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Community Member

ISDN problem

we have one central router of 3600 series.our remote offices are connected to this router through ISDN.PRI is terminated in the central router and BRI at remote location.Remote routers dial to central router. Now, i want that only central router should dial to remote router, how this can be me out.i need this facility so that charges can be made on the basis of PRI connection....

plz help me out


Re: ISDN problem

HI Friend,

Hope this config may help you


interface Serial4/1:15

description ** ISDN PRI **

bandwidth 128

ip address x.x.x.x x.x.x.x

encapsulation ppp

dialer map ip name broadcast

dialer map ip name broadcast

dialer map ip name broadcast

dialer load-threshold 50 outbound

dialer-group 1

isdn switch-type primary-net5

no fair-queue

ppp authentication chap

ppp multilink


dialer-list 1 protocol ip list


now just configure access list for your interesting traffic by which I mean traffic which you want should trigger the isdn to the remote site.

There are many other ways to configure PRI to dial remote site and to fine tune the setup and above is just the one example which I have pasted .



Re: ISDN problem


Dont forget to add the dialer string which u used to dial out and get connected to the remote location.

dialer map ip name broadcast 12345678

@ the remote location u can just keep it with

dialer map ip name broadcast to accept the dial ins from the central location.

do check this link for more info & also the sample config..

Also would suggest to keep the current config intact with the dialers shut and make a new dialer to help u achieve this or else do take out a backup of the original working config before starting the modifications..


Community Member

Re: ISDN problem

dialers had been configured on central router where PRI is terminated.PRI has been configured on serial interface of central router and dialers are made...

what should be the configuration on central router and remote me out

Community Member

Re: ISDN problem

Hi Mini,

before designing first thing to consider what is the source of interesting traffic. If its central site then no issue u just needs to config the PRI either thru dialer profile or dialer map. If remote site is source of interest then u may think for callback option.


Community Member

Re: ISDN problem

remote site is source of traffic...

now how to i do the configuration on central site as well as remote site...

can anybody give me detailed configuration?????

Community Member

Re: ISDN problem

HI Mini,

Hope this help you

For Callback Server :

HUB-ROUTER(config)#interface bri 0

HUB-ROUTER(config-if)#ip address

HUB-ROUTER(config-if)#encapsulation ppp

HUB-ROUTER(config-if)#dialer callback-secure

HUB-ROUTER(config-if)#dialer map ip name CLIENT-ROUTER class

dial1 4085552222


HUB-ROUTER(config-if)#ppp callback accept

HUB-ROUTER(config-if)#ppp authentication chap


HUB-ROUTER(config)#map-class dialer dial1

HUB-ROUTER(config-map-class)#dialer callback-server username

For Callback Client :

CLIENT-ROUTER(config)#interface bri 0

CLIENT-ROUTER (config-if)#ip address

CLIENT-ROUTER (config-if)#encapsulation ppp

CLIENT-ROUTER (config-if)#dialer map ip name HUB-Router


CLIENT-ROUTER (config-if)#dialer-group 1

CLIENT-ROUTER (config-if)#ppp callback request

CLIENT-ROUTER (config-if)#ppp authentication chap

NOTE: pls put ACL for interesting traffic ( hub to client and viceversa in respective router).


Community Member

Re: ISDN problem

will this configuration work for PRI?...

let me tell you in detail...

central router has PRI configuration and dialers are made for all remote locations.

remote location router has BRI present scenerio only remote router dials the central router...

now , i want that central router dials the remote router....

what configuration is to be done in central router(with PRI configuration) and remote end(BRI configuration)

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