Yealink SIP-T2xP Administrator's Manual page 46

Administrator's Guide for SIP-T2xP and SIP-T19P IP Phones
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 or 100Mbps.
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