[Asterisk-Users] RC1 problem? (Conversation over two IAX2 streams = nasty, gappy audio)

[hank]

1 what ivr system did you use am curious, 2 what is there contact info for 
support?
----- Original Message ----- 
From: "Andrew Kohlsmith" <akohlsmith-asterisk at benshaw.com>
To: <asterisk-users at lists.digium.com>
Sent: Friday, August 06, 2004 10:34 PM
Subject: Re: [Asterisk-Users] RC1 problem? (Conversation over two IAX2 
streams = nasty, gappy audio)


> Jeremy McNamara and I spent some time tonight figuring this out.
>
> (aside: anyone claiming nufone doesn't have decent customer service is 
> full of
> shit, who else is gonna spend over 3 hours helping a customer?)
>
> The gappy audio problem isn't quite what I first thought:
> It has nothing to do with IAX2, SIP does it too.
> It has nothing to do with a specific codec.
> It has *everything* to do with native bridging.
>
> home* -IAX2- colo* -IAX2- switch-1.nufone.net
>
> I am using xlite to home* but a zap interface does the same thing, the 
> problem
> is with the native bridging between colo* and switch-1.
>
> switch-1 runs RC1
> colo* runs CVS HEAD 20040806 but also ran CVS HEAD 20040604 with the same
> problem.  The gappy audio problem started showing up around the time 
> Nufone
> upgraded to RC1.
>
> home* -> colo* GSM and colo* -> switch-1 GSM: dead audio (from nufone) 
> 1:02
> into the conversation.  It stays dead for a good long time but the remote 
> end
> can hear me (I was calling an IVR and hitting # every 10 seconds or so, it
> could hear me).
>
> home* -> colo* GSM and colo* -> switch-1 iLBC or ULAW, no dead air.
> home* -> colo* iLBC and colo* -> switch-1 iLBC, dead air 1:02 in.
> home* -> colo* iLBC and colo* -> switch-1 ULAW, dead air 1:02 in.
>
> seeing a pattern?  :-)
>
> I've privately sent steve my debug log and a pcap dump of a sample
> conversation.
>
> The conversation is about 6 minutes long and the bulk of it is dead air,
> starting at 1:02.  There are a few (maybe 3 or 4) very short (2s) bursts 
> of
> audio from the remote end but mostly dead air.
>
> So it's gappy alright...  but very much so. Note that the gappy audio has
> changed a little as time went on.  When we first started seeing it (around
> the 20th of June or so) it resembled dropped packets or a congested link.
> Short bursts of silence or garbled audio.  The past few days it was 
> getting
> to be two to three seconds of dead air and now tonight it dies 1:02 in and
> stays dead for a minute or two, then a burst of audio which quickly 
> garbles
> (2s) and then silence for another minute or two.
>
> The IVR I called through Nufone could hear my # key presses.  If I didn't 
> hit
> anything the remote IVR would hang up after 20s or so.
>
> Note that there are no native bridging problems to VoipJet.  They run 0.90
> apparently.
>
> Again: nufone' s been great in helping diagnose this.  Highly recommended.
>
> Regards,
> Andrew
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