[asterisk-users] Does Asterisk support DNIS?

[Ron Fox]

Arriving late to this discussion, sorry if this has already been mentioned
but DNIS and ANI can be variable length without confusion if the sender
uses the "*" DTMF tone as a delimiter. Thus sending *ANI*DNIS* (pronounced
"Star ANI Star DNIS Star" allows the receiver to identify the two values
unambiguously and to find the trailing boundary (when the 3rd "*" has been
received).

We have a Channelized Voice T1 from a long distance provider that is set
up this way into our non-Asterisk PBX where the provider sends us ANI as
the full originating phone number and DNIS as the "last 4 digits".  So the
DTMF string seen by our PBX for someone calling one of our toll-free
numbers, say 800-123-4567, from a local phone in Hawaii, say 808-555-1313,
would be "*8085551313*4567*".  The PBX parses this string and uses the
last 4 digits DNIS to route the call from the T1 trunk group to the proper
internal extension or hunt group.

Do Asterisk and Digium or Sangoma T1/E1 cards know about delimited ANI and 
DNIS?
 
--Ron

On Sun, 18 Feb 2007, Eric "ManxPower" Wieling wrote:

> It will do so automatically if it is working.  Asterisk will stuff those 
> digits into ${EXTEN}, therefore you need an exten => _XXX,1,Whatever if 
> you are expecting 3 digits.
> 
> Until recently we had DID service from our telco on an E&M Wink 
> channelized voice T-1.  The above is what we did.
> 
> David Ruggles wrote:
> > Yuan (and Matt),
> > 
> > Thanks for the reply, I'm sorry I kind of vented, I just got very frustrated
> > with trying to configure Asterisk for what (in a proprietary PBX) is
> > normally one of the easiest parts of configuration.
> > 
> > With a wink start T1 the DNIS digits are transmitted in-band. The Network
> > goes off hook, the PBX winks (goes off hook for 200ms) and then the network
> > sends DNIS (and ANI if used) as DTMF tones, after the PBX gets the tones it
> > answers the call (goes off hook). So you would tell the PBX to look for x
> > number of digits and then after getting that number of digits it will answer
> > the call. I have the Sangoma A101 configured for wink start, but I can't
> > find anything that says how to specify the number DNIS digits to expect. If
> > the PBX answers the call instead of just winking, the DTMF tones will be
> > transmitted during the call which is what seems to be happening here.
> > 
> > For more specific information a good overview of the wink start process can
> > be found here:
> > http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a0080
> > 1123bb.shtml#topic2a
> > 
> > 
> > Can anyone tell me how to configure Asterisk to pickup the DNIS digits off a
> > wink start T1?
> > 
> > Thanks,
> > 
> > David Ruggles
> > CCNA MCSE (NT) CNA A+
> > Network Engineer	Safe Data, Inc.
> > (910) 285-7200	david at safedatausa.com
> > 
> > 
> > 
> > -----Original Message-----
> > From: asterisk-users-bounces at lists.digium.com
> > [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Yuan LIU
> > Sent: Friday, February 16, 2007 5:57 PM
> > To: asterisk-users at lists.digium.com
> > Subject: RE: [asterisk-users] Does Asterisk support DNIS?
> > 
> > Matt already replied to your other posting of similar content.  I'm also a 
> > bit confused.  Do you mean you have observed that Asterisk is brought into 
> > the intended context, but start to react to digits in DNIS one after 
> > another?  If so, can you estimate the interval Asterisk stays in each 
> > extension?
> > 
> > If this is true, it seems to suggest that your provider is sending DNIS as a
> > 
> > DTMF string after Asterisk has answered the call.  Isn't this a bit weird?  
> > What does the card's manual say about DNIS (with wink start)?
> > 
> > Yuan Liu