ISDN dial problem from Cisco Router 1751V to 2620-XM

Unanswered Question
Feb 20th, 2007

Pls see below scenario

One Cisco 2620-XM router with IOS 12.2T & Cisco 1751V router with IOS 12.3T.

Now Cisco 2620 router is dialing BRI interface of Cisco 1751 Router & call is perfectly established & Data is processed in both way. But if dialer string is removed from 2620 router & dial happens through 1751. Call doesn't establish even after many trys it appears in ISDN history as called failed. Could you what's wrong here. Awaiting your reply

You can look the command below on both Cisco 2620 & Cisco 1751V routers.

Cisco 2620-XM

!

Interface BRI 1/1

ip address 172.17.1.1 255.255.255.252

encapsulation ppp

dialer string 0145234569

dialer idle-timeout 1500

dialer-group 1

!

Cisco 1751V

!

Interface BRI 0/0

ip address 172.17.1.2 255.255.255.252

encapsulation ppp

dialer string 01122965748

dialer idle-timeout 1500

dialer-group 1

!

I have this problem too.
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b.hsu Wed, 02/28/2007 - 07:14

Correct installation ensures that both transmit and receive audio paths are mapped correctly. Incorrect installation may cause audio paths not to establish properly and, therefore, the digits will not pass correctly between the two connected devices. The desired extension is reached, but the terminal device does not understand the tones when they are pressed

Richard Burts Wed, 02/28/2007 - 10:30

Pankaj

I do not see any authentication on either router. Without authentication the router does not know to what device it is connected. The result is frequently that a router receives a call and then must place a call on the other channel for response traffic. Without a dial string the router can not do that.

I suggest that you configure ppp authentication (either PAP or CHAP) on both routers and see if it improves your problem.

HTH

Rick

smothuku Wed, 02/28/2007 - 21:33

Hi Pankaj ,

Can you modify the config of bri..

If you want to dial from 2620-XM ,

2620-XM:

username XXXXX (Hostname 1751) password XXXX

Interface BRI 1/1

ip address 172.17.1.1 255.255.255.252

encapsulation ppp

dialer string 0145234569

dialer idle-timeout 1500

dialer-group 1

isdn switch-type XXXX

ppp authentication chap

ppp chap hostname XXXXX

ppp chap password XXXXX

dialer-list 1 protocol ip permit.

Cisco 1751V

username XXXXX (Hostname 2620) password XXXX

Interface BRI 0/0

ip address 172.17.1.2 255.255.255.252

encapsulation ppp

dialer caller 01122965748

dialer idle-timeout 1500

dialer-group 1

isdn switch-type XXXX

ppp authentication chap

ppp chap hostname XXXXX

ppp chap password XXXXX

dialer-list 1 protocol ip permit.

If you want to dial from 1751 ,

2620-XM:

username XXXXX (Hostname 1751) password XXXX

Interface BRI 1/1

ip address 172.17.1.1 255.255.255.252

encapsulation ppp

dialer caller 0145234569

dialer idle-timeout 1500

dialer-group 1

isdn switch-type XXXX

ppp authentication chap

ppp chap hostname XXXXX

ppp chap password XXXXX

dialer-list 1 protocol ip permit.

Cisco 1751V

username XXXXX (Hostname 2620) password XXXX

Interface BRI 0/0

ip address 172.17.1.2 255.255.255.252

encapsulation ppp

dialer string 01122965748

dialer idle-timeout 1500

dialer-group 1

isdn switch-type XXXX

ppp authentication chap

ppp chap hostname XXXXX

ppp chap password XXXXX

dialer-list 1 protocol ip permit.

Hope it helps you.

Thanks,

satish

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