Yealink SIP-T48G Administrator's Manual page 103

Half-duplex
Half-duplex transmission refers to transmitting voice or data in both directions, but in
one direction at a time; this means one device can send data on the line, but not
receive data simultaneously. You can configure the half-duplex transmission on both
Internet port and PC port for the IP phone to transmit in 10Mbps or 100Mbps.
Full-duplex
Full-duplex transmission refers to transmitting voice or data in both directions at the
same time; this means one device can send data on the line while receiving data. You
can configure the full-duplex transmission on both Internet port and PC port for the IP
phone to transmit in 10Mbps, 100Mbps or 1000Mbps (1000Mbps is only applicable to
SIP-T48G/T46G/T42G/T29G/T23G/CP860 IP phones).
Procedure
The transmission methods of Ethernet ports can be configured using the configuration
files or locally.
Configuration File <y0000000000xx>.cfg
Configure the transmission methods
of the Internet (WAN) port.
Parameters:
network.internet_port.speed_duplex
Getting Started
83