IP Networking
145
VARIABLE RTP PACKET RATES
MCD 4.0 introduced capabilities to support the use of variable RTP packet rates between specific
phones, applications and the 3300 ICP. Previously, RTP packet rates were fixed at 20 ms.
Currently, the 3300 ICP has only one means of connecting to service providers via IP
technology: over SIP Trunks. Some service providers of SIP trunks may require packet rates
that are not 20 ms. In this case the installer can select packet rates for SIP trunks other than
the default value of 20 ms. Alternatively, the installer can use an MiVoice Border Gateway at
the edge of the customer network to adapt packet rates to what the service provider requires.
The bandwidth used by the IP media streams will vary according to the packet rate value chosen.
Relative to current usage, bandwidth usage will rise by 27% when using a 10 ms packet rate
for G.711 and by 80% when using G.729, but will decrease if the packet size chosen is greater
than 20 ms. Chapter 11,
Bandwidth, Codecs and Compression
provides specific details on
bandwidth requirements to support SIP trunks with different packet rates.
The working packet rate should be a multiple of the working CODEC frame rate. Chapter 12,
Network Configuration Concepts
, provides specific details under the CODEC Selection heading
of CODEC frame rates.
MiVoice Business supports packet rates from 10ms to 80ms in steps of 10ms. MiVoice Border
Gateway goes up to 60ms (also in 10ms increments).
The following Mitel devices and applications will support variable RTP packet rates:
The 5302 SIP set will not fully support variable RTP packet rates. It is possible to configure a
5302 device to provide a non-default rate. However, if this is done the set will always provide
that packet rate, even on calls that do not include a SIP trunk to a service provider.
CONSTRAINTS
At this time, a limited number of 3rd-party phones and applications will be compatible with a
non-default (i.e. 20 ms) packet rate.
Since the 3300 ICP does not support rate adaptation between media streams using different
packet rates, it will not be possible to connect a media stream between two service providers
that require different packet rates through the 3300 ICP.
The MiVoice Border Gateway (Release 6.0 onwards) can provide packet rate adaptation
between the internal and external address interfaces. This can be used to provide a different
•
E2T
•
5302
•
5304
•
5215
•
5220
•
5212/24
•
5312/24
•
5235
•
5330/40
•
5550 IP Console
•
5560
•
MiVoice Border Gateway
(Teleworker)
•
Mobile Extension
Summary of Contents for MiVOICE BUSINESS
Page 1: ...Mitel MiVoice Business RELEASE 7 2 ENGINEERING GUIDELINES ...
Page 15: ...Chapter 1 ABOUT THIS DOCUMENT ...
Page 16: ......
Page 22: ...Engineering Guidelines 8 ...
Page 23: ...Chapter 2 SYSTEM OVERVIEW ...
Page 24: ......
Page 28: ...Engineering Guidelines 14 ...
Page 29: ...Chapter 3 TYPICAL CONFIGURATIONS ...
Page 30: ......
Page 73: ...Chapter 4 PHONES AND VOICE APPLICATIONS ...
Page 74: ......
Page 95: ...Phones and Voice Applications 81 Figure 9 ICP Connection Paths and Limitations ...
Page 100: ...Engineering Guidelines 86 ...
Page 101: ...Chapter 5 POWER ...
Page 102: ......
Page 128: ...Engineering Guidelines 114 ...
Page 129: ...Chapter 6 PERFORMANCE ...
Page 130: ......
Page 135: ...Chapter 7 APPLICATIONS ...
Page 136: ......
Page 142: ...Engineering Guidelines 128 ...
Page 143: ...Chapter 8 EMERGENCY SERVICES ...
Page 144: ......
Page 151: ...Chapter 9 IP NETWORKING ...
Page 152: ......
Page 167: ...Chapter 10 LICENSING ...
Page 168: ......
Page 183: ...Chapter 11 BANDWIDTH CODECS AND COMPRESSION ...
Page 184: ......
Page 209: ...Chapter 12 NETWORK CONFIGURATION CONCEPTS ...
Page 210: ......
Page 244: ...Engineering Guidelines 230 ...
Page 245: ...Chapter 13 NETWORK CONFIGURATION SPECIFICS ...
Page 246: ......
Page 309: ...Appendix A CAT 3 WIRING ...
Page 310: ......
Page 315: ...CAT 3 Wiring 301 Figure 55 CX MX MXe AX and LX Minimum Cable Standard ...
Page 316: ...Engineering Guidelines 302 ...
Page 317: ...Appendix B INSTALLATION EXAMPLES ...
Page 318: ......
Page 335: ...Appendix C LLDP AND LLDP MED CONFIGURATION EXAMPLES ...
Page 336: ......
Page 347: ...Appendix D VOIP AND VLANS ...
Page 348: ......
Page 353: ...Appendix E VOIP SECURITY ...
Page 354: ......
Page 381: ... ...