[cisco-voip] Recovery on timer expiry QSIG

Ahmed Elnagar ahmed_elnagar at hotmail.com
Thu Dec 20 15:29:32 EST 2012 

Could I be facing the below? I run the latest IOS 15.3, also I increased
this timer to the maximum "20 secs" and still the same the call disconnects
after 20 secs instead of 4 secs

How would I make sure if I am hitting this bug or not?

 

CSCti59648 

Symptoms: Intermittently (approximately once every 4 or 5 calls), ISDN calls
are disconnected by the Cisco MGCP gateway. 

Conditions: The symptom is observed because the CallManager times out
waiting for CONNECT_ACK from the MGCP gateway (i.e.: T313 timer). The
gateway does receive CONNECT_ACK from the PSTN almost immediately following
the outgoing CONNECT. However, the gateway seems to encounter huge delays in
back- hauling the CONNECT_ACK to CallManager. 

Workaround: Increase the "T313 timer" service parameter in Cisco Unified
Communications Manager Administration page. Note that while this may
alleviate the issue, the problem could still happen, perhaps less
frequently. 

 

 

Regards,

Ahmed Elnagar | Unified Communication Team Leader | CCIE #24697, Voice

Description: Description: Description: MS Green

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ahmed Elnagar
Sent: Thursday, December 20, 2012 9:59 PM
To: 'Ryan Ratliff'; 'Carlo Calabrese'
Cc: 'VOIP Group '
Subject: Re: [cisco-voip] Recovery on timer expiry QSIG

 

I found the issue "but not solved yet" the timer involved is the T313 which
by default is 4 secs and waits to have a connect ACK from the PBX side in
order not to disconnect the call "although the call works very normally for
the first 4 secs".the PBX is not sending the connect ACK before the 4 secs
and that is why the timer expires and its default behavior is to disconnect
the call.

 

I have PBX people working on this from their side, but my question is can I
disable this timer or at least disable its expiry action "send call
disconnect" until they solve this problem from PBX side?

 

Regards,

Ahmed Elnagar | Unified Communication Team Leader | CCIE #24697, Voice

Description: Description: Description: MS Green

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ryan Ratliff
Sent: Thursday, December 20, 2012 4:44 PM
To: Carlo Calabrese
Cc: 'VOIP Group '
Subject: Re: [cisco-voip] [Bulk] RE: Recovery on timer expiry QSIG

 

T310 is used between call proceeding and alerting/progress/connect.  Since
you are the one sending the call proceeding it's the other side that would
trip that timer.  In this case you are the one disconnecting the call so you
are expecting some message from the other side that you aren't getting.

 

Since you are using MGCP check ccm traces for the call disconnect to see
what exact timer is getting tripped.  That will tell you what to adjust.

 

-Ryan 

 

On Dec 20, 2012, at 8:37 AM, Carlo Calabrese <carlo_calabrese2006 at yahoo.com>
wrote:

 

I think the default is 10000. I did a cut and paste from my router. I use a
2811.

 

From: Ahmed Elnagar [mailto:ahmed_elnagar at hotmail.com] 
Sent: Wednesday, December 19, 2012 11:30 PM
To: 'Carlo Calabrese'; 'VOIP Group '
Subject: [Bulk] RE: [cisco-voip] Recovery on timer expiry QSIG

 

Thanks a lot, but I think 120000 is the default for this timer, how do you
have it showing in the configuration?

 

Regards,

Ahmed Elnagar | Unified Communication Team Leader | CCIE #24697, Voice

<image001.jpg>

 

From:  <mailto:cisco-voip-bounces at puck.nether.net>
cisco-voip-bounces at puck.nether.net [
<mailto:cisco-voip-bounces at puck.nether.net>
mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Carlo Calabrese
Sent: Thursday, December 20, 2012 8:18 AM
To: 'VOIP Group '
Subject: Re: [cisco-voip] Recovery on timer expiry QSIG

 

Here is what I have been using for my QSIG Connection.  You will see it has
the T310 timer in it.

 

int ser 0/0/0:23

no ip address

encapsulation hdlc

isdn switch-type primary-qsig

isdn timer T310 120000

isdn protocol-emulate network

isdn incoming-voice voice

isdn bind-l3 ccm-manager

isdn outgoing ie facility

isdn outgoing ie notify-indicator

isdn outgoing display-ie

no cdp enable

!

 

I have had it running for about 5 years with no problems.

 

Carlo

 

 

From:  <mailto:cisco-voip-bounces at puck.nether.net>
cisco-voip-bounces at puck.nether.net [
<mailto:cisco-voip-bounces at puck.nether.net>
mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ahmed Elnagar
Sent: Wednesday, December 19, 2012 2:16 PM
To: 'VOIP Group '
Subject: [cisco-voip] Recovery on timer expiry QSIG

 

Hi;

 

I have a PBX connected to CUCM using MGCP QSIG, some random calls "only from
PBX to IP Phones" is dropped after 4 or 5 seconds of the start of call to be
connected "both parties hear each other".

 

In debug isdn q931 I got the below

 

Dec 19 12:01:53.820: ISDN Se1/0:15 Q931: RX <- SETUP pd = 8  callref =
0x026D

        Sending Complete

        Bearer Capability i = 0x8090A3

                Standard = CCITT

                Transfer Capability = Speech 

                Transfer Mode = Circuit

                Transfer Rate = 64 kbit/s

        Channel ID i = 0xA18382

                Preferred, Channel 2

        Facility i =
0x9FAA068001008201008B0100A1100201010201553008820301B850860101

        Facility i =
0x9FAA068001008201008B0100A117020102020100800F49545353204D656574696E67205220

        Progress Ind i = 0x8183 - Origination address is non-ISDN 

        Calling Party Number i = 0x0181, '55555'

                Plan:ISDN, Type:Unknown

        Called Party Number i = 0xC9, '66666'

                Plan:Private, Type:Subscriber(local)

        User-User i = 0x00FE, 'U', 0x0100, 'Y', 0x0100B00C07, 'I', 0x81,
'55555', 0x0F11828C82, 'Name01 ', 0x7F030F81000D05, 'I', 0x81, '30',
0xF2900E10818588, 'Name02'

        Shift to Codeset 4

        Codeset 4 IE 0x31  i = 0x80

Dec 19 12:01:53.828: ISDN Se1/0:15 Q931: TX -> CALL_PROC pd = 8  callref =
0x826D

        Channel ID i = 0xA98382

                Exclusive, Channel 2

Dec 19 12:01:53.828: ISDN Se1/0:15 Q931: TX -> ALERTING pd = 8  callref =
0x826D

        Facility i =
0x9FAA06800100820100A117020101020101800F2A596F6E61732042656C6163686577

        Progress Ind i = 0x8088 - In-band info or appropriate now available

Dec 19 12:01:53.828: ISDN Se1/0:15 Q931: TX -> FACILITY pd = 8  callref =
0x826D

        Facility i =
0x9FAA068001008201008B0100A115020101020114300D0A01000A010280053333303332

Dec 19 12:01:55.444: ISDN Se1/0:15 Q931: TX -> CONNECT pd = 8  callref =
0x826D

        Facility i =
0x9FAA068001008201008B0100A123020101020116301B0101FFA0168014596F6E6173204265
6C61636865772D3333303332

        Facility i =
0x9FAA06800100820100A11C0201020201028014596F6E61732042656C61636865772D333330
3332

        Connected Number i = 0x0081, '66666'

 

 

Dec 19 12:01:59.456: ISDN Se1/0:15 Q931: TX -> DISCONNECT pd = 8  callref =
0x826D

        Cause i = 0x80E6 - Recovery on timer expiry

 

Do you think changing T310 timer will solve this or maybe it is another
issue?

 

Regards,

Ahmed Elnagar | Unified Communication Team Leader | CCIE #24697, Voice

<image001.jpg>

 

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