Asterisk and Cisco 3825 with ISDN

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Asterisk Users 2 Comments

I recently subscribe for an ISDN and terminate it on a Cisco 3825 router. I used it as a sip trunk for my asterisk. i’m a newbie when it comes to ISDN. and i’ve been experiencing some issues:

1. Call Hangup:

When hangup is initiated from the outside the extension (softphone/ip phone/VoIP Phone) does not hangup, is this normal? shouldn’t asterisk hangup the extension as well when it receives the hangup properly from ISDN? or maybe it’s because asterisk does not detect the proper hangup?

2. Caller-ID for incoming calls:

When i call in to the ISDN using my hand phone there are times that my handphone number shows up on the extension but there are times it does not, what it shows is the main isdn number i subscribed to.

I called using my mobile (33232333) to 82301000 on the extension i see the correct caller-id 82301510 which is wrong (this number is the main line for my isdn)

Can anyone please advice ow do i start troubleshooting this issues?

TIA. Regards,

2 thoughts on - Asterisk and Cisco 3825 with ISDN

  • I don’t understand your inside versus outside description. But the main point:
    * you have ISDN on a 3825, and you have voip.
    * somewhere the SIP hangup doesn’t initiate an ISDN hangup.

    This may be (is probably) due to you having your ISDN settings
    incorrect for the line setup. There are about a dozen combinations of
    settings for the way your ISDN line could be setup.

    Is this a T1 PRI?
    Are you taking timing from the telco?
    Do you have your D-channel set correctly?
    Do you have your DSP settings correct for your chosen voip codec?

    You need an IOS manual to make sure all that is set correctly. You
    can’t download one from Cisco unless you pay for support and get a
    service contract. Once you get that right, you’ll also see the
    settings in the Cisco manual for pushing caller ID correctly. I think
    all of your problems are on the Cisco side, and zero are on the
    asterisk side.

    Or you could scrap the 3825 and get a Digium PRI card and use DAHDI.
    Then it would be an asterisk question 🙂