[Spce-user] retries of INVITES for session timers

[Matthew Ogden]

Thanks Andrew.

It seems under perfect network conditions, this situation never occurs
with any of our devices. However, given the structure of our network in
this country, and its reliability (especially on occasion peering issues)
this situation does occur what seems quite frequently- in short bursts (I
obviously don't have any specific stats, but I'm going to take a stab at 1
in 20 calls (greater than 5 minutes) if not greater during peak hours of
8.30am to 4.45pm.  Most calls in our customer base seem to be pretty short
anyway... meaning that 1 in 20 is probably only 100 of total calls. But
its problem if the pattern becomes recognizable by a customer.
Unfortunately, the no are RTP stats and call disconnect causes yet in the
CDR logs (But as I understand from previous emails, It's on a roadmap.)

The problem is also occurring on more than one type of device.

My own personal calls are very lengthy, so I'm often hit by the problem.
For me, what is quite strange is there is no serious call quality problem
during the call - But maybe if 1 in 30 packets is dropping, we are just
seeing the situation of those UDP packets for the reinvites being lost?

I don't really want to disable session timers if possible, so this I why I
wondered if I could get more retries in there to see if that's actually
the issue?

Regards

> -----Original Message-----
> From: Andrew Pogrebennyk [mailto:apogrebennyk at sipwise.com]
> Sent: 18 February 2013 06:00 PM
> To: Matthew Ogden
> Subject: Re: [Spce-user] retries of INVITES for session timers
>
> Hello Matthew,
>
> Well, you have got it perfectly right it seems; the caller does not
respond to
> session refresh.
>
> Something may be more fundamentally wrong with this client if it doesn't
> respond to in-dialog requests - but anyway in version 2.7 you can easily
> disable session timers to that subscriber completely; just set
sst_enable on
> Preferences tab to No.
>
> Hope this helps.
> Andrew
>
> On 02/16/2013 10:00 AM, Matthew Ogden wrote:
> > Hi Andrew,
> >
> >
> > Attached is the LB log. I haven't replied to the list yet, as the
> > actual IPs are in the file.
> >
> > There are two requests for New request - M=INVITE
> > R=sip:(blanked out) at
> Feb
> > 14
> > 09:22:33 to
> > But there is no Reply from Outbound - S=200
> >
> > Unlike the other device which did sent its Reply from Outbound -
S=200.
> >
> > Then later the SPCE sends this to other device Feb 14 09:25:03 spce
> > /usr/sbin/kamailio[1396]: INFO: <script>: New request - M=BYE
> > R=sip:WS001A001
> > Then the device who never originally replied,  gets told the call is
> > no longer valid etc.
> >
> >
> > Regards
>