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50
monitors PORT, PASV, and 227 commands. It performs NAT
on the IP, port, or both in the message and gate opening on
the device as necessary
TFTP ALG
Trivial File Transfer Protocol (TFTP) is a simple protocol used
for files transfer
(RFC 1350)
. TFTP is implemented on top of
UDP, with destination port 69 as the well-known port. The
TFTP Application Layer Gateway (ALG) processes TFTP
packets that initiate the request.
RTSP ALG
The Real Time Streaming Protocol (RTSP) is a network
control protocol designed for use in entertainment and
communications systems to control streaming media
servers.
SIP ALG
The Session Initiation Protocol (SIP) is a communications
protocol for signaling and controlling multimedia
communication sessions. The most common applications
of SIP are in Internet telephony for voice and video calls, as
well as instant messaging all over Internet Protocol (IP)
networks.
