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New Member

Cisco 1720 won't dial

Hi every body

My Cisco 1720 router dial to internet and everything is OK if it have connected an analog modem (USR 56K message)but if I change this modem with an Zyxel Omni.net LCD (ISDN modem) on the same serial port it doesn't dial. Any ideea?

best regards

Karoly

5 REPLIES
New Member

Re: Cisco 1720 won't dial

first you must be sure that the new modem is ok.

now this new modem seems to be not as standard as USR. so the router should know the type of this modem. you can add the following command to let the router discover the modem type

router(config-line)#modem autoconfigure discovery

Cisco Employee

Re: Cisco 1720 won't dial

The model number you mentioned Zyxel Omni.net LCD is ISDN modem..It dosen't have Analog modem in it. So you can't use the analog line with it. BUT

if you have Zyxel Omni.net LCD+M model does have 56K analog modem in it where you can use POTS line with it. May be you have that model.

Now plug that modem to PC first and try to talk to it using heperterminal. Use ATDTxxxxx (xxxx is the tel number) to dialout just to make sure that you can diaout fine and connect.

After that plug it with the router and try to talk to it using reverse telnet. Here is the link for that

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/dial_c/dcrtelnt.htm

Now if you can dialout fine using reverse telnet then once the router is configured ok, it should dialout too. Turn on following debug for troubleshooting

debug dialer

debug modem

term mon

along with "sh line x" (x is the line number on which modem is on) will help..Thx..Tejal

New Member

Re: Cisco 1720 won't dial

Hi every body

My Cisco 1720 router finaly start to dial to internet with the Zyxel Omni.net LCD but it timeout when sending Ack in the negotiation of the protocol. my ISP use pap. In the configuration I used the dialer interface.

here is a part of the debug screen:

O CONFREQ [ACKsent] id 19 len 16

00:03:16: Se0 LCP: ACCM 0x000A0000 (0x0206000A0000)

00:03:16: Se0 LCP: MagicNumber 0xB0C5721E (0x0506B0C5721E)

00:03:16: Se0 LCP: I CONFREQ [ACKsent] id 9 len 24

00:03:16: Se0 LCP: MRU 1514 (0x010405EA)

00:03:16: Se0 LCP: ACCM 0x00000000 (0x020600000000)

00:03:16: Se0 LCP: AuthProto PAP (0x0304C023)

00:03:16: Se0 LCP: MagicNumber 0x8A09C557 (0x05068A09C557)

00:03:16: Se0 LCP: O CONFACK [ACKsent] id 9 len 24

00:03:16: Se0 LCP: MRU 1514 (0x010405EA)

00:03:16: Se0 LCP: ACCM 0x00000000 (0x020600000000)

00:03:16: Se0 LCP: AuthProto PAP (0x0304C023)

00:03:16: Se0 LCP: MagicNumber 0x8A09C557 (0x05068A09C557)

00:03:18: Se0 LCP: TIMEout: State ACKsent

I have tried with an Cisco 1601 with the same modem but I'm not use the dialer interface and it is work.

There are two questions

a) how can I shutdown the Dialer interface or how can I delete it from the configuration ?

b) what can I set to make the dialer interface to work properly and not time out ACK

Cisco Employee

Re: Cisco 1720 won't dial

Type "no interface dialer x" command where x is the number..to remove the dialer interface from the config.

Now its odd that with dialer interface you are getting "LCP timeout"..To fix it we need to see the config of the router..Thx..Tejal

New Member

Re: Cisco 1720 won't dial

thank's Tejal

I has been removed the dialer interface but the the timeout is still in place.

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