[SR-Users] Very inconsistent calls

[Brandon Armstead]

This issue occurs when ACK is not routed to proper contact address.

On Sun, Feb 11, 2018 at 6:06 PM, Michael Young <myoung at redmonsters.net>
wrote:

> And just to add to Alex's comment -- in my experience this is almost
> always a firewall issue. Whenever I see a call drop in 32 seconds, it is
> usually because a firewall did not allow the ACK through.
>
> Google "Asterisk drops calls after 32 seconds" and you get 1,180,000
> results...  and the problem is not Asterisk itself.
>
> Michael
>
> -----Original Message-----
> From: sr-users [mailto:sr-users-bounces at lists.kamailio.org] On Behalf Of
> Alex Balashov
> Sent: Sunday, February 11, 2018 7:27 PM
> To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
> Subject: Re: [SR-Users] Very inconsistent calls
>
>
>
> > I have found that calls are very inconsistent.  I use Kamailio 5,
> > Asterisk 14.  When certain Providers like (Sorenson, ZVRS) make calls
> > into a WebRTC client (tryit-jssip), sometime the calls stay up until I
> > close them (10-15 minutes), others times those calls drop in 30
> > seconds.  This is extremely confusing...does anyone else experience
> > this type of behavior?
>
> It is hard to speculate without a capture, and indeed there are lots of
> moving parts with WebRTC. However, the typical reason why an established
> call would drop after ~30 sec (32, to be precise) is that the end-to-end
> ACK from the caller, which completes the required "three-way handshake"
> for call establishment, does not reach the callee. This is because it's
> not constructed correctly by the calling UA, not routed correctly by
> intermediate entities, or isn't sent at all by the calling UA.
>
> --
> Alex Balashov | Principal | Evariste Systems LLC
>
> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
>
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>
>
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>



-- 
Sincerely,
Brandon Armstead
CTO / CRYY.com
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