Vodavi XTS-IP Technical Information download pdf (Page 502)

D-6 Installation

Appendix D - Voice Over the Internet Protocol

Technical Data

Lower bandwidths, lower connection reliability, and high network latency will decrease

Discovery VoIP performance. Bandwidths lower than 256K and network latency higher than

120 ms may cause unacceptable performance. Intermittent fluctuating connections (i.e.,

some wireless broadband connections) will cause unacceptable performance problems.

Have your network administrator check your network performance and bandwidth to

determine your network constraints before installing the Discovery VoIP card.

Recommended Bandwidths

The following table shows the recommended and minimum bandwidths for use with

Discovery VoIP. The values are based on the number of ports.

Table D-1: Bandwidths

Voice Encoder Information

There are four built-in voice encoding standards (vocoders) in the Discovery VoIP card. The

most bandwidth-efficient standard is G.723.1 due to its compression technology. The highest

voice quality is provided by the G.711 standard (both A-law and U-law) because no

compression is used. The G.729 standard is between the G.723.1 and G.711 standards in

terms of bandwidth usage and performance. The G.729 standard loses some voice quality

due to the use of compression. The default vocoder standard is G.723.1 to conserve

bandwidth.

The Discovery VoIP card intelligently handles incoming VoIP calls by negotiating with the

initiating system to determine the preferred vocoder standard to use during that call. For

example, a system that is set for the default standard (G.723.1) can initiate a call with another

system set to the G.711 A-law standard. The entire call will be established with the G.723.1

standard. The same is true for a G.711 A-law system establishing a call with the G.723.1

system. In this case, the G.711 A-law standard will be used for that call. Lower bandwidth

connections, however, may be saturated when using the G.711 standards.

2 Ports 4 Ports 6 Ports 8 Ports

Recommended

512K 640K T1 T1

Minimum

256K 256K 512K 512K

Note: Assumes network latency is below 120 ms

1 2 ... 497 498 499 500 501 502 503 504 505 506 507 ... 625 626

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