SOYO AVRO3001 - Manual (Page 17)

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Some popular applications and protocol/port numbers mapping are listed
below:
Application Protocol Port Number
Telnet TCP 23
FTP TCP
21
SMTP TCP 25
POP3 TCP 110
H.323 TCP 1720
SNMP UDP 161
SNMP Trap
UDP 162
HTTP TCP 80
PPTP TCP 1723
PC Anywhere
TCP 5631
PC Anywhere UDP 5632
Table 5-1
5.4.3 Special Applications
Some applications require multiple connections, such as Internet gaming
and video conferencing. These applications cannot work when Network
Address Translation (NAT) is enabled. If you need to run applications that
require multiple connections, specify the port normally associated with an
application in the "Trigger Port" field. Select the protocol type as TCP or
UDP and then enter the public ports associated with the trigger port to
open them for inbound traffic.
Figure 5-12