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Re: [Linphone-developers] oRTP - only one of two sessions receiving data

From: John Pallister
Subject: Re: [Linphone-developers] oRTP - only one of two sessions receiving data...
Date: Mon, 18 Apr 2011 13:30:03 +0100

Hi, thanks for your reply.

Since I specifically said "[t]he RTP stream copies have different
source and destination ports" in my post, I have in fact considered
this (and verified it using Wireshark). The source ports are
randomised by default anyway.

The weird thing is that it works sometimes (i.e. both stream copies
are detected) but not others.

I'm going to try mangling the SSRCs and maybe the timestamps of the
stream copies to see if that makes a difference.


John :^P

On Mon, Apr 18, 2011 at 12:20 PM, t <address@hidden> wrote:
> Ya hi,
> Clearly the rtp must use different source ports and the client must
> recognize the source ports as different streams...
> Since you don't mention udp ports, it's a fair assumption that you did not
> consider this.
> Cheers.
> On Sun, Apr 17, 2011 at 8:04 PM, John Pallister <address@hidden>
> wrote:
>> Hello list,
>> I'm really hoping someone can suggest something helpful for me here...
>> My application runs on Windows XP SP3 over an intranet. No DNS, no
>> DHCP, no routing, very simple. It uses oRTP for simple point-to-point
>> routing of G.729-encoded audio; no RTCP, SIP etc. It is compiled with
>> Visual C++ 2008.
>> The scenario: a "router" process sends two simultaneous copies of an
>> RTP stream (received from another process elsewhere on the network) to
>> two separate oRTP sessions in two threads of a client process, to be
>> played out of two different audio devices. The RTP stream copies have
>> different source and destination ports (but are otherwise identical);
>> the destination ports correspond to those of the oRTP sessions.
>> The problem: I expect to receive both stream copies, however either
>> zero, one or two will be received by my application code from oRTP. I
>> can determine no pattern to how many copies will "work". Multiple
>> single streams (i.e. not duplicate streams sent simultaneously) are
>> received correctly and reliably.
>> Does anyone have any experience with this sort of situation (or
>> anything vaguely similar), on Windows or otherwise? Am I being naïve
>> in expecting this to work? Does my router need to do something to the
>> stream copies to enable them to be reliably differentiated and
>> received correctly?
>> Thanks very much,
>> John :^P
>> --
>> John Pallister
>> address@hidden
>> address@hidden
>> _______________________________________________
>> Linphone-developers mailing list
>> address@hidden
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