Re: Unable to obtain dialed number through ZAP

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Unable to obtain dialed number through ZAP
\ mark morreny (24 Mar 2008)
. \ Gordon Henderson (24 Mar 2008)
. . \ Jay R. Ashworth (26 Mar 2008)
. . . \ John Novack (26 Mar 2008)
. \ Andrew Kohlsmith (lists) (24 Mar 2008)
. \ Trevor Peirce (24 Mar 2008)
. . \ Lacy Moore (24 Mar 2008)

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Subject:	Re: Unable to obtain dialed number through ZAP
Group:	Asterisk-users
From:	John Novack
Date:	26 Mar 2008

Jay R. Ashworth wrote:
> On Mon, Mar 24, 2008 at 07:49:31AM +0000, Gordon Henderson wrote:
>
>> On Mon, 24 Mar 2008, mark morreny wrote:
>>
>>> What I need to do is to try to route called based on the dialed number as I
>>> have multiple DIDs on my line. Is this something that can be done? Is this
>>> something to do with the hardware that I am using? If so, what kind of
>>> hardware do I need to accomplish this task?
>>>
>> Based on this and your other posts, I'd suggest that it's not possible with your setup. Telephnoe companies don't normally send the called phnoe number down analogue lines, just the calling number (and even if they did,I'm not sure asterisk has a means to extract it)
>>
>
> You're talking about DNIS: Dialled Number Identification Service.
>
> Some telcos can provide it on some analog services, usually those
> described as DID, terminated on Dialogic DID-120 cards, and sold to
> answering services run by little old ladies with 4-digit nixie tube
> display boxes on the shelf next to the WeCO 300 (and no, to coin a
> phrase, I am *not* making this up).
>
> IOW: Yeah, go get ISDN.
>
> Cheers,
> -- jra
>
DID = Direct Inward Dialing
In the telephone world, DID has been available for many years.
Originally as a specialized trunk or set of trunks, where the PBX or
remote end supplied battery towards the CO, and the CO outplused the
last number of digits to the PBX, depending on the size of the PBX this
could have been 3 or more digits. Later DTMF. What you would call an
analog connection.
With proper coding Asterisk SHOULD be able to handle DID trunks with FXS
circuits.
Asterisk can PROVIDE DID access to a PBX via FXO circuits, assuming the
PBX can be programmed for no wink.
Answering services did use devices to decode and display the digits (
Nixie or LED ) so they would know how to answer the line, often on a 1A2
key set. This has evolved in later years to more automated systems.

Somewhere along the line, DID has become misused. What many call DID is
LDN, or Listed Directory Number. LDN is usually the Line Number, though
not all lines have numbers. Many telcos provide a group of lines or
trunks under one number with multiple appearances in a hunt group, often
tarriffed at a different rate.

Probably more than anyone wanted to know about Direct Inward Dialing

John Novack

--
Dog is my co-pilot

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