I'm also getting this issue, for some reason some calls yield mass
VNAK's. I
also get iseq problems, but that might be my code - eg
DEBUG[98311]: File chan_iax2.c, Line 4368 (socket_read): Received iseqno 4
not within window 0->2
DEBUG[98311]: File chan_iax2.c, Line 4368 (socket_read): Received iseqno 4
not within window 0->2
DEBUG[98311]: File chan_iax2.c, Line 4368 (socket_read): Received iseqno 4
not within window 0->2
Both happen in 5% of the time.
----- Original Message -----
From: "Matt Lawson" <matt@1control.com>
To: <asterisk-users@lists.digium.com>
Sent: Friday, December 19, 2003 7:59 AM
Subject: [Asterisk-Users] Excessive VNAK's and jitter over IAX2
> Howdy,
>
> I recently saw something strange with a call between *'s over IAX2.
> There are actually 3 *'s involved. The setup is like this:
>
> SIP phone ------(ulaw over LAN)------ *1 -------- IAX2 (ulaw over
> Internet) ---------*2--------(GSM over Internet)
> -----------*3--------(ulaw over LAN)------ SIP phone
>
> Now what is shown below is the Asterisk in the middle, that is doing the
> conversion between the other two, one of which only speaks ulaw and the
> other only speaks GSM.
>
> The call basically seemed to work, except the audio quality was
> terrible, but it did seem to be basically connected. Asterisk started
> spewing out these VNAK messages, thousands of them as fast as it could.
> In the middle of it I did an "IAX2 show channels" to show what
was in
> progress.
>
> The asterisk version shown here is a completely stock, CVS version from
> just a few days ago. The "outboard" Asterisks are somewhat
modified but
> also re-synchronized with CVS within the last week.
>
> Also, all Asterisks have iax jitterbuffer=no.
>
> So, my questions are:
>
> 1. What do the excessive VNAKs indicate? Some type of communication
> error? NAT-related perhaps?
> 2. Does the 20,000+ jitter have something to do with the audio sounding
> terrible?
> 3. Why is there jitter at all if all Asterisks have their IAX2 jitter
> buffers turned off?
> 4. Is there any significance to the "Username (none)" for one of
the
> peers? The Asterisk has both peer and user names for both machines.
> The caller name shows up, but the callee name is always "(None)"
>
> Ideas anyone? Thanks.
>
>
> DEBUG[98311]: File chan_iax2.c, Line 4649 (socket_read): Sending
> VNAK
> DEBUG[98311]: File chan_iax2.c, Line 4649 (socket_read): Sending
> VNAK
> DEBUG[98311]: File chan_iax2.c, Line 4649 (socket_read): Sending
> VNAK
> DEBUG[98311]: File chan_iax2.c, Line 4649 (socket_read): Sending VNAK
>
> s
>
> Peer Username ID (Lo/Rem) Seq (Tx/Rx) Lag Jitter
> Format
> 24.9.xx.xxx i58 00009/00003 00015/00006 00000ms 0169ms
> ULAW
> 66.167.xx.xxx (None) 00010/00004 00008/00013 00009ms 20743ms
> GSM
> 2 active IAX
> channel(s)
>
> *CLI> DEBUG[98311]: File chan_iax2.c, Line 4649 (socket_read): Sending
> VNAK
> DEBUG[98311]: File chan_iax2.c, Line 4649 (socket_read): Sending
> VNAK
> DEBUG[98311]: File chan_iax2.c, Line 4649 (socket_read): Sending
> VNAK
> DEBUG[98311]: File chan_iax2.c, Line 4649 (socket_read): Sending VNAK
>
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