[Asterisk-Users] OT - Originating Network identity

[brett-asterisk at worldcall.net]

In General,
The way carriers derive this information is from CIC codes (Carrier 
Identification Codes) embedded in the SS7 overhead. This is used for 
intercarrier compensation; which is the typical reason you'd care what 
carrier originated the call. 
For more info on CICs:
http://www.nanpa.com/number_resource_info/carrier_id_codes.html

It's a tricky problem to solve really in today new fangled telephony. 
What do you call the "originating carrier" The local provider? The end 
user? The wholesaler? The IXC?  A call that hits you could have 
traversed a dozen networks and the originating network could have been a 
system as simple (or complex) as an asterisk box with one analog 
interface and no SS7 capabilities. Therefore unable to populate a CIC 
code. Therefore their upstream provider may populate that field.

Now, going by strict guidelines CallerID information (including callerid 
number) has NEVER been and should NEVER be used for routing of calls or 
rating of calls as this information is *very* easily changed. Billing 
should be based on BTN and routing should be based on ANI, originating 
trunk group or other trunk specific information (ie: for proper routing 
of 911 calls).

By the way, if anyone out there would like to comment on that premise, 
I'd love to hear what some of you think regarding routing/rating via 
callerID data.

Now if you do use ANI, or BTN for this "lookup", you will have to query 
NPAC to verify who actually owns the number since it could have been 
ported. I would never trust a LERG 6 lookup to tell me the originating 
carrier.

Also, I don't "think" you can query LIDB for originating carrier 
information. LIDB (Line Information DataBase) is primarily used to store 
line options for things like if you allow collect calls, 3rd party 
billing, what kind of line it is (business/res), calling card numbers (I 
believe this is an antiquated use of the system), and sometimes the CNAM 
(caller name) database is coupled with LIDB (as it is with Verisign). In 
fact, I have access to LIDB and it wouldn't let me touch (query or 
otherwise) anything that isn't "me".

-Brett


Matt Klein wrote:

>More specifically, see the data sheet about lidb:
>http://www.verisign.com/stellent/groups/public/documents/data_sheet/001944.pdf
>
>You could go that route, or get a switch, or... there's a variety of other 
>options. But if you're looking for a full number lookup, you're looking 
>for lidb access.. 
>
>-m
>
>On Sun, 26 Dec 2004, Lyle Giese wrote:
>
>  
>
>>That's good to get a general idea, but number portability only tells you
>>which carrier has the block.  It does not let you know about specific
>>numbers :-{
>>
>>Lyle
>>
>>----- Original Message ----- 
>>From: "Matt Klein" <mklein at nmedia.net>
>>To: "Asterisk Users Mailing List - Non-Commercial Discussion"
>><asterisk-users at lists.digium.com>
>>Sent: Sunday, December 26, 2004 5:11 PM
>>Subject: Re: [Asterisk-Users] OT - Originating Network identity
>>
>>
>>    
>>
>>>focus on npa-nxx (area code-prefix)
>>>
>>>if the call is coming from a non-ported number, then
>>>http://telcodata.us/docs/queries.html may help you --
>>>
>>>see the example files..
>>>
>>>there are also a couple other sites out there.. but i've
>>>found this one to be my favorite thus far.
>>>
>>>-m
>>>
>>>On Sun, 26 Dec 2004, oi geli wrote:
>>>
>>>      
>>>
>>>>I am not sure if it is the right list for the post.
>>>>Please excuse my lack of expertise, if it is a bad
>>>>post.
>>>>
>>>>Is there anyway to detect the originating network
>>>>identity of the call in Asterisk? For example, if the
>>>>Asterisk gets a call from Cingular Network, is there
>>>>anyway to find out that the call came from a Cingular
>>>>subscriber.
>>>>
>>>>Thanks
>>>>
>>>>        
>>>>