Network Devices - Panasonic KX-TDA30 Manual

Are the IP-EXT card and IP-PTs located appropriately?
Transmission delays can cause pauses and loss in VoIP communications. The more routers there are between
the IP-EXT card and IP-PTs, the longer the transmission delays. This is because a certain amount of delay is
inevitable when packets pass through each router.
Additionally, the more switching hubs between the card and IP-PTs, the longer the transmission delays,
because the switching hubs must also handle the network traffic generated by other terminal devices (e.g.,
PCs) connected to them.
To prevent unnecessary delays, it is recommended to connect the card and IP-PTs so that there are as few
network devices (e.g., routers, switching hubs) between them as possible.

2.1.3 Network Devices

You must evaluate the network devices that are used in the existing network to see if a VoIP network can be
implemented. Below are the points that should be evaluated.
Can the firewall pass packets from IP-PTs?
If the VoIP network contains a firewall, the firewall must be configured appropriately to allow VoIP packets,
listed in the table below, to pass through the network without being blocked by filtering.
For more information, consult your network administrator.
Protocol
RTP (IP-EXT)
RTP (IP-PT)
Maintenance (IP-EXT)
Maintenance (IP-PT)
IP Network
Router
Switching
Hub
Switching
Hub
Real-time Transport Protocol.
Used for voice data transmission.
Panasonic proprietary protocol.
Used for communication parameter ne-
gotiation with the PBX, download of
country/area data, confirmation of con-
nection with the PBX, and notification of
error messages and statistical informa-
tion to the PBX.
Router
Switching
Hub
Description
2.1.3 Network Devices
TCP/UDP Default Port No.
UDP 8000 to 8063
(IP-EXT16)
8000 to 8015
(IP-EXT4)
UDP 8000 to 8063
(IP-EXT16)
8000 to 8015
(IP-EXT4)
UDP 9300
UDP 9301
Information about IP Proprietary Telephones 17