Welltech WG2504 FXS V.4.02 - Manual (Page 35)

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 Silence Suppression:
Enable: Start the voice activity (silence) detection when detect
silence for 60 seconds, it will hang up the call (For FXO use)
Disable: Send silence packet as normal voice packet (no silence
detection)
 RTP Basic Port: The RTP starting port. Each channel will be add
additional 10. For example, the RTP basic port is 16384, thus call 1 will
use 16384 while call 2 will use 16394 etc.
 RTP Qos Type: IP QoS tag for RTP stream
DiffServ: The differentiated service QoS tag will be used.
Input DSCP value 0-63 for DSCP.
TOS: Type of Service which include IP precedence value
and TOS.