploying SIP?continue reading
What does it mean to be truly SIP based?continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.