[SR-Users] R: Re: R: Re: RTPPROXY & BRANCH

[Marino Mileti]

Without rtpproxy:

- A offers port a1,a2 (audio video) in INVITE to B,C (in case of no natted
client so no needs of rtpproxy)
- B offers port b1,b2 (183)
- C offers port c1,c2 (182).
- A starts to send  audio/video RTP to B on port b1,b2
- A starts to send audio/video RTP to C on port c1,c2

With rtpproxy:

- A offers port a1,a2 (audio video) in INVITE to Kamailio....
- Kamailio contact rtpproxy because B&C are natted clients
- rtpproxy check callid and offer offers port k1,k2....
- Kamailio sends INVITE to B offering k1,k2
- Kamailio sends INVITE to C offering k1,k2
- B offers port b1,b2 (183)
- C offers port c1,c2 (182)
- Kamailio sends 183 to A (for B leg) offering p1,p2
- Kamailio sends 183 to A (for B leg) offering p3,p4
- A starts to stream on p1,p2,p3,p4 but only one receiver can see the video
(B or C depends who will be the first:))

I don't know if it depends on that B & C receives same ports; i don't know
if rtpproxy is able to "duplicate" stream received from A to all "receiver"

-----Messaggio originale-----
Da: sr-users-bounces at lists.sip-router.org
[mailto:sr-users-bounces at lists.sip-router.org] Per conto di Richard Fuchs
Inviato: lunedì 29 settembre 2014 20:31
A: sr-users at lists.sip-router.org
Oggetto: Re: [SR-Users] R: Re: R: Re: RTPPROXY & BRANCH

On 09/29/14 14:23, Marino Mileti wrote:
> The problem isn't on 183s but on the multiple INVITE that Kamailio 
> sends to clients behind rtpengine. Rtpengine open new ports for answer 
> but on INVITE the rtpengine ports are the same...This happens because 
> for all these clients the callid is still the same..so for rtpengine 
> there's no difference...for this reason I can see early media only on 
> one of the receivers

I still don't understand what difference an RTP proxy is supposed to make
for the invite. Your offering client only opens one endpoint and sends that
out. Without RTP proxy, all receiving clients see the same endpoint and they
will all send their early media to that same endpoint.
With RTP proxy, the same thing happens. What's the difference?

cheers

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