Specifications

MBG Engineering Guidelines, Release 8.0
commerce) must be provisioned as well. Failure to provide sufficient bandwidth for all Internet activities may
compromise the quality of service provided by the Mitel Border Gateway.
The table below shows examples of bandwidth required for various types of remote media streams.
Voice If compression (G.729a) enabled: 24 Kbps (bi-directional)
If compression not enabled (G.711): 80 Kbps (bi-directional)
MCA Collaboration 192 Kbps (bi-directional)
UCA Video 256 Kbps – 1600 Kbps (bi-directional)
UC360 Video 512 Kbps – 1500 Kbps (bi-directional)
Table 1: Bandwidth requirements of a single remote teleworker device
This table does not consider bandwidth requirements for PCs or other devices, which must be provisioned in
addition to the IP Phone. If there is insufficient bandwidth, symptoms experienced by the IP phone user may
include degraded voice quality, slow response, service interruption or loss of service. It also does not consider
bandwidth requirements for additional applications. Please see the section Additional Application Requirements
for more information.
Note: A video call requires 10 to 20 times more bandwidth than a compressed audio call even when
configured with the lowest bandwidth settings.
A remote UC360 connecting to MBG over the Internet should be configured to disable the H.264 High Profile
codec and to disable the Dynamic Bandwidth Allocation option. A video conference should not be initiated from a
UC360 on the Internet because it would serve as a bridge and dramatically increase bandwidth requirements for
the call.
Video calls between UCA 6.0 and UC360 2.0 are supported through MBG but they do not negotiate bandwidth at
the time of writing. For example, a UCA client on the Internet will receive video at the rate configured on a
UC360 on the LAN even if the UCA is configured to use low bandwidth. This will be rectified in a future release of
UCA and/or UC 360.
MCA voice and video conferencing between MCA clients via the MCA server is also supported through MBG.
The bandwidth usage per video stream is configurable on the MCA client. An additional consideration is that an
MCA client can receive multiple video streams, one for each video participant in the conference. That number
can be reduced at the MCA client by minimizing or closing video windows.
For details and current values, please see the engineering guidelines for the devices/applications referenced as
examples here (available from http://edocs.mitel.com/).
Bandwidth Usage and ISP Quotas
Many Internet Service Providers set quotas on the amount of IP bandwidth per month. As an aid in predicting
whether a specific quota will be exceeded, this section provides the necessary data and a sample calculation.
Assumptions:
• Signaling channel requires 1 KByte per minute (average), based on 6 calls per hour, business usage, 15
minutes per hour
• Options keepalive and Gap registration enabled for SIP, at 20s and 300s respectively
20