Belkin F5D5230-F Guia do Utilizador descarregar pdf (Página 11)

Porta SIP

System Concepts

• The SIP server performs a number lookup in the billing (2). It

finds that this number does not belong to any SIP accounts, i.e. it

does not exist in the customer’s VoIP network, and therefore

must be routed to the proper vendor for termination (3).

• The SIP server transfers control to the B2BUA. The B2BUA

sends an INVITE request to the billing, asking for routing

information (4).

• The billing engine checks if A is actually allowed to call this

number and what is the maximum call duration. After that, it

checks which vendors are able to terminate the call to

12023001234 and produces a list of possible routes according to

routing preferences (5).

• The SIP server tries to send a call to all routes returned by the

billing sequentially, until either a connection is made or the list of

routes is exhausted (6).

• When the call is finished, the SIP server sends accounting

information to the billing.

Terminating SIP calls to a vendor using VoIP

PSTN

Phone C

SIP phone A

SIP Server

60.1.2.80

X-Telecom

Vendor

23 45

Porta SIP

Porta Billing

• An example: we are able to terminate calls to the US and Canada

to a vendor, X-Telecom. This would then be described as a VoIP

to vendor connection in the billing, with the remote address being

the address of the vendor’s SIP server (or SIP-enabled gateway).

• The billing engine returns the IP address of the vendor’s SIP

server in the route information, with login/password optional.

The PortaSIP server sends an INVITE request to that address

(providing the proper credentials), and then proceeds in basically

the same way as if it were communicating directly with C’s SIP

user agent.

• After the call is established, the B2BUA starts the call timer,

disconnecting the call once the maximum call duration is

exceeded.

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