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2.1 VoIP Requirements
12
Information about IP Proprietary Telephones
2.1
VoIP Requirements
2.1.1
Bandwidth Assessment
When using IP-PTs, you must ensure that the IP network in use has enough bandwidth to support VoIP
communications. If the amount of bandwidth required for VoIP communications is larger than the network
can accommodate, speech quality will be compromised. In addition, there may be an adverse effect on the
performance of other applications (e.g., email or web applications) that use the same network. Therefore,
care must be taken when assessing bandwidth requirements.
Inform your network administrator of the required bandwidth, and make sure that the network can support
VoIP communications even under conditions of maximum network traffic.
Required Bandwidth per IP-PT for a Call
The required bandwidth depends on what combination of CODECs and packet sending intervals is used.
Keep in mind the following points about the type of CODEC and packet sending interval, in terms of speech
quality:
•
The speech quality of the G.711 CODEC is higher than that of the G.729a CODEC.
•
The shorter the packet sending interval, the higher the speech quality.
•
The higher the speech quality the IP-PTs provide, the more bandwidth the IP-PTs require.
Required Bandwidth for Each IP-EXT Card
To allow all IP-PTs to make calls simultaneously, it is necessary to keep available the bandwidth required
by an IP-EXT card with the maximum number of IP-PTs connected.
Provided below is the formula to calculate the amount of bandwidth required for each card.
2.1.2
Network Configuration
You must evaluate the structure of the existing network to see if a VoIP network can be implemented. Below
are the points that should be evaluated.
Is the IP network a managed network?
A VoIP network should be implemented on a managed IP network such as Frame Relay, Leased Line, or
IP-VPN (Virtual Private Network).
CODEC
Packet Sending Interval
20 ms
30 ms
40 ms
60 ms
G.711
87.2 kbps
79.5 kbps
—
—
G.729a
31.2 kbps
23.5 kbps
19.6 kbps
15.7 kbps
When using the IP-EXT4 card:
Required Bandwidth = (Required Bandwidth per IP-PT × 4)
When using the IP-EXT16 card:
Required Bandwidth = (Required Bandwidth per IP-PT × 16)
Summary of Contents for KX-TDA50
Page 3: ...Information about IP Proprietary Telephones 3 Section 1 Introduction...
Page 11: ...Information about IP Proprietary Telephones 11 Section 2 Guidance for VoIP Installation...
Page 30: ...3 3 Connecting to the LAN 30 Information about IP Proprietary Telephones...
Page 43: ...Information about IP Proprietary Telephones 43 Appendix A Troubleshooting...