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New Member

Cisco 1603 ISDN Connection to NT RAS

Hi all,

I have set up a Cisco 1603 router to perform DDR to our remote access server, which is running Windows NT4 + RRAS and with PRI interface card (E1, 30 lines). I used the Cisco Configmaker to do the job and that Cisco 1603 does sucessfully connect to the NT RAS server. However, even though I use "PPP multilink" command to enable multilink on the Cisco 1603, the router will only connect to NT RAS with a single B channel.

I have checked the NT RAS server, multilink function is enabled, and there are also modem dial-up users with multilink connected to the RAS server.

Is there any thing I need to do to enable multilink on Cisco 1603 router? or the multilink PPP is only available between two Cisco routers?

The IOS I am using is version 11.2, which does support PPP multilink function.

New Member

Re: Cisco 1603 ISDN Connection to NT RAS

config t

int bri0

dialer load-threshold X either

! threshold equals x/255=what percent of the first channel to be loaded to bring up a second

ppp mult


If that doesn't work get:

debug dialer

debug isdn q931

debug ppp nego

term mon






!that should be enough to load the first channel


New Member

Re: Cisco 1603 ISDN Connection to NT RAS

Thank you very much Josh.

I tried that command just now

and I received the following error msg:

Cannot change PPP value of hunt group member

Could please tell me what went wrong with the setting? Thank you in advance.

I will paste dialer and BRI parts of the running-config here for your reference:


interface Dialer1

ip address yyy.yyy.yyy.yyy

encapsulation ppp

no ip split-horizon

dialer in-band

dialer idle-timeout 65536

dialer string xxxxxxxx

dialer hold-queue 10

dialer load-threshold 10 outbound

dialer-group 1

no fair-queue

no cdp enable

ppp authentication chap pap callin

ppp chap hostname cisco

ppp chap password 7 0835444F051C165906081F

ppp pap sent-username cisco password 7 051F0E0E2D495D470D0604

ppp multilink


interface BRI0

no ip address

encapsulation ppp

dialer rotary-group 1

no fair-queue

no cdp enable


All the above settings are acutally generated from Cisco Configmaker. Please advise me what should I change.

New Member

Re: Cisco 1603 ISDN Connection to NT RAS

Thanks Josh,

I just saw the two lights went on on the two BRI channel.

Thank you very much.

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