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SONICWALL SONICOS 2.5 ENHANCED ADMINISTRATOR’S GUIDE
C
HAPTER
28:
Configuring VoIP Support
• Gatekeepers - Services for call setup and tear down, and registering H.323 terminals for
communications
• Multipoint control units (MCUs) - Three-way and higher multipoint communications between
terminals
SIP
Session Initiation Protocol (SIP) is a signaling protocol used in VoIP. Using SIP, a VoIP client can
initiate and terminate call sessions, invite members into a conferencing session, and perform other
telephony tasks. SIP also enables Private Branch Exchanges (PBXs), VoIP gateways, and other
communications devices to communicate in standardized collaboration. SIP was also designed to
avoid the heavy overhead of H.323.
Configuring the VoIP Settings
The SonicWALL security appliance allows VoIP phone and applications to be deployed behind the
firewall. The Firewall > VoIP page includes the settings for supporting VoIP traffic on the SonicWALL
security appliance.
General Settings
This section provides a configuration task for Consistent NAT.
Consistent NAT - This checkbox is disabled by default. Consistent NAT may need to be enabled for
applications such as Apple iChat. Check this checkbox to maintain non-rotating NAT mappings on
your firewall.