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New Member

ISDN call rejecting due to unknown reason

Hai all

I am trying to connect two sites using

ISDN.But the call is getting rejected.

The "debug isdn q931" message gives

" Cause i = 0x8095 - Call rejected "

The code 95 indicates call rejected due to unknown reason.Does anybody knows the

solution to solve this problem.

Regds

Sudeesh

9 REPLIES
VIP Purple

Re: ISDN call rejecting due to unknown reason

Hello Sudeesh,

this cause code usually indicates that there is a problem with the signalling on the D-channel. Can you post the configurations of your routers ?

Regards,

GP

New Member

Re: ISDN call rejecting due to unknown reason

Sir

I am posting the configuration of both routers

Re: ISDN call rejecting due to unknown reason

Hi

Two things i would suggest here is to remove the dialer pool-member 2,3 from the bri interface.

interface BRI0

no dialer pool-member 2

no dialer pool-member 3

As per your config ur making use of only one dialer to the remote location so theres no need for additional 2 statements.

Also the access-list which permit the traffic by default which is binded with the dialer-list command.

So do mention access-list 1 permit any in ur routers on both the ends..

regds

VIP Purple

Re: ISDN call rejecting due to unknown reason

Hello Sudeesh,

I am not sure if this is a typo, but form your configuration it looks like both your dialer interfaces have the same IP address:

RouterA

!

interface Dialer1

description connection to Lawkim Thn

ip address 172.20.1.1 255.255.255.252

RouterB

!

interface Dialer1

description connection to Lawkim Thn

ip address 172.20.1.1 255.255.255.252

Can you change one of the IP addresses to 172.20.1.2 255.255.255.252, and see if that makes a difference ?

HTH,

GP

New Member

Re: ISDN call rejecting due to unknown reason

hi Gp

I made the mistake in the attachment.In actual

configuration the ip address is 172.20.1.2 255.255.255.252 .

regds

VIP Purple

Re: ISDN call rejecting due to unknown reason

Hello Sudeesh,

can you try and change the static route to a default on both sides ?

ip route 0.0.0.0 0.0.0.0 dialer1

and remove the other static route ? I am not sure if that makes a difference, as the error message indicates that there is something wrong with the D-channel signalling, as mentioned before. Can you do a ´debug ppp authentication´ and post the output, as well as a ´show isdn status´ and post that output, too ? Also, which IOS version are you running ?

Regards,

GP

New Member

Re: ISDN call rejecting due to unknown reason

Sir

The IOS of RtrA is c1700-k9sv3y-mz.122-13.bin

And the show isdn status is

grvisdn1#sh isdn stat

Global ISDN Switchtype = basic-net3

ISDN BRI0 interface

dsl 0, interface ISDN Switchtype = basic-net3

Layer 1 Status:

ACTIVE

Layer 2 Status:

TEI = 103, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

Layer 3 Status:

1 Active Layer 3 Call(s)

CCB:callid=6, sapi=0, ces=1, B-chan=2, calltype=DATA

Active dsl 0 CCBs = 1

The Free Channel Mask: 0x80000001

Total Allocated ISDN CCBs = 1

-----------------------------------------------------

At present I can't send the remote site IOS and sh isdn stat since no access to remote site.I tried the remote site with two different routers.

Initially 800 and now 1700 .Not able to connect

with both routers.

regds

New Member

Re: ISDN call rejecting due to unknown reason

What is missing in your config is PPP authentication.

Try using "ppp authentication chap" in your dialer profiles on both sides of the ISDN link.

Do let us know if the problem is solved and how.

Rgds,

Nitin Bhandarkar

New Member

Re: ISDN call rejecting due to unknown reason

I would also look into the PPP debugs - specifically ppp negotiation and ppp authentication.

Is there any filtering based on incoming ISDN number?

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