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Chapter 5-Cascading Conferences
Polycom, Inc. 5-3
This option is supported with:
— In H.323, SIP environments.
— For Basic Cascading of Continuous Presence, aconferences. If a Master MCU has two
slave MCUs, participants connected to the slave MCUs will not receive video from
each other.
— Video resolution will be according to the Resolution Configuration.
For more details on defining system flags, see "Modifying System Flags” on page 20-1.
DTMF Forwarding
When two conferences are connected over an IP link, DTMF codes from one conference are
not forwarded to the second conference with the exception of the following operations that
are available throughout the conference and the forwarding of their DTMF codes is not
suppressed (i.e. they will apply to both conferences):
• Terminate conference.
•Mute all but me.
•Unmute all but me.
• Secure conference.
• Unsecure conference.
Play Tone Upon Cascading Link Connection
The Collaboration Server can be configured to play a tone when a cascading link between
conferences is established. The tone is played in both conferences.
This tone is not played when the cascading link disconnects from the conferences.
The tone used to notify that the cascading link connection has been established cannot be
customized.
The option to play a tone when the cascading link is established is enabled by setting the
System Flag: CASCADE_LINK_PLAY_TONE_ON_CONNECTION to YES.
Default value: NO.
The tone volume is controlled by the same flag as the IVR messages and tones:
IVR_MESSAGE_VOLUME.
Basic Cascading
In this topology, a link is created between two conferences, usually running on two different
MCUs. The MCUs are usually installed at different locations (states/countries) to save long
distance charges by connecting each participant to their local MCU, while only the link
between the two conferences is billed as long distance call.
• When linking two conferences using an IP cascading link:
— The destination MCU can be indicated by:
•IP address
•H.323 Alias
— Both MCUs must be located in the same network.
• One MCU can be used as a gateway.
During cascading between a gateway and a conference all DTMF codes are forwarded from the
gateway to the conference and vice versa.