Panasonic Hybrid IP-PBX, Руководство пользователя

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2.1 VoIP Requirements
16 Information about IP Proprietary Telephones
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.
DHCP Dynamic Host Configuration Protocol.
Used for receiving an IP address from a
DHCP server. UDP 67, 68
FTP (Port mode) File Transfer Protocol.
Used for receiving a data file from a FTP
server to upgrade the firmware version. TCP 20, 21
Protocol Description TCP/UDP Default Port No.