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SonicOS Enhanced 4.0 Administrator Guide
• H.264, H.263, and H.261 for video
• MPEG4, G.711, G.722, G.723, G.728, G.729 for audio
VoIP Protocols that SonicOS Does Not Perform Deep Packet Inspection on
SonicWALL security appliances do not currently support deep packet inspection for the
following protocols; therefore, these protocols should only be used in non-NAT environments.
• Proprietary extensions to H.323 or SIP
• MGCP
• Megaco/H.248
• Cisco Skinny Client Control Protocol (SCCP)
• IP-QSIG
• Proprietary protocols (Mitel’s MiNET, 3Com NBX, etc.)
How SonicOS Handles VoIP Calls
SonicOS provides an efficient and secure solution for all VoIP call scenarios. The following are
examples of how SonicOS handles VoIP call flows.
Incoming Calls
The following figure shows the sequence of events that occurs during an incoming call.
Figure 47:1 Incoming VoIP Call Flow
The following describes the sequence of events shown in Figure 42.1: