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Dial in through an ISDN line using a mobile phone

We are trying to make a test of a Radius server vía a mobile phone that is able to establish ISDN connections.

We have a Cisco 2600 with a BRI interface as well, and have been provided with an ISDN line. This router is acting as a RAS.

As I understand, we don't need an assynch interface since the phone acts as an ISDN user.

Everything on the bri interface seems to be ok (at least with the "show isdn status" command), but when establishing the connection, I can see that it is cutted with the error message: Bearer capability not currently available.

I've tried everything (the command isdn incoming-voice modem doesn't solve the issue). I'll apreciate any comments that could help to solve this issue.


Re: Dial in through an ISDN line using a mobile phone

Often times complex troubleshooting issues are best addressed in an interactive trouble-shooting session with one of our trained technical assistance engineers. While other forum users may be able to help, it’s often difficult to do so for this type of issue.

To utilize the resources at our Technical Assistance Center, please visit and to open a case with one of our TAC engineers, visit

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.