Belkin F5D5230-F Guia do Utilizador descarregar pdf (Página 10)

Porta SIP

System Concepts

The called party is not online

SIP phone A

Unified Messaging

SIP phone B

Offline or

Not Answering

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Porta SIP

Porta UM

Porta Billing

• User A dials 121 in an attempt to reach B. 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, but finds that this

account is not online at the moment. If B has unified messaging

services enabled, the call will be redirected to a voice mail system,

and A can leave a message for him (8). The same thing would

happen if B were online, but not answering his phone (6), (7).

• In any other case, the call will fail.

SIP UA -> PSTN

PSTN

SIP phone A Phone CGW-NY-02

12.34.56.78

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Porta SIP

Porta Billing

• User A attempts to call his co-worker, C. C has not been assigned

an SIP phone yet, thus he only has a normal PSTN phone

number, 12023001234. A’s SIP user agent sends an INVITE

request to the SIP server (1).

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Belkin F5D5230-F Guia do Utilizador Página 10