SonicWALL TZ 180 Manuel d'utilisateur télécharger pdf (Page 519)

VoIP

519

SonicOS Enhanced 4.0 Administrator Guide

Figure 47:2 Local VoIP Call Flow

The following describes the sequence of events shown in Figure 42.2:

1. Phones A and B register 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 the phones’ private IP addresses and the firewall’s

public IP address. The VoIP server is unaware that the phones are behind a firewall. It

associates the same IP address for both phones, but different port numbers.

2. Phone A initiates a call to phone B by sending a request to the VoIP server - Even

though they are behind the same firewall, phone A does not know Phone B’s IP address.

Phone A initiates a call to phone B using a phone number or alias.

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.The firewall then determines

phone B’s private IP address.

4. Phone B rings and is answered - When phone B is answered, the firewall translate its

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 - Both the called and

calling party information within the messages are translated by SonicOS back to the private

addresses and ports for phone A and phone B.

6. Phone A and phone B directly exchange audio/video/data - The SonicWALL security

appliance routes traffic directly between the two phones over the LAN. Directly connecting

the two phones reduces the bandwidth requirements for transmitting data to the VoIP server

and eliminates the need for the SonicWALL security appliance to perform address

translation.

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