Alg - Draytek Vigor130 Series User Manual

Start Port
End Port
After finishing all the settings here, please click OK to save the configuration.
3 . 3 . 4 A L G
3 . 3 . 4 A L G
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
Enable ALG
Listen Port
TCP
UDP
Vigor130 Series User's Guide
Specify the starting port number of the service offered by
the local host.
Specify the ending port number of the service offered by
the local host.
Description
Check to enable such function.
Type a port number for SIP or RTSP protocol.
Check the box to make correspond protocol message packet
from TCP transmit and receive via NAT.
Check the box to make correspond protocol message packet
from UDP transmit and receive via NAT.
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