AS5350 ISDN voice problem

Unanswered Question
Jun 23rd, 2007

Hi all, i have AS5350 connect to PSTN by E1 line. E1 line connect to port 3/3 on AS5350. I config it to work as voice gateway. I can call from PSTN to voicegateway. But when i call from voicegateway to PSTN i get some problem,

I used command "debug isdn cc" and error is write in attached file.

I sure that the number i called is still available.

See my attached file:

- config file

- error file

Any one can help me to solve this problem

Thanks alot.

Will vote 5* for you

I have this problem too.
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conkinkinconkinkin Sat, 06/23/2007 - 09:03

Hi, this is output after debug isdn q931 is on

and i call to number 1546


GW#csim start 91546

csim: called number = 91546, loop count = 1 ping count = 0

csim err csimDisconnected recvd DISC cid(63)

csim err csimTimeOut t.o while disconnecting cid(63)

csim: loop = 1, failed = 1

csim: call attempted = 1, setup failed = 1, tone failed = 0


E1 Line connect is ok because i can call from PSTN to gateway.

Hope you can help

Thanks first

Paolo Bevilacqua Sat, 06/23/2007 - 09:08

Hello, I'm afraid that you didn't turned on "term mon" before "debug isdn q931", because no information is visible.

conkinkinconkinkin Sun, 06/24/2007 - 05:33

Oh, sorry. I telnet to gateway, but forgot turn on terminal monitor

I write error in attached file after turned on debug isdn q931 and turn on terminal monitor.

Thanks first.

Paolo Bevilacqua Sun, 06/24/2007 - 05:57


1st, you are calling 5146, that seems too short to be a valid PSTN number.

However, by the error reported, it seems that you are not allowed to place calls, pls check with telco if you are.

conkinkinconkinkin Sun, 06/24/2007 - 08:54

I sure that this number is correct.

I can call from PSTN to IP phone via this ISDN line.

But i "show ip int brief" and only channel D is up, other channel is down, is it normal? ( show in error2.txt)

When i call from PSTN to IP Phone, 1 channel B is up (show in error3.txt)

Any thing wrong?

Paolo Bevilacqua Sun, 06/24/2007 - 09:47


The output of "show ip in brief" is normal. Line protocol will never go up for B channel, because it is not a data call.

Now when calling out, you receive "requested channel not available" error, this can be an indication the PRI has been configured by telco only for incoming and not outgoing.

You can try configuring "isdn negotiate-bchan, see documentation, but I never seen the need for this in my experience.

Also, are you sure that all channels are bidirectional in you telco contract ? csim commands may use lower channels while if you do the call via ip/phone dial-peer, it should select an higher channel for outgoing.


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