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Community Member

2811 modem disconnecting problem

Hi there am having an issue with digital modems disconnecting on a cisco 2811. The router has PVDM2-36DM card and hwic-1ce1t1-pri E1 interface installed.

The E1 is up and I can dialout but the calls drop after 24-30 secs.

I have issued the debug modem csm and the following output is shown.

ebug modem s csm

Modem Management Call Switching Module debugging is on

Dial_SRV#

*May 16 12:13:37.495: Modem 0/322 CSM: received ASYNC_DTR_UP for line 322

Dial_SRV#

*May 16 12:13:40.455: CSM: csm_modem_event called

*May 16 12:13:40.455: Modem 0/322 CSM: Called Number Rcvd = 07879605414

*May 16 12:13:40.455: Modem 0/322 CSM: Dial String to be processed (07879605414)

*May 16 12:13:40.455: Modem 0/322 CSM: End of Dial String

*May 16 12:13:40.455: Modem 0/322 CSM: (CSM_PROC_IDLE)<--MODEM_DIAL_OUT

*May 16 12:13:40.483: CSM: csm_modem_event called

*May 16 12:13:40.483: Modem 0/322 CSM: (CSM_PROC_OC_ISDN_PROCESSING_CALL)<--CSM_EVENT_MODEM_SETUP

*May 16 12:13:40.627: CSM: MODEM_REPORT from 0/0/0:11, call_id=0x800A, event=0x3, cause=0x0, dchan_idb=0x462427A0

Dial_SRV#

*May 16 12:13:40.627: Modem 0/322 CSM: (CSM_PROC_OC_ISDN_PROCESSING_CALL)<--ISDN_BCHAN_ASSIGNED

Dial_SRV#

*May 16 12:13:45.443: %ISDN-6-CONNECT: Interface Serial0/0/0:11 is now connected to 07879605414 N/A

Dial_SRV#

*May 16 12:13:45.443: CSM: MODEM_REPORT from 0/0/0:11, call_id=0x800A, event=0x4, cause=0x0, dchan_idb=0x462427A0

*May 16 12:13:45.443: Modem 0/322 CSM: MODEM_REPORT rcvd DEV_CONNECTED for call_id 0x800A

*May 16 12:13:45.443: Modem 0/322 CSM: (CSM_PROC_OC_ISDN_CONNECT_PENDING)<--ISDN_CONNECTED

technolog_Dial_SRV#

*May 16 12:13:59.851: CSM: csm_modem_event called

*May 16 12:13:59.851: Modem 0/322 CSM: (CSM_PROC_WAIT_FOR_CARRIER)<--MODEM_CONNECTED

Dial_SRV#

*May 16 12:14:09.903: Modem 0/322 CSM: (CSM_PROC_CONNECTED)<--ASYNC_DTR_DOWN

*May 16 12:14:09.983: CSM: csm_modem_event called

*May 16 12:14:09.983: Modem 0/322 CSM: (CSM_PROC_DISCONNECTED)<--MODEM_DISCONNECTED

*May 16 12:14:09.983: Modem 0/322 CSM: Stopping dm tone timer

*May 16 12:14:09.987: Modem 0/322 CSM: (CSM_PROC_DISCONNECTED)<--QUEUED_DISCONNECT

*May 16 12:14:09.987: Modem 0/322 CSM: Stopping dm tone timer

*May 16 12:14:09.987: Modem 0/322 CSM: CSM_MODEM_DEALLOCATE: modem is deallocated

*May 16 12:14:09.987: CSM: called_party_num '07879605414'

*May 16 12:14:09.987: Modem 0/322 CSM: (CSM_PROC_IDLE)<--ASYNC_DTR_DOWN

*May 16 12:14:09.987: %ISDN-6-DISCONNECT: Interface Serial0/0/0:11 disconnected from 07879605414 , call lasted 24 seconds

Dial_SRV#

*May 16 12:14:10.063: CSM: csm_modem_event called

*May 16 12:14:10.063: Modem 0/322 CSM: (CSM_PROC_IDLE)<--MODEM_DISCONNECTED

*May 16 12:14:10.151: CSM: MODEM_REPORT from 0/0/0:11, call_id=0x800A, event=0x0, cause=0x0, dchan_idb=0x462427A0

*May 16 12:14:10.151: CSM: MODEM_REPORT rcvd DEV_IDLE for call_id 0x800A, modem not found due to wrong b channel number or b channel is deallocated

*May 16 12:14:10.987: Modem 0/322 CSM: received ASYNC_DTR_UP for line 322

Dial_SRV#

What stands out is the following line 'modem not found due to wrong b channel number or b channel is deallocated'

I have attached the full config and in it I have configured the time-slots 1-12,16 This is because the organisation does not have the full E1 but only first 12 channels 16 is the d channel.

Any assistance would be much appreciated

Thanks

6 REPLIES
Hall of Fame Super Gold

Re: 2811 modem disconnecting problem

network-clock-select 1 e1 0/0/0

That should solve your issue.

Community Member

Re: 2811 modem disconnecting problem

Hello folks,

I have found the problem.It seems that the software being used on the server to dial out to the remote devices required a modem initialisation string.

We tested dialing out with a normal windows dialup connection and this work perfectly.

Hall of Fame Super Gold

Re: 2811 modem disconnecting problem

Unless you configure the command indicated above, the E1 controller will encounter slips (you can check by yourself) and the modem connection will suffer.

Community Member

Re: 2811 modem disconnecting problem

Thanks p.bevilacqua,

I will add that line of config in as well and see how the testing goes over the next week.

Cheers,

Marc

Hall of Fame Super Gold

Re: 2811 modem disconnecting problem

I may have to correct myself as someone else here reported how the controller was fine without the -select command.

So you may not need it after all.

Community Member

Re: 2811 modem disconnecting problem

No prob thanks again.

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