03-21-2007 02:41 PM - edited 03-13-2019 04:00 PM
Hello everyone,
I'm having a strange issue and was wondering where I should start my troubleshooting. (We're using CallManager Express)
My receptionist tells me that during the week, randomly and intermittently, when someone calls the main phone line, the phone makes a short 'blip' sound and shows up as a missed call.
The night service setting was a suspicion but that's configured correctly everyday from 5pm to 8am the next day.
Has anyone seen this happen and could help me?
Thanks,
Ali
03-21-2007 04:51 PM
Are you using FXO? Perhaps an incomplete incoming call. Try calling the number from outside, hang up as you hear first ringback or even before.
03-21-2007 04:55 PM
Thanks for the reply.
It's actually an E&M card.
IN OUT
PORT CH SIG-TYPE ADMIN OPER STATUS STATUS EC
============== == ============ ===== ==== ======== ======== ==
0/0/0 -- fxs-ls up dorm on-hook idle y
0/0/1 -- fxs-ls up dorm on-hook idle y
0/1/0:0 01 e&m-wnk up dorm idle idle y
0/1/0:0 02 e&m-wnk up dorm idle idle y
0/1/0:0 03 e&m-wnk up dorm idle idle y
0/1/0:0 04 e&m-wnk up dorm idle idle y
0/1/0:0 05 e&m-wnk up dorm idle idle y
0/1/0:0 06 e&m-wnk up dorm idle idle y
0/1/0:0 07 e&m-wnk up dorm idle idle y
0/1/0:0 08 e&m-wnk up dorm idle idle y
0/1/0:0 09 e&m-wnk up up seized seized y
0/1/0:0 10 e&m-wnk up dorm idle idle y
0/3/0 -- e&m-imd up up idle seized y
0/3/1 -- e&m-wnk up dorm idle idle y
The problem is that this occurs intermittently, and personally I haven't seen it happen but heard from them saying this is causing some issues because they're losing their calls...
Ali
03-21-2007 06:30 PM
Does it happens on ds0-group 0 in T1 0/1/0 ?
What "show controller" says ?
Could be some wink timing issue.
You can enable debug vpm signal with logging to buffer or syslog server, and ask the receptions to take a note of the time when it happens. Then try to correlate the event to debug.
Can you reproduce by calling from outside and hang up quickly?
03-22-2007 08:24 AM
Here's the output of sh controllers t1
sh controllers t1
T1 0/1/0 is up.
Applique type is Channelized T1
Cablelength is long gain36 0db
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Version info Firmware: 20060623, FPGA: 20, spm_count = 0
Framing is ESF, Line Code is B8ZS, Clock Source is Line.
CRC Threshold is 320. Reported from firmware is 320.
Data in current interval (785 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
73 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
73 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 24 hours)
0 Line Code Violations, 0 Path Code Violations,
8169 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
8169 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
I'm not sure if there are any inconsistencies in the output - the T1 is configured as follows:
controller T1 0/1/0
mode ccs frame-forwarding
framing esf
linecode b8zs
channel-group 1 timeslots 13-24
ds0-group 0 timeslots 1-10 type e&m-wink-start dtmf dnis
I like the idea of having a syslog server capturing all the events and having them notify me when they encounter the problem... I'll get started on that as well.
As far as reproducing the issue, I don't really believe I can do so... since the call is dropped by itself and not by the caller. For example if you called them, they hear a short blip on the phone and that's it. It'll show your call as a missed call before they're even able to answer it.
Ali
03-22-2007 09:00 AM
Ali,
You are receiving slips on your T1. This is possibily due to a clocking issue. Please make sure you are following the guidelines for clocking on TDM interfaces using voice. I would definitely start there, even though clocking issues are more known for horrible voice quality and one-way audio. Here is a link.
http://www.cisco.com/en/US/products/hw/routers/ps259/products_tech_note09186a008031a072.shtml
Not sure of your complete configuration, but more than likely you will want to configure the commands below. Post a config if you can.
network-clock-participate slot 0
network-clock-select 1 t1 0/1/0
Please rate any helpful posts
Thanks
Fred
03-22-2007 09:37 AM
Very informative, thanks Fred.
The
network-clock-participate wic 1
was already configured on the router, but I added
network-clock-select 1 t1 0/1/0
and it set the line as primary clock source. Before that it was
sh network-clocks
Network Clock Configuration
---------------------------
Priority Clock Source Clock State Clock Type
10 Backplane GOOD PLL
Current Primary Clock Source
---------------------------
Priority Clock Source Clock State Clock Type
10 Backplane GOOD PLL
and now it's
sh network-clocks
Network Clock Configuration
---------------------------
Priority Clock Source Clock State Clock Type
1 T1 0/1/0 GOOD T1
10 Backplane GOOD PLL
Current Primary Clock Source
---------------------------
Priority Clock Source Clock State Clock Type
1 T1 0/1/0 GOOD T1
I tried adding network-clock-participate aim as well but it said the slot doesn't support or is empty so forget that...
Do you think this would alleviate the problem?
Here's a partial config of the router:
memory-size iomem 10
clock timezone PST -8
clock summer-time MST recurring 2 Sun Mar 2:00 1 Sun Nov 2:00
network-clock-participate wic 1
network-clock-select 1 T1 0/1/0
no ip source-route
ip tcp synwait-time 10
voice-card 0
no dspfarm
!
!
!
voice service voip
allow-connections h323 to h323
allow-connections h323 to sip
allow-connections sip to h323
allow-connections sip to sip
supplementary-service h450.12
h323
sip
registrar server expires max 3600 min 3600
voice class codec 1
codec preference 1 g711ulaw
voice translation-rule 1
rule 1 /6779/ /5001/
rule 2 /6779/ /2001/
rule 3 /0419/ /2098/
rule 4 /0418/ /7777/
!
voice translation-rule 2
voice translation-rule 9
rule 1 /^911$/ /911/
rule 2 /^9\(.*\)/ /\1/
!
!
voice translation-profile IncomingMain
translate called 1
controller T1 0/1/0
mode ccs frame-forwarding
framing esf
linecode b8zs
channel-group 1 timeslots 13-24
ds0-group 0 timeslots 1-10 type e&m-wink-start dtmf dnis
translation-rule 1
Rule 1 6779 5001
Rule 2 6775 2099
Rule 3 #### 2001
Rule 4 0418 7777
Rule 5 0417 2010
voice-port 0/0/0
!
voice-port 0/0/1
!
voice-port 0/1/0:0
translate calling 1
translate called 1
!
voice-port 0/3/0
auto-cut-through
operation 4-wire
signal immediate
!
voice-port 0/3/1
operation 4-wire
Thanks again,
Ali
03-22-2007 09:50 AM
Ali,
Well I would take a wait and see approach. Keep a look at your counters on the controllers and make sure the slips stop. Hopefully the voice drops will stop too. Yeah sorry about posting the slot command wasn't sure if that was a WIC or Slot.
Thanks
Fred
03-22-2007 10:41 AM
I jotted down the Slip counts and hopefully the changes will take affect.
I'll give an update on the issue shortly.
I appreciate everyones replies greatly.
Ali
03-23-2007 10:02 AM
Hey everyone,
Just an update from yesterday.
The output of show controllers t1 is now:
sh controllers t1
T1 0/1/0 is up.
Applique type is Channelized T1
Cablelength is long gain36 0db
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Version info Firmware: 20060623, FPGA: 20, spm_count = 0
Framing is ESF, Line Code is B8ZS, Clock Source is Line.
CRC Threshold is 320. Reported from firmware is 320.
Data in current interval (149 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 24 hours)
0 Line Code Violations, 0 Path Code Violations,
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
No Slip Secs anymore...
I really do hope it results in fixing that issue.
I'll give an update in a few days.
Thanks!!
Ali
04-03-2007 10:40 AM
Ok... things are lookin good!
I haven't heard of any dropped calls. Fred thanks for the command that fixed the issue.
Again, I appreciate everyones replies and assisting me in the issue.
04-03-2007 10:53 AM
Thank you for letting us know and the nice rating!
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