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Community Member

ISDN ppp negotiation strange issue

I have one PRI line at india and one BRI line at the US.

We are able to connect from india to US. But when we try to call from US to India PRi number, We are getting the bellow error.

the show isdn active is not showing remote hostname (in either router).

PPP LCP negotiation itself not getting completed.

014103: Feb 6 00:14:25: Se1/0:0 LCP: TIMEout: State REQsent

014104: Feb 6 00:14:25: Se1/0:0 LCP: O CONFREQ [REQsent] id 148 len 10

014105: Feb 6 00:14:25: Se1/0:0 LCP: MagicNumber 0x0EF040AD (0x05060EF040AD

014122: Feb 6 00:14:34: Se1/1:29 LCP: TIMEout: State Listen

014123: Feb 6 00:14:34: Se1/1:29 PPP: Authorization NOT required

014124: Feb 6 00:14:34: Se1/1:29 PPP: No remote authentication for call-in

014125: Feb 6 00:14:34: Se1/1:29 LCP: O CONFREQ [Listen] id 36 len 10

014126: Feb 6 00:14:34: Se1/1:29 LCP: MagicNumber 0x0EF09BB2 (0x05060EF09BB2

014127: Feb 6 00:14:36: Se1/1:29 LCP: TIMEout: State REQsent

014128: Feb 6 00:14:36: Se1/1:29 LCP: O CONFREQ [REQsent] id 37 len 10

014129: Feb 6 00:14:36: Se1/1:29 LCP: MagicNumber 0x0EF09BB2 (0x05060EF09BB2)

india end configuration:-

interface Dialer1

ip address x.x.x.x

encapsulation ppp

ip route-cache flow

dialer pool 1

dialer idle-timeout 7200

dialer caller 1234

dialer-group 1

no cdp enable

ppp authentication chap

end

US end configuraton:-

interface BRI1/1

description test

bandwidth 64

ip address x.x.xx

encapsulation ppp

dialer map ip x.x.x.x name test broadcast 01191xxxxx

dialer-group 1

isdn switch-type basic-5ess

isdn tei-negotiation first-call

isdn spid1 mynum1111 num2

isdn spid2 mynum1111 num1

isdn fast-rollover-delay 5

isdn calling-number num1

ppp authentication chap

ppp multilink

I am able to connect and ping when dialer from india. but reverse its not even showing the other in host name in my show isdn active, and I am not able to ping.

3 REPLIES
Anonymous
N/A

Re: ISDN ppp negotiation strange issue

Look at 'show isdn status'. If layer2 does show MULTIPLE_FRAME_ESTABLISHED or stay in that state then get 'debug isdn q921'. For example, try doing a 'shut,no shut' on the interface.

Community Member

Re: ISDN ppp negotiation strange issue

Hi Prasath,

Same configuraions work just fine for me ,make sure you dont have any access list enabled on the US end .Try adding dialer-list 1 protocol ip permit in global config mode & dialer map ip x.x.x.x name test 01191xxxxx (this should be the phone no of the other end)

Try to ping the pri interface ip to bring up the session .

if any issues send the debugs ppp negotiation out put of both side

Community Member

Re: ISDN ppp negotiation strange issue

Thaks for the comments,

Just recently the US telco updated that there could be a possible compression issue at switch side. I will update once i hear from them

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