[OpenSIPS-Users] Multiple Area Codes in Customer Area

[osiris123d]

Thanks for the info.

I will look into this and work up a config.

I also got this direct email about my post from someone else who lives in
the US.  I figured I would go ahead and post below what he sent just so its
out there.


Hello Duane --  

You have hit on one of the more difficult areas in SIP and telephony in
general -- especially here in the North American Numbering Plan.  Below I
will address the problem in general, and not particularly related to the
OpenSIPs question, because IMO you need a solution that will work in any
architecture, not just OpenSIPs.

In a nutshell, I recommend that for your USA users you:

1.) Require From: and Contact: headers to be in NANPA National (10 digit)
format.  This is method is standard in the telephone industry, and will
allow easy integration with North American ANI or Caller ID format,
especially when a call may eventually be handed off to the PSTN.   

2.)  Require incoming To: headers to be in e.164 International format, i.e. 
NANPA-destination numbers all begin with the 1 digit, followed by the 10
digit National number.   Any incoming call to 612xxxxxxx goes to Sydney,
Austrailia, and not Minneapolis, MN.  This requirement should be enforced at
the perimeter of your network, where Customer Equipment can enforce the
"local" digit normalization policy.  

3.)  If you can't enforce #2 above, you will need to "Normalize" incoming
calls to the e.164 International format prior to routing.  The unfortunate
reality here in the USA is that the requirements for how many digits to dial
for a given destination (the "dialing plan") depends on where the call comes
from.   Here in the Chicago area, residents of the 847 area code must today
dial all calls as 11 digits.  Calls within the 312 or 773 area code may
today be dialed as 7 digits, however beginning on 07 November, all calls
originating in 312 and 773 must be dialed as 1+10 digits, due to the new 872
overlay area code.    For more information, see
http://www.nanpa.com/reports/NPA_Dialing_Plans_05_09.pdf

4.)  Finally, if you have any termination carriers who need special
"prefixes,"  append them after you have made your route selection.  

If you would like further information or discussion, please feel free to
contact me.

John S. RobiXXXX

jXX at communXXX.com



Bogdan-Andrei Iancu wrote:
> 
> Hi there,
> 
> When you have to deal with local dialling you need consider the amount 
> of information yon need to keep in order to translate to national format 
> and the complexity of the processing you have to do.
> 
> A compromise solution will be to keep in user profile some information 
> about the location (like for US, the 2 digits Id of the state) - this 
> will reduce the amount of data you need to keep per user. Also, this 
> info can be loaded at auth time, using "load_credentials" parameter 
> (just an example).
> 
> Now, using the location information, you can use dialplan to do the 
> actual transformation. Like, if location is NJ (use a separate plan):
>     if 7 digits -> put 011-201 prefix
>     if  10 digits -> put 011 prefix
> 
> And so on...
> 
> This works pretty fine and scale (not for local dialling but for 
> national dialling in international platforms).
> 
> Regards,
> Bogdan
> 
> osiris123d wrote:
>> I was curious to see how people configure OpenSIPS when their customers
>> could
>> potentially be in different area codes.  I am located in the US.  Say I
>> have
>> customers that are in the following area codes
>>
>> 201-XXX-XXXX    <- New Jersey
>> 339-XXX-XXXX    <- Boston
>>
>> Initially when I was setting up users I configured the username to be
>> just
>> like the persons email address (ex. bobsmith at xyz.com), and configured an
>> alias that included the DID for that person (ex. 2011XXXXX1 at xyz.com).
>>
>> So when bobsmith in New Jersey calls someone and just types 7 digits then
>> obviously its local.  How do people out there using OpenSIPS usually
>> determine if the call is local or not?  I was thinking that I need to
>> swap
>> my username and alias around so that the username is the 10 digit DID and
>> then I can look at the first 3 digits to see what the area code is.  My
>> other idea was to set up Groups for each area code and add the users to
>> their Area Code group and determine it that way.
>>
>> Am I looking at this the right way or am I making this more complicated? 
>> I
>> would like to get my setup right the first time so that this config
>> scales
>> well.
>>
>> Thanks for any input.
>>   
> 
> 
> _______________________________________________
> Users mailing list
> Users at lists.opensips.org
> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
> 
> 

-- 
View this message in context: http://n2.nabble.com/Multiple-Area-Codes-in-Customer-Area-tp3419932p3446978.html
Sent from the OpenSIPS - Users mailing list archive at Nabble.com.