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New Member

ISDN(BRI) to PBX

Hi, I have a small problem with an NM-8B-S/T connecting to a PBX. (Ericson with Basic Rate Card in it).

All ISDN Layers are active, when I dial into the router, I get the following in the debug. (see attached txt file.)

Anyone have any ideas on this one? What does this imply?

*Mar 6 1993 10:09:38.535 UTC: ISDN BR2/0 **ERROR**: accept_incoming_csm_call: modem problem Requested circuit/channel not available(0x2C): b channel 0, call id 0x175

I did an ISDN test call from the BRI2/0 interface and the call went out successfully, Dial in does as per the below and never succeeds.

3 REPLIES
Silver

Re: ISDN(BRI) to PBX

Did you confirm the ISDN channel is free for dial in ? Did you try to reset the ISDN interface before dial in to the router ? I normally find similar problem when the ISDN channel still not released.

Hope this helps.

New Member

Re: ISDN(BRI) to PBX

Jip did try and do that. Made no difference.

Also when dialing in, looks like the PBX brings up the full BRI 2/0 and not the Bri2/0:1 B-channel?

I found something else though. When doing a 'show modem' it says all the modems are marked B (Bad and not marked for use?) How can I undo that? It is not marked bad in the config and is marked InOut.

Silver

Re: ISDN(BRI) to PBX

I suggest you go through the ISDN troubleshoot flowchart. It can helps.

http://www.cisco.com/en/US/tech/tk801/tk379/technologies_tech_note09186a0080094bb8.shtml

Otherwise, did you confirm there is no configuration issue at PBX side ?

Referring to the "Dial commands reference", marked bad may be the firmware problem of the modem, try "no modem bad" and upgrade the modem firmware.

http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_command_reference_chapter09186a00801a7f1e.html#wp1115576

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