IPitomy IP550 User Manual Ver.1 - Manual (Page 22)

Setup
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UPnP This option provides the NAT traverse of an IP phone behind
a NAT router. If selected, the IP Phone will obtain the public
gateway IP address, and the RTP ports mapped from UPnP
server. Select this option only if your LAN has an UPnP
Server.
NTP Time Servers Checking this button enables the NTP protocol to obtain time
and date from Internet.
Time Server 1~3
Specifies the NTP time servers.
Time Zone
Choose the Time Zone for your location from the drop-down
list.
Type of Service
RTP Setting this value other than 0 will enable the ToS of voice
packets (RTP).
VLAN
Global VLAN Enable Checking the box will enable the VLAN settings below.
VLAN ID for Port 0 and
Port 1 Setting the ID value will identify the associated port to a
specific VLAN.
VLAN Priority for Port 0
and Port 1 Setting the priority values will prioritize the packets on the
port.