Multi Point Conference - Call Flow

Unanswered Question
Aug 3rd, 2010

Hi All

Wanted to confirm the call flow for multiconferencing video callflow.. Im using polycom devices, though the technology looks the same..

with Point 2 point - we will have a H225/h245 from endpoint (VC terminal) to gatekeeper, and upon negotiation RTP session is established between the endpoints.. right ?

now with multipoint - again there would be h225/245 negotiation from endpoint to gatekeeper.. now with external MCU, there would be another H323 session between gatekeeper and MCU .. upon successful negotiation thro gatekeeper (CMA 5000), the GK forwards request to external MCU (RMX) and then MCU stitches the multipoint calls to a conference.. is that right ?



I have this problem too.
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Joseph Martini Sun, 08/08/2010 - 04:38

That is correct in a point to point phone call the audio stream is  directly between the two phones.  In the multipoint or conference  scenario once the audio streams are setup, each device will transmit  audio to the MCU or conference device, and then the conference device  will duplicate the stream it receives and send it out to all the other  phones.  Basically all audio is sent to the conference device and the  conference device is what everyone listens to (the audio is sourced  from).


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