Is it valid to Dial(DAHDI/g0/12345wwwww88888888) on an ISDN trunk?

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Asterisk Users 6 Comments

I am trying to collect information regarding a bug report for Elastix ( In this bug, an user has asterisk-1.8.7 and dahdi- He is trying to make an outbound call through an ISDN trunk, by placing
Dial(DAHDI/g0/12345wwwww88888888) in order to send 12345, then wait a period, then send 88888888. I am still waiting for a response on what particular telephony card he uses, and the kind of ISDN setup (T1/E1/BRI) being used, but I want to know: Is this
dialstring expected to work with an ISDN trunk? If so, are there any configurations that might cause it to stop working? The user claims that this same dialstring worked with Elastix 1.6 which had dahdi- and asterisk-

Some additional information: the user reports that the dial attempt fails with hangup cause 28. From [^] :

Code No. 28 – invalid number format (address incomplete).
This cause indicates that the called party cannot be reached because the called party number is not in a valid format or is not complete.

Is it actually possible that the code is trying to send a string of ‘w’s through the ISDN link? Or am I misunderstanding?

6 thoughts on - Is it valid to Dial(DAHDI/g0/12345wwwww88888888) on an ISDN trunk?

  • “w” is only allowed as part of the dialed TN on FXO and FXS ports.

    Dial the TN normally, use the D() option to Dial to send post answer digits.

    i.e. Dial(DAHDI/g0/12345,240,D(wwwww88888888))

    See “core show application dial”

  • I’m using ‘w’ to force sending the ‘sending complete’ IE in an ISDN setup message.
    But I don’t know the usage of multiple ‘w’ in the dialstring.

  • El 09/01/12 14:40, Richard Mudgett escribió:
    If I understand correctly, the support for ‘w’ in the dial string was removed when refactoring the PRI signaling code. Was this deliberate, or unintentional? I believe it should be added back for consistency with other signaling types.

  • Exactly which IE message are you trying to push manually? you
    shouldn’t have to do that, it should be done in the configs for you.

    On Mon, Jan 9, 2012 at 1:45 PM, Johann Steinwendtner

  • Its the sending complete IE. I’m using EuroISDN and I also use overlap signalling on this interface.