[asterisk-users] PRI Outbound CallerID Question

James jltaylor at metrotel.net
Thu Sep 28 15:34:03 MST 2006

----- Original Message ----- 
From: "Kristian Kielhofner" <kris at krisk.org>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users at lists.digium.com>
Sent: Tuesday, September 26, 2006 4:28 PM
Subject: Re: [asterisk-users] PRI Outbound CallerID Question

> Shawn Kelley wrote:
>> Hi all,
>> I've searched around and haven't found much of an answer to my issue. Any
>> advice from you would be appreciated.
>> Problem: Need to take an inbound call from our PRI and forward it to 
>> another
>> PSTN user via the PRI, sending the original callers id with it.
>> I know this can be done since we currently use an 800 service that does 
>> it.
>> You call the 800 number; they answer and put you on hold. They then 
>> outcall
>> to the pstn numbers we have defined and the incoming call shows up with 
>> the
>> original callers CID, we answer and have options to accept or reject the
>> call.
>> So I know the 800 provider is staying in the middle of the call and not 
>> just
>> performing a redirect to us.
>> I've tried the various CID settings in Asterisk, but am not able to use
>> anything but our DID numbers for our outbound caller id.
>> My telco has been unresponsive to this issue.  Does anyone know if it's 
>> possible with a PRI or do you have to have some
>> other type of PSTN connection such as SS7?
>> Thanks!!
>> --Shawn
> Shawn,
> 1)  When a call comes in, put the original CALLERID(number) into a 
> variable.  This way, if you mess with the real CALLERIDNUM through your 
> dialplan you can always set it back.  I like to use KKFROMCID to make sure 
> that no scripts, Asterisk, etc mess with my original CID!
> 2)  Get a telco that lets you set any CID.  I don't know if I just look 
> trustworthy or something, but I have had no problems whatsoever getting 
> several LECs and CLECs in multiple states to let me set any CID I want. 
> Looking at the other posts, it seems that some people have problems with 
> that.  I never considered it to be a big deal, just a cool privilege that 
> you gain with a PRI...  It seems that isn't the case with some telcos.
> 3)  I don't know if this works or not, but I could swear that there is a 
> redirect possible on PRI (similar to SIP 302).  I don't know if 
> app_transfer (and your telco) support it, but it would be really cool 
> because it would save you in terms of the number of used channels. (Using 
> 0 channels instead of 2).
> Check this thread:
> http://lists.digium.com/pipermail/asterisk-users/2003-May/004594.html
> --
> Kristian Kielhofner

There's a good chance that one reason they are unresponsive is the loss of 
revenue - if you change the caller id number to something that is not 
James Taylor

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