[Freeswitch-users] g729 packets skipped in passthrough mode

[Javier Gallart]

Hello,

I've looked deeper into this issue and I might have hit a known problem:

RTP_BUG_IGNORE_MARK_BIT = (1 << 2)

/*
  A Huawei SBC has been discovered that sends the mark bit on every single
RTP packet.
  Since this causes the RTP stack to flush it's buffers, it horribly messes
up the timing on the channel.

  This flag will do nothing when an inbound packet contains the mark bit.

 */

The carrier is actually a Huawei SBC, and the problem I reported only
happens when it sends the marker bit  = true in all the rtp packets. I've
tried
<param name="auto-rtp-bugs" data="RTP_BUG_IGNORE_MARK_BIT"/> in the profile
but the problem is still there, is this the right way to override this
nonsense from the Huawei?

Thanks

Javier

>
> ---------- Forwarded message ----------
> From: Anthony Minessale <anthony.minessale at gmail.com>
> To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
> Date: Tue, 15 Feb 2011 16:38:35 -0600
> Subject: Re: [Freeswitch-users] FreeSWITCH-users Digest, Vol 56, Issue 177
> Well that's all I could think of:
>
> passthrough is passthrough FS never modifies anything.
> you need to look harder at sip trace, pcaps or other diagnostics for
> some misconfiguration.
> many people use this daily.
>
>
> On Tue, Feb 15, 2011 at 1:12 AM, Javier Gallart <jgallartm at gmail.com>
> wrote:
> >
> > Anthony, thanks for the tip. I haven't seen any change though. I should
> have
> > mentioned that I'm focusing in the rtp stream coming form the callee to
> the
> > caller. The problem is that FS relays to the caller only half of the
> packets
> > received from the callee. The packets arrive at FS at a rate of 1 packet
> > every 20 ms, and with a payload of 20 bytes each. Packets from FS to the
> > caller are sent every 40 ms with a payload of 20 bytes, thus skipping
> half
> > of the information.
> >
> > Thanks
> >>
> >> ---------- Forwarded message ----------
> >> From: Anthony Minessale <anthony.minessale at gmail.com>
> >> To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
> >> Date: Mon, 14 Feb 2011 10:38:57 -0600
> >> Subject: Re: [Freeswitch-users] g729 packets skipped in passthrough mode
> >> I bet its 20ms vs 30
> >> set passthru_ptime_mismatch to true either in vars.xml or in your
> >> dialplan both legs through export on the a leg or set in the a leg and
> >> in the {} on b.
> >>
> >>
> >> On Mon, Feb 14, 2011 at 10:28 AM, Brian West <brian at freeswitch.org>
> wrote:
> >> > What exactly is the problem?  I see no issue here can you elaborate on
> >> > what you're seeing?
> >> >
> >> > /b
> >> >
> >> > On Feb 14, 2011, at 4:48 AM, Javier Gallart wrote:
> >> >
> >> >> I've tried to explicitly set ptime at 20ms at switch.conf -although
> >> >> it's not necessary afaik-. Has any one experienced this same issue?
> >> >>
> >> >> Thanks in advance..
> >> >>
> >> >> Regards
> >> >
> >> >
>
>
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