[Asterisk-Users] audio pause/delay problems

[John Todd]

This happens to me as I mention below, but only rarely.  What is your 
CVS version?

JT

>I'm curious. Isn't anyone else noticing these problems? Or are people
>simply not using asterisk for VoIP connectivity over wide-area networks
>this way?
>
>Or does it go away with g729 or other proprietary codecs?
>
>--J.
>
>>  >>>>> "Jan" == Jan Rychter <jan at rychter.com> writes:
>>  >>>>> "John" == John Todd <jtodd at loligo.com> writes:
>>   John> For what it's worth, I have noticed the same problem, but I think
>>   John> the problem is in IAX2, since my long-haul portions of the
>>   John> diagram were over IAX2, while my SIP clients are almost always
>>   John> sitting on the same LAN as the Asterisk server.
>>
>>   Jan> I have noticed these problems both in this kind of setup and in a
>>   Jan> SIP call to a remote Asterisk server.
>>
>>   John> What codec were you testing with over IAX2?
>>
>>   Jan> GSM.
>>
>>  Having investigated this a bit more, it turns out that using alaw
>>  instead of gsm on the IAX2 link makes the problem go away. It seems the
>>  jitter settings start working then.
>>
>>  Any hints? I'd prefer not to be stuck with 80kbps per call...
>>
>>  --J.
>>
>>   > [I have sent a message about SIP problems via gmane, but it seems the
>>   > list is gatewayed one-way only...]
>>   >
>>   > The message was:
>>   >
>>   > I've been trying to use Asterisk as a SIP->PSTN gateway. It runs fine
>>   > when the SIP client is on the local network and there is not packet
>>   > loss. But now I've tried running a remote client (halfway around the
>>   > globe) -- this works great until some packets get lost. After that it
>>   > seems that either my client (linphone) or Asterisk doesn't want to
>>   > resynchronize -- what gets played back is all voice packets as they
>>   > have been received. This creates an increasing lag in the
>>   > conversation and the only way I've found to fix it is to disconnect
>>   > and reconnect again.
>>   >
>>   > Is anyone else seeing this? Is it linphone's fault, or is it expected
>>   > behavior?
>>   >
>>   > Now, I have tried running another * on "my" side of the link. The
>>   > setup then becomes:
>>   >
>>   > linphone -> * -> internet (IAX2) -> * -> PSTN (or echo).
>>   >
>>   > I'm testing with the echo application (GSM used everywhere) and I'm
>>   > getting the same thing: everything seems to work, but sooner or later
>>   > there is an audio pause and the delay grows. It never gets back to
>>   > normal. I've had it grow to as much as 10s.
>>   >
>>   > What makes it even more surprising is the network performance. I've
>>   > had ping running in the background, same TOS settings, 10 packets per
>>   > second. It shows that my RTT is (min/avg/max/mdev) 220/229/287/8.85
>>   > with 0% loss! That's a pretty good network. So where do the pauses
>>   > and delays come from?
>>   >
>>   > --J.
>
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