SonicWALL TZ 180 Bedienungsanleitung PDF herunterladen (Seite 518)

VoIP

518

SonicOS Enhanced 4.0 Administrator Guide

1. Phone B registers with VoIP server - The SonicWALL security appliance builds a

database of the accessible IP phones behind it by monitoring the outgoing VoIP registration

requests. SonicOS translates between phone B’s private IP address and the firewall’s

public IP address used in registration messages. The VoIP server is unaware that phone B

is behind a firewall and has a private IP address—it associates phone B with the firewall’s

public IP address.

2. Phone A initiates a call to phone B - Phone A initiates a call to phone B using a phone

number or alias. When sending this information to the VoIP server, it also provides details

about the media types and formats it can support as well as the corresponding IP

addresses and ports.

3. VoIP Server validates the call request and sends the request to phone B - The VoIP

server sends the call request to the firewall’s public IP address. When it reaches the

firewall, SonicOS validates the source and content of the request. The firewall then

determines phone B’s private IP address.

4. Phone B rings and is answered - When phone B is answered, it returns information to the

VoIP server for the media types and formats it supports as well as the corresponding IP

addresses and ports. SonicOS translates this private IP information to use the firewall’s

public IP address for messages to the VoIP server.

5. VoIP server returns phone B media IP information to phone A - Phone A now has

enough information to begin exchanging media with Phone B. Phone A does not know that

Phone B is behind a firewall, as it was given the public address of the firewall by the VoIP

Server.

6. Phone A and phone B exchange audio/video/data through the VoIP server - Using the

internal database, SonicOS ensures that media comes from only Phone A and is only using

the specific media streams permitted by Phone B.

Local Calls

The following figure shows the sequence of events that occurs during a local VoIP call.

1 2 ... 513 514 515 516 517 518 519 520 521 522 523 ... 842 843

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