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New Member

I have a question of ISDN

Dear All ,

I have a question of ISDN, Last week China Telecom testing the ISDN line and notice one issue. Beijing  router call to Suzhou no . (051266666666). Suzhou number 051266666666 is virtaul number  and actual connection establish between Beijing and Suzhou real no(05128888888). They advised we need to set one command at Suzhou  pri interface to make Beijing to understand real number and Virtual number is  same. China Telecom do not  know exact cisco command and ask us to check with cisco for this command. Can  you advise or check with cisco for this set up?

Hall of Fame Super Gold

Re: I have a question of ISDN

If it is working, no command is needed.

New Member

Re: I have a question of ISDN

it didn't work, once connecting ,then loss connecting.

Cisco Employee

Re: I have a question of ISDN

It's very vague what you're looking for, but I'm guessing it's something to do with the ANI/DNIS presentation in q.931.

Run 'debug isdn q931' and you can see how it is being sent to the provider.  If you need to change the plan/type or format of a number, you will use a voice translation rule, which is documented on and is a common topic on this site.