TANDBERG D14049.01 manual About the Default Call Bandwidth, About Downspeeding

Bandwidthth Controll

TANDBERG VIDEO COMMUNICATION SERVER ADMINISTRATOR GUIDE

About the Default Call Bandwidth

Usually, when a call is initiated the endpoint will include in the request the amount of bandwidth it wishes to use. For those cases where the endpoint has not specified the bandwidth, you can set the VCS to apply a default bandwidth value.

Default Call Bandwidth, Insufficient Bandwidth and Downspeeding

Configuring the Default Call Bandwidth and Downspeeding

The default call bandwidth and downspeeding behavior are configured via:

•VCS Configuration > Bandwidth > Configuration.

You will be taken to the Bandwidth Configuration page.

•xConfiguration Bandwidth Default

•xConfiguration Bandwidth Downspeed

About Downspeeding

If bandwidth control is in use, there may be situations when there is insufficient bandwidth available to place a call at the requested rate. By default (and assuming that there is some bandwidth still available) the VCS will still attempt to connect the call, but at a reduced bandwidth – this is known as downspeeding.

You can turn off downspeeding, in which case if there is insufficient bandwidth to place the call at the originally requested rate, the call will not be placed at all. In this situation users will get one of the following messages, depending on the message that initiated the search:

•Exceeds Call Capacity

•Gatekeeper Resources Unavailable

Downspeeding can be configured so that it is applied in either or both of the following scenarios:

•when the requested bandwidth for the call exceeds the lowest per-calllimit for the subzone or pipe(s)

•when placing the call at the requested bandwidth would mean that the total bandwidth limits for that subzone or pipe(s) would be exceeded.

Introduction	Getting	System	System	H.323 & SIP	Registration	Zones and	Call	Firewall
	Started	Overview	Configuration	Configuration	Control	Neighbors	Processing	Traversal
D 14049.01					119
07.2007

Default call bandwidth (kbps)

Enter the bandwidth value to be used for calls for which no bandwidth value has been specified.

This value cannot be blank. The default value is 384 kbps.

Downspeed per call mode

Determines what will happen if the per-callbandwidth restrictions on a subzone or pipe mean that there is insufficient bandwidth available to place a call at the requested rate.

On: the call will be downspeeded.

Off: the call will not be placed.

Downspeed total mode

Determines what will happen if the total bandwidth restrictions on a subzone or pipe mean that there is insufficient bandwidth available to place a call at the requested rate.

On: the call will be downspeeded.

Off: the call will not be placed.

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Bandwidth

Control Maintenance Appendices