Panasonic KX-TDE100 Bandwidth Requirements, Router Requirements, Codec, Packet Sending Interval

1.2.3 Bandwidth Requirements

Router Requirements

•Port Forwarding:

It may be necessary to set the NAT router so that it forwards the incoming packets to the IP address of the V-SIPGW16 card if all of the following conditions are met:

–the PBX uses a STUN server;

–a V-SIPGW16 card is located under a NAT router;

–incoming packets are routed to a SIP Client port or NAT Voice (RTP) UDP port indicated in the [IP Packets to V-SIPGW16 Card] table above.

•SIP-NAT Feature:

When a V-SIPGW16 card is located under a NAT router that supports the SIP-NAT feature*1, it is

recommended to disable this feature.

*1	When NAT is enabled, the router translates the IP address stored in the IP header and the port number stored in the UDP header.
	When SIP-NAT is enabled, the router also translates the IP address and port number stored in SIP messages.

1.2.3 Bandwidth Requirements

When using the V-SIPGW16 card, you must ensure that the WAN has enough bandwidth to support VoIP communications. Refer to the table below and ensure that the sum of the required bandwidth for each channel is smaller than the amount the WAN (e.g., ADSL network) can provide.

Note that the amount in the table is only a guide. Subscribe to a network that has enough bandwidth. If the amount of bandwidth required for VoIP communications is larger than what the network can accommodate, speech quality will be compromised.

Required Bandwidth for Each Channel

The required bandwidth depends on what combination of CODECs and packet sending interval is used. Keep in mind the following points about the type of CODEC and packet sending interval, in terms of the speech quality:

•The speech quality of the CODECs varies as follows: G.711 (High), G.729 (Low)

•The shorter the packet sending interval, the higher the speech quality.

•The higher the speech quality the V-SIPGW16 card provides, the more bandwidth the WAN requires.

CODEC			Packet Sending Interval
	10 ms	20 ms	30 ms	40 ms	50 ms	60 ms
G.711	110.4 kbps	87.2 kbps	79.5 kbps	75.6 kbps	73.3 kbps	71.7 kbps
G.729	54.4 kbps	31.2 kbps	23.5 kbps	19.6 kbps	17.3 kbps	15.7 kbps

8

Programming Manual for Virtual SIP Trunk Card