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I want my four remote locations to be able to dial any one main office and after doing data transfer

I want my four remote locations to be able to dial any one main office and after doing data transfer the line can be brought down. For example:
main

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office (A) main office (B)
remote site (C) , (d) ,(E) ,(F).

Router C, D, E, and F should be configured in such a way that any time they should be able to dial main office 'B' or 'a' and same main office 'A' or 'B' should be able to dial C,D,E,F. I don't want priority on dialer interface because router A will may have to dial router E and no other router. May be told to dial router C and not D,E,F. it's like any time any number should be dial and not specific dialing.
Following is the configuration. Where you want remote sites to dial any of the location give both dialing-in number otherwise give only one. Also change the hostnames, IP address etc.

On C, D, E or F - remote site
!
hostname remote-C
!
username central-A password cisco
!
interface BRI0 <--  BRI interface used for DDR dialout
ip address 172.20.10.2 255.255.255.0 <-- IP address. The remote address is in the same subnet.
encapsulation ppp
dialer idle-timeout 900  <-- The link will be disconnected if there is no interesting traffic for 900 secs.
dialer map ip 172.20.10.1 name central-A broadcast 1111111
dialer map ip 172.20.10.1 name central-A broadcast 1111112
dialer load-threshold 80 outbound
dialer-group 1 <-- apply interesting traffic definition from dialer-list 1
isdn switch-type basic-ni
isdn spid1 
isdn spid2 
ppp authentication chap
ppp multilink
!

access-list 101 remark Define Interesting Traffic
access-list 101 permit ip any any
dialer-list 1 protocol ip list 101 <-- Interesting traffic is defined by access-list 101. This is applied to BRI0 using dialer-group 1.

On Central Site

!
hostname central-A
!
username remote-C password cisco
!
interface BRI1/0 <-- BRI interface used to accept dialin
ip address 172.20.10.1 255.255.255.0 <-- IP address. The remote address is in the same subnet.
encapsulation ppp
dialer idle-timeout 900
dialer map ip 172.20.10.2 name remote-C broadcast
dialer-group 1 <-- apply interesting traffic definition from dialer-list 1
isdn switch-type basic-ni
isdn spid1 
isdn spid2 
ppp authentication chap
ppp multilink
!         
dialer-list 1 protocol ip permit
!

This was first published in May 2004

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