[cisco-voip] Outbound SIP connection failing in CUBE due to some timer... maybe.

Wed Apr 28 01:19:10 EDT 2021

Thanks Nick! This clears up the mystery of why the router was behaving different from default.

-sreekanth
________________________________
From: Nick Barnett <nick at barnett.email>
Sent: Tuesday, April 27, 2021 9:11 PM
To: Sreekanth Narayanan (sreenara) <sreenara at cisco.com>; cisco-voip <cisco-voip at puck.nether.net>
Subject: Re: [cisco-voip] Outbound SIP connection failing in CUBE due to some timer... maybe.

One final follow-up on this... turns out that YES there was a PSTN switching issue... but also we could have increased a timer on survivability.tcl on the ingress leg. Just leaving this here in case anyone ever does a search.

application
service survivability
param setup-timeout 15

On Mon, Apr 19, 2021, at 8:24 AM, Nick Barnett wrote:
The PSTN issue was resolved by the time I could get more traces. i still have no idea what timer was popping, TAC couldn't figure it out either... so I guess hope you don't ever have a mystery 7 second timer that cuts off your calls.

On Fri, Apr 16, 2021, at 11:25 AM, Nick Barnett wrote:
Unfortunately, I only had ccsip and ccapi inout debugs running... I'll add those 2 other sip debugs the next time. This is what I had handy from last night. I'm sure new traces would be very helpful, but can't get to it right now and wanted to at least respond.

Here is a sanitized copy of the cancel.  The time between the trying and the cancel is always between 6.8 and 6.9 seconds.

CANCEL sip:17633334444 at voip.centurylink.com<mailto:17633334444 at voip.centurylink.com>:5100 SIP/2.0
Via: SIP/2.0/UDP voip.centurylink.com:5060;branch=z9hG4bK2804DC216B
From: sip:1652223333 at 10.10.10.10;tag=7FF3BC40-14BB
To: <sip:17635670707 at voip.centurylink.com<mailto:17635670707 at voip.centurylink.com>>
Date: Thu, 15 Apr 2021 18:39:42 GMT
Call-ID: C6AB9407-9D5011EB-88BF8F36-HI-MOM at voip.centurylink.com<mailto:C6AB9407-9D5011EB-88BF8F36-4C717595 at voip.centurylink.com>
CSeq: 102 CANCEL
Max-Forwards: 70
Timestamp: 1618511989
Reason: Q.850;cause=0
Content-Length: 0

That pesky 0 for the cause code is making life difficult.

On Fri, Apr 16, 2021, at 10:29 AM, Sreekanth Narayanan (sreenara) wrote:
Nick,

What's the disconnect cause from the CUBE? 102?

Do you have logs for this call? Would be clear which timers are expiring, causing the problem.
debug ccsip message
debug ccsip error
debug ccsip info

-sreekanth

________________________________

From: cisco-voip <cisco-voip-bounces at puck.nether.net> on behalf of Nick Barnett <nick at barnett.email>
Sent: Friday, April 16, 2021 6:53 PM
To: cisco-voip <cisco-voip at puck.nether.net>
Subject: [cisco-voip] Outbound SIP connection failing in CUBE due to some timer... maybe.

Yes, very vague subject. Sorry about that. Some calls to certain wireless carriers on our ITSP connections have started failing.

Win10 Jabber client (off of 12.5.su3) -> CUBE -> ITSP

The call goes out Lumen, the 401 auth and challenge response are fine, the INVITE is then sent with SDP. We get a TRYING response which we immediately ACK. Up until this point, the entire call flow is NORMAL.

If we don't receive a 18X response within  7 Seconds, the, the CUBE sends a cancel. Yes, the CUBE.

It appears that the far end is taking too long to send the 18X message. we involved our carrier and they can see the 18X come back a split second later (sometimes), but our side has already closed the connection.

I looked at all of the sip-ua timers and retry settings. nothing adds up to 7 seconds. Most timers are set to 500 msec. I'm not sure where to look? It's not on the sip profile. i tried bumping up the connect, update, info and trying timers (one at a time), but it didn't make any difference. Maybe I was supposed to do something to make sip-ua changes "kick in" like bounce the sip service which I didn't do... not sure on that part.

Please tell me there is something simple I'm missing. Pointers?

Thanks,
Nick

p.s. : some possibly relevant config  and the timers and retries from my sip-ua

retry invite 2
retry response 6
retry bye 10
retry cancel 10
retry prack 10
retry update 6
retry rel1xx 6
retry notify 10
retry refer 10
retry info 6
retry register 6
retry subscribe 6
retry keepalive 6
retry options 6
timers trying 500
timers expires 180000
timers connect 500
timers connection aging 5
timers disconnect 500
timers prack 500
timers update 500
timers rel1xx 500
timers notify 750
timers refer 500
timers hold 2880
timers info 500
timers register 500
timers buffer-invite 0
timers keepalive down 30
timers keepalive active 120
timers dns registrar-cache 3600
timers options 500

Thanks,
Nick

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Thanks,
Nick

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Thanks,
Nick

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