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ALG means Application Layer Gateway. There are two methods provided by Vigor router,
RTSP (Real Time Streaming Protocol) ALG and SIP (Session Initiation Protocol) ALG, for
processing the packets of voice and video.
RTSP ALG makes RTSP message, RTCP message, and RTP packets of voice and video be
transmitted and received correctly via NAT by Vigor router.
However, SIP ALG makes SIP message and RTP packets of voice be transmitted and received
correctly via NAT by Vigor router.
Available settings are explained as follows:
Item Description
Enable ALG Check to enable such function.
Listen Port Type a port number for SIP or RTSP protocol.
TCP Check the box to make correspond protocol message packet
from TCP transmit and receive via NAT.
UDP Check the box to make correspond protocol message packet
from UDP transmit and receive via NAT.
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