Cisco Support Community
Community Member

ISDN and Dial up Network

Dear Sirs,

I have an ISDN network as the following:

Main office :

Cisco router 2821


Branches :

- Cisco router 1841

- WIC-BRI- S/T -V3

After I complete the configuration all branches working well but I can't add new branches because there is no ISDN lines available in these places just I found Telephone line (Dial up).

The problem is what I need to add in the main router  ( Hardware and configuration)  to make the main router accept the dial up calling ?

Find the attached image about the network which I need.


ISDN branches are working well only the dial up branch (PC) is not working yet.

Thank you for your help.


Hall of Fame Super Gold

Re: ISDN and Dial up Network

On the hub, you need PVDM2-xDM, where x is 12, 24 or 36 according to number of simultaneous modem calls that you want to support.

On the branches, you can use WIC-1AM that is V.92 modem.

Community Member

Re: ISDN and Dial up Network

Dear p.bevilacqua,

Thank you for your reply.

About the PVDM2-xDM where can I install it? on motherboard inside 2811 router ? and what hub did you mean ?

Please see tha attached image it's what you mean?

In the branches I want to use the personal computer ( Win XP ) because in some branches just we have 1 computer .


Hall of Fame Super Gold

Re: ISDN and Dial up Network

Yes, on the motherboard. Hub means the central site of a network.

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