Set up POTS Dial connection between 2 routers

Unanswered Question
Jun 18th, 2012
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Dear Experts,

I would like to set up a POTS Dial connection between 2 Cisco routers, using the modem card WIC-1AM-V2. I'd like to use this as an out-of-band connection to a remote site, if the primary internet connection fails. So, this setup will only be used in one direction, 1 router placing calls, the other one receiving calls.

Here's my config of the receiving router:

chat-script dial "" ATZ AT OK "ATX3D \T" ATS0=8 TIMEOUT 120 CONNECT \C

interface Async0/2/0
description out of band for network
no ip address
encapsulation slip
async mode interactive

line 0/2/0
session-timeout 5
absolute-timeout 10
script connection dial
login local
modem InOut
transport input all
escape-character BREAK
autoselect ppp
stopbits 1
speed 115200
flowcontrol hardware
line con 0
 exec-timeout 5 0
 logging synchronous
 login local

This config is working fine, when dialing in via a Windows Hyperterminal Dial connection. After a while of dialing I get the login prompt of the router.

Now I want to have a router placing calls instead of a Windows Server. I can't figure out how to tell a router to place calls to a POTS phone number.

Receiving router: 2811, WIC-1AM-V2, IOS c2800nm-ipbasek9-mz.124-25a

Calling router: 1841, WIC-1AM-V2, IOS c1841-advsecurityk9-mz.124-25a

Can you give me any hints?

Thanks in advance


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Overall Rating: 4 (2 ratings)
sebastian.lemke Tue, 06/19/2012 - 23:27
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The config described in this forum post is not applicable for my situation.

Any other suggestions?

paolo bevilacqua Fri, 06/29/2012 - 13:32
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You can search documentation for "configuring DDR".

Note however that dial-up modem speed is insufficient for networking, and in practice can be used only for out of band management.

Daniel ElHani Wed, 08/29/2012 - 22:33
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Hey Sebastian,

Had the same issue, which I just managed to get it resolved.

When you insert the modem, the router will create an Async interface for it lets say Async 0/1/0

then all what you've to do is:


line 0/1/0
exec-timeout 0 0
script dialer DialOut
modem InOut
transport preferred none
transport input all
transport output all
stopbits 1
speed 115200
flowcontrol hardware

and to dial a the remote router all what's required is:

reverse telnet to the above line (show line to know the line number) then type atdt

Let me know in case you still get issues

sebastian.lemke Mon, 09/17/2012 - 06:37
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Thanks gentlemen,

In fact I want to use this connection as an out-of-band mgmt connection.

It seems that using atdt commands from the modem ist the only possibility to do this.

Nevertheless it would be more convenient, I you could dial without doing a telnet onto the modem first...


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