[asterisk-biz] Unlimited DID

[Anand Kumria]

On Wed, 20 Aug 2008 01:24:53 -0700, John van Oppen wrote:

> There is such a thing as totally unlimited inbound assuming you don't
> care about CNAM (as alluded to in another post on this thread).  SIP
> origination can indeed be free as the originating telecom on the PSTN
> has to pay the terminating CLEC for every min used.    This reciprocal
> compensation is what (even in metro areas) helps to fund build out for
> large sip origination carriers.   I can tell you from our experience
> that we use our verizon origination services this way and they have told
> us there are no limits on inbound because they get paid for it.

Indeed.

What a lot of people seem not to realise is that most carriers are paid 
by 3rd parties to terminate calls into their network.

e.g.

You live in London, and use BT to call someone in the US.

You, the customer, pay BT.

BT pays the destination carrier in the US (let's say verizon)

Verizon looks up where they should deliver the call to (let's say your 
SIP server)

Your org. receives the inbound SIP call and does with it what it will.

Here is the call flow:

Cust ---> BT ---> Verizon ---> Your org

Here is the money flow:

Cust -$-> BT -$-> Verizon <--$ Your org

Naturally they want you to use as much incoming as possible, they make 
money from both parties to the call.

Anand