[SIPForum-discussion] RTP event and Marker Bit

Garron, James jgarron at sonusnet.com
Thu Oct 11 17:11:40 UTC 2012

For DTMF there would be a change in payload type, so this would still apply correct.

From: Abhisek Acharya [mailto:abhisek.acharya at gmail.com]
Sent: Thursday, October 11, 2012 5:31 AM
To: Garron, James
Cc: Raghul Prasanna; discussion at sipforum.org
Subject: Re: [SIPForum-discussion] RTP event and Marker Bit

Well Garron,

This is situational. Marker bit can also be set to true when DTMF is started.Also let us assume during RTP flow there are flow of CNG packet flow.Marker bit will mark the start of real RTP packet once CNG stops.

Abhisek Acharya
On Wed, Oct 10, 2012 at 12:59 AM, Garron, James <jgarron at sonusnet.com<mailto:jgarron at sonusnet.com>> wrote:
The marker bit should be set to 1 for the first RTP event and 0 for all subsequent packets of that RTP event.

From: discussion-bounces at sipforum.org<mailto:discussion-bounces at sipforum.org> [mailto:discussion-bounces at sipforum.org<mailto:discussion-bounces at sipforum.org>] On Behalf Of Raghul Prasanna
Sent: Tuesday, October 09, 2012 7:03 AM
To: discussion at sipforum.org<mailto:discussion at sipforum.org>
Subject: [SIPForum-discussion] RTP event and Marker Bit

HI All,

I understand that Marker Bit in RTP when set to True indicates a New Event.

In case of RTPevent packets, my understanding is the Mark bit should be set to True only upon a detection of new DTMF.

It cant be set to True on the RTPevent packets for the same DTMF, is that right?


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