Belkin F5D5230-F Guía de usuario descargar pdf (Pagina 9)

Porta SIP

System Concepts

Call Process / Supported Services

SIP UA <--> SIP UA

An example: a customer purchases our VoIP services, and two of his

employees, A and B, are assigned SIP phone numbers 12027810003 and

12027810009, respectively. For convenience, the administrator creates

two abbreviated dialing rules: 120 for 12027810003 and 121 for

12027810009.

When the called party is online

SIP phone A SIP phone B

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Porta SIP

Porta Billing

This is the simplest case:

• User A dials B’s number (121). His SIP user agent sends an

INVITE request to the SIP server (1).

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

example, if user A dials 121, the billing will inform the SIP server

that the actual number is 12027810009, and that this number

belongs to B (3).

• The SIP server checks its registration database to find the actual

contact address of the SIP user agent with that number.

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

sends an INVITE request to the billing (4).

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

number and what is the maximum call duration (5).

• The SIP server sends INVITE to the SIP user agent for user B

(6).

• Depending on the configuration, the SIP server may let A and B’s

user agents talk directly to each other, or else route the call

through the RTP proxy.

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

information to the billing.

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Belkin F5D5230-F Guía de usuario Pagina 9