[Asterisk-Users] IAX error tolerence??

[Steve Kann]

WipeOut wrote:

> Hi,
>
> Didn't get any opinions on the log file I mailed onto the list over 
> the weekend so I am continuing to try and track the cause for the 
> dropped calls..
>
> I have a feeling that its to do with IAX being way too sensitive when 
> it comes to packet loss.. Since it is going across the internet it 
> needs to be more tolerant when it comes to errors and packet loss..
>
> Are there any settings (in the conf file or the source) that I can 
> change to make it more able to keep the call connected without 
> dropping it when there are errors even if the sound breaks up for a 
> couple of seconds??

There's nothing in chan_iax2 that should cause a call to be dropped if 
there's packet loss for just a couple of seconds.

I think a call is not dropped until retransmission of "reliable" frames 
fails 4 times, if this happens, you should see something like this in 
your log:

"Max retries exceeded to host %s on %s (type = %d, subclass = %d, ts=%d, 
seqno=%d)\n",

Each retry is sent 10 times later than the first retry (up to 10 
seconds). The first retry is sent at twice the round-trip time between 
the two endpoints.

-SteveK