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A1 VoIP Requirements
To limit the number of VoIP channels:
•
Set the status of the ports you wish to disable (starting from the highest-numbered port) to OUS.
For example, if you wish to use only 10 of the available 16 VoIP channels (i.e., disable 6
channels), set the ports 8, 7, and 6 to OUS as shown below:
In this case, the equation for bandwidth calculation, based on the previous example, will be changed
as follows:
Required Bandwidth
= (No. of Fax Machines × Required Bandwidth for the G.711 CODEC) +
[(10 - No. of Fax Machines) × Required Bandwidth for Voice Communication]
= (2 × 87.2) + [(10 - 2) × 31.2]
= 424 (kbps)
A1.2
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 taken into your evaluation.
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).
An unmanaged network, such as the Internet (including an Internet VPN), cannot be used to employ
a VoIP network because delays and loss in data transmission can cause huge degradation in speech
quality.
48
Getting Started
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