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488 Chapter 58 Prerequisites checklist
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Media gateway parameters for IP service
To set up the media gateway resources that you require for optimum IP telephony and VoIP trunk
service, you need to define some basic gateway parameters. These parameters are set in the Media
Gateways panel.
Follow these steps to configure the media gateway:
1 Click Configuration > Resources > Media Gateways.
See Figure 148.
2 Configure the settings according to Table 116.
Figure 148 Media Gateways Panel
Table 116 IP terminals general record fields (Sheet 1 of 2)
Field Value Description
Echo cancellation Enabled w/NLP
Enabled
Disabled
Enable or disable echo cancellation for your system.
Default: Enabled w/NLP (check with your internet system
administrator before changing this)
Echo Cancellation selects what type of echo cancellation is used on
calls that go through a Media Gateway. NLP refers to Non-Linear
Processing.
G.723.1 data rate 6.3 kbps
5.3 kbps
Specify the data rate at which to process calls. This setting is not
negotiated; it is manually administered and the far end must support
the rate.
The rate selection is based on quantity of calls, or quality of voice.
5.3 kbps is a smaller bandwidth therefore more calls can be
supported but the voice quality is lower.
6.3 kbps is a larger bandwidth so fewer calls are supported but
the voice quality is better.
Default: 6.3 kbps
T.38 UDP Redundancy 0-3 This setting defines the number of times the system will transmit a
UDP packet over the network. This setting acts as an error control
mechanism for unreliable networks by providing the same
information more than once, with the intention that at least one of the
copies will transmit correctly.
WARNING: Each redundancy requires the same amount of
bandwidth as the original message. This means that a redundancy of
3 requires four times the bandwidth of a single transmission.
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