asterisk users - Mar 2008 - SIP carrier billing technicalities

Hi,

Does anyone know anything about the following?

In a hosted environment where several area DIDs are provisioned on a
single server, how do most carriers establish the origination DID,
number.

Asterisk allows us to modify the CallerID, name, number and DNID
channel variables before dialling out via SIP.  Most carriers will
allow us to spoof a callerID when placing a call, and pass it forward.
 We can also spoof the DNID also before the call is placed, although I
am not sure this is carried forward to the outgoing proxy, using SIP.

Do most carriers the carrier just use CallerID as an origination
number?  As far as I am aware, the concept of a BTN is gone with
SIP....

Does this mean its possible to save money on your bill, by modifying
CallerID so that the origination number is seen to be a local call?

anyone care to comment?

Robert

Hi,

Does anyone know anything about the following?

In a hosted environment where several area DIDs are provisioned on a
single server, how do most carriers establish the origination DID,
number.

Asterisk allows us to modify the CallerID, name, number and DNID
channel variables before dialling out via SIP.  Most carriers will
allow us to spoof a callerID when placing a call, and pass it forward.
 We can also spoof the DNID also before the call is placed, although I
am not sure this is carried forward to the outgoing proxy, using SIP.

Do most carriers the carrier just use CallerID as an origination
number?  As far as I am aware, the concept of a BTN is gone with
SIP....

Does this mean its possible to save money on your bill, by modifying
CallerID so that the origination number is seen to be a local call?

anyone care to comment?

Robert

I'm not exactly sure how this works myself either.
Most sip providers charge based on the destination you are calling. I'm not
sure how providers do this if they have different rates for local area and
national calling areas.
I would assume that if you have say a 212 did if you set the caller id
string to a 212 number and have a local calling area of 212 that since those
both match the provider would give you the call for free.
I could be wrong though.

Tom

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Robert
McNaught
Sent: Monday, March 24, 2008 7:41 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [asterisk-users] SIP carrier billing technicalities

Hi,

Does anyone know anything about the following?

In a hosted environment where several area DIDs are provisioned on a
single server, how do most carriers establish the origination DID,
number.

Asterisk allows us to modify the CallerID, name, number and DNID
channel variables before dialling out via SIP.  Most carriers will
allow us to spoof a callerID when placing a call, and pass it forward.
 We can also spoof the DNID also before the call is placed, although I
am not sure this is carried forward to the outgoing proxy, using SIP.

Do most carriers the carrier just use CallerID as an origination
number?  As far as I am aware, the concept of a BTN is gone with
SIP....

Does this mean its possible to save money on your bill, by modifying
CallerID so that the origination number is seen to be a local call?

anyone care to comment?

Robert

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SIP Carriers will determine who you are by the username/password in
the INVITE request or by using IP address authentication not by the B
Number. Changing the B Number will not make any difference to the way
you are billed.

Regards,

Greyman.

>  Do most carriers the carrier just use CallerID as an origination
>  number?  As far as I am aware, the concept of a BTN is gone with
>  SIP....
I don't know about most carriers, but the couple "bigger"
providers
we're using use CallerID as the BTN for outgoing calls. They bill us
by destination LATA/OCN and determine if it's an intrastate or
interstate (inter/intra-LATA) call based on CallerID. Therefore calls
from the same machine (no user/pass since they authenticate by IP) are
billed differently simply due to CallerID. So yes, technically it's
possible to be charged the lower interstate rate for an intrastate
call if the CallerID is set out of state, but IMO that doesn't make a
good impression and isn't worth the savings. YMMV.

/Luki