Panasonic Hybrid IP-PBX Manual page 16

2.1 VoIP Requirements
Protocol
DHCP
FTP (Port mode)
Are layer 2 or 3 switches used?
Use of repeater hubs can increase the network load, and therefore may result in degradation in speech
quality.
To ensure high speech quality, use only layer 2 or 3 switches when connecting the IP-EXT16 card to the
LAN. Use of layer 2 or 3 switches for connection is also strongly recommended for IP-PTs.
Note
Note that the port of the switching hub that connects to the IP-EXT16 card should be set to operate
under "Auto Negotiation" mode.
Are Category 5 (CAT5) or higher cables used?
When connecting network devices, make sure to use CAT5 or higher cables. If other types of cables are
used, communications may not be carried out normally.
16 Information about IP Proprietary Telephones
Description
Dynamic Host Configuration Protocol.
Used for receiving an IP address from a
DHCP server.
File Transfer Protocol.
Used for receiving a data file from a FTP
server to upgrade the firmware version.
TCP/UDP Default Port No.
UDP 67, 68
TCP 20, 21