Cascading Conferences
Polycom®, Inc. 189
Automatic Identification of the Cascading Link
The system automatically identifies that the dial in participant is an MCU and creates a Cascading Link and
displays the link icon for the participant ( ). The master-slave relationship is randomly defined by the
MCUs during the negotiation process of the connection phase.

System Flag Settings

The DTMF_FORWARD_ANY_DIGIT_TIMER_SECONDS flag determines the time period (in seconds) that
MCU A will forward DTMF inputs from conference A participants to MCU B.
Once the timer expires, most of the DTMF codes (excluding five operations as for IP links) entered in
conference A will not be forwarded to conference B. This is done to prevent an operation requested by a
participant individually (for example, mute my line) to be applied to all the participants in conference B.
Flag range (in seconds): 0 - 360000
This flag is defined on MCU A (the calling MCU).
If a flag is not listed in the System Flags list it must be added before it can be modified. For more details on
defining system flags, see Modifying System Flags.