[asterisk-users] Asterisk && RTCP

[Kevin P. Fleming]

On 02/16/2012 01:16 AM, Sammy Govind wrote:
> Hello list,
>
> I need to know about Asterisk's friendly nature with RTCP. I've phones
> which support RTCP and they connect to the outer world via multiple
> carriers. In one of my recent packet traces I've observed that the
> caller initiated a call with rtcp string in SDP while for the same
> call dialling our from Asterisk to the carrier has no RTCP string in SDP !
> Can anyone please tell why is this so! or if there is anything I can do
> to make RTCPs flow through the asterisk server !
> I've asterisk 1.6.2.20 in production.

It is not mandatory to signal anything related to RTCP in the SDP. RTCP 
is implicitly handled on the next port up from the port being used for 
RTP; the signaling in SDP is only needed if the RTCP is *not* going to 
be on the next port up.

RTCP will never *flow through* Asterisk, as Asterisk is terminating both 
RTP flows and thus is an endpoint for both of them.

Do you have an actual problem you are trying to resolve, or are you just 
asking questions about RTCP?

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at www.digium.com & www.asterisk.org