ISDN status problem

[gcyeaw]

We are using ISDN for dial backup in hundreds of sites, however, one site is experiencing a problem I can't resolve. After a few days of inactivity, the layer three status shows a voice CCB. once this is displayed, the router cannot make a data call. Cycling the interface clears it until the next time.

The calltype is BDA? Is this the result of an incomming call?

ISDN BRI1/0 interface

dsl 8, interface ISDN Switchtype = basic-5ess

Layer 1 Status:

ACTIVE

Layer 2 Status:

TEI = 80, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

TEI = 89, Ces = 2, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

TEI 80, ces = 1, state = 5(init)

spid1 configured, no LDN, spid1 sent, spid1 valid

Endpoint ID Info: epsf = 1, usid = 0, tid = 50

TEI 89, ces = 2, state = 5(init)

spid2 configured, no LDN, spid2 sent, spid2 valid

Endpoint ID Info: epsf = 1, usid = 1, tid = 59

Layer 3 Status:

0 Active Layer 3 Call(s)

CCB:callid=BDA, sapi=0, ces=2, B-chan=1, calltype=VOICE

Active dsl 8 CCBs = 1

The Free Channel Mask: 0x80000002

[tepatel]

CCB which is Call Control Block is stuck for a call on b channel 1. Call type is VOICE but actually i think you have a Data call going out..

Its a issue/bug with the image on the router.

So need to know what are the differences in ios, configs, call direction, switch-type etc..between this site which has problem and other sites which are working fine.

If ios is not the same on all, then make sure to have same ios.

[gcyeaw]

We use the same image on all routers, 12.2(17). We also use generic configs where only the switch type and SPIDS will vary. Most providers will emulate National 1, but this provider does not. I had tried adding 'isdn reject voice', but that did not help. Since we do not initiate voice calls, I am still suspicious that this is the result of an incoming ISDN voice call. I believe, however, that it should be cleared when the call fails.

the config is:

interface BRI1/0

no ip address

encapsulation ppp

dialer rotary-group 0

dialer priority 4

isdn switch-type basic-5ess

isdn spid1 0146999310

isdn spid2 0146935960

isdn reject voice

no cdp enable

!

!

interface Dialer0

ip address xx.xx.xx.xx 255.0.0.0

encapsulation ppp

ip ospf network point-to-multipoint

ip ospf hello-interval 10

dialer in-band

dialer string xxxxxxxxxx

dialer load-threshold 1 outbound

dialer-group 1

no cdp enable

ppp authentication chap

ppp chap password 7 xxxxxxxx

ppp multilink

ppp timeout multilink link add 1

!

[tepatel]

You are right..The CCB and b channel should get cleared when call is cleared. If you are suspecting that there might be a incoming call causing this issue, you can have telco disable incoming calls on that line..Not sure..that option is available but you can try that just for testing.

Also since you are using basic-5ess switch type, you don't need to configure isdn spid1 and spid2 as telco switch will inform the router when bri line comes up. So remove that and after that clear or issue shut/no shut on bri line/interface. See if that makes a difference..else its a ios problem.

[gcyeaw]

The Telco was able to block all incoming calls, so we will wait and see if the situation returns. Thanks for your assistance.

[gcyeaw]

I just discovered a second site with the same problem. It is also a 5ess switch and also the same local service provider. Interestingly, in this site there are two 2B+d's, and the first one has been there quite some time without problems, but the new one has the problem.