call is getting dropped

[puneet559]

Hello,

Call is getting drop after getting connected . It sometimes gets disconnect after 2 sec and sometimes it get disconnected after50 seconds.

I have run debug.. and following  logs

=================================

Bearer Capability i = 0x8090A3
Standard = CCITT
Transfer Capability = Speech
Transfer Mode = Circuit
Transfer Rate = 64 kbit/s
Channel ID i = 0xA98381
Exclusive, Channel 1
Calling Party Number i = 0x0081, '4695750'
Plan:Unknown, Type:Unknown
Called Party Number i = 0x80, '4223309'
Plan:Unknown, Type:Unknown
156374: May 26 09:13:28.116 UTC: ISDN Se0/2/0:15 Q931: RX <- RELEASE_COMP pd = 8 callref = 0x808A
Cause i = 0x82AC - Requested circuit/channel not available
156375: May 26 09:13:32.532 UTC: %CONTROLLER-5-UPDOWN: Controller E1 0/2/0, changed state to down (10 SES)
156376: May 26 09:13:32.532 UTC: %MARS_NETCLK-3-CLK_TRANS: Network clock source transitioned from priority 1 to priority 10
156377: May 26 09:13:32.532 UTC: ISDN Se0/2/0:15 Q931: L3_ShutDown: Shutting down ISDN Layer 3
156378: May 26 09:13:32.532 UTC: ISDN Se0/2/0:15 Q931: Ux_DLRelInd: DL_REL_IND received from L2

================================

Even i check channel status

Channel State (0=Idle 1=Proposed 2=Busy 3=Reserved 4=Restart 5=Maint_Pend)
Channel : 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
State : 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Service State (0=Inservice 1=Maint 2=Outofservice 8=MaintPend 9=OOSPend)
Channel : 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
State : 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

I have check configuration part

============================

 interface Serial0/2/0:15
no ip address
encapsulation hdlc
isdn switch-type primary-net5
isdn overlap-receiving
isdn incoming-voice voice
isdn send-alerting
isdn bchan-number-order ascending
no cdp enable

====================================

Please advice

[Manish Gogna]

From the debugs it appears to be an issue with the E1 PRI, have you checked with the Telco?

HTH

Manish

[puneet559]

Yeah i have checked but they didnt find any issue on their side. 

[Rajan]

Hi Puneet,

It seems like your controller is flapping. Can you verify the clocking configuration and see if there are any issues.

HTH

Rajan

[puneet559]

yeah I will, it should be same as telco ?  Am i right ?

[puneet559]

In configuration file it mentioned

network-clock-participate wic 2
network-clock-select 1 E1 0/2/0

===========================

[Rajan]

Clock source configured as internal or line ? if its line, then it get the clocking from telco, else its from router backplane clock.

[puneet559]

Line. 
But i am not sure. if call is getting connected than its getting disconnected after 6-7 second then also issue is related to Clocking.

As far as i know if clocking is not set then we dont hear incoming voice

[Suresh Hudda]

There can be more possible causes, few of them are..

1. Check pri cable, try to replace it. 

2. If 2 pri are connected to only one vwic card and both belongs to different different service providers , in that case clocking will be a issue.

3. Try to change the port and vwic card.

4. Most suspected issue is with service provider, so call them to check the issue at their end like MUX, physicall connectivity etc as pri is fluctuating due to some reasons.

Suresh

[puneet559]

Thanks

But i can't see any CRC error, if it had been clocking issue, we must have seen CRC error . Correct me if i am wrong.

[Suresh Hudda]

No, it doesn't mean that directly.

Have you checked with telco service provider ?

Go through below document once for more deep dive..

http://www.cisco.com/c/en/us/support/docs/wan/t1-e1-t3-e3/9319-E1-error.html

Suresh