SIP

The SmartDefense SIP Application Level Gateway (ALG) processes the SIP protocol, allows firewall and NAT traversal, and enables Traffic Shaper to operate on SIP connections.

By default, the SIP ALG checks SIP sessions for RFC compliance. If desired, you can allow non-RFC-compliant SIP connections, so that VoIP devices that initiate non-standard SIP calls can communicate through the firewall. You can also disable the SIP ALG altogether, if it is not needed by your SIP clients, or if it interferes with their operation.

SIP Fields

In this field…	Do this…
SIP Protocol Handler	Specify whether to enable SIP support, by selecting one of the following: Enabled. Enable SIP support. This is the default. Disabled. Disable SIP support.
RFC Non-compliant Messages	Specify what action to take when non-RFC-compliant SIP packets arrive, by selecting one of the following: Block. Block the packets. This is the default. None. No action.

In this field…

Do this…

SIP Protocol Handler

Specify whether to enable SIP support, by selecting one of the following:

Enabled. Enable SIP support. This is the default.
Disabled. Disable SIP support.

RFC Non-compliant Messages

Specify what action to take when non-RFC-compliant SIP packets arrive, by selecting one of the following:

Block. Block the packets. This is the default.
None. No action.