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Chapter 5 - Monitoring Conferences
5-56
participant's properties dialog box nor was it set for the conference (if the
conference is Restricted, a special indication appears in the Local
Communication Mode list). In such a case, you may need to change the
participant and conference definition to Restricted or change the
conference video session to Transcoding.
Connecting Auto-Detect Participants
When a participant defined as Auto Detect dials into the MCU, each channel
is detected by the MCU and the system tries to connect the participant using
the Bonding protocol. If the connection using Bonding is successful, the
negotiation with the endpoint communicates the number of additional
channels to be connected. The connection of the participant proceeds using
the same procedure for Bonding connection. If the connection using Bonding
fails, the MCU tries to connect the endpoint using the H221 standard. If this
fails, the connection with the endpoint is terminated. If the capabilities
exchange is successful, the endpoint is connected according to the line rate
communicated by the endpoint during the capabilities exchange, and using
the standard H.221 aggregation procedure. These negotiations and the final
transmission rate are indicated in the Participant Properties - H221 dialog
box.
When a dial-out participant connects to the conference, the system exchanges
capabilities with the endpoint and attempts to connect the participant using
Bonding. If Bonding is unavailable, the participant is connected in H.221
mode. Once the aggregation method is determined, the MCU attempts to
connect the participant in the line rate defined for the conference. If it fails,
the MCU will connect the participant using a lower line rate.
The Bonding option is enabled for the MCU in the “system.cfg” file. The Default
setting is BONDING = YES
• The Bonding Yes/ No flag (in “system.cfg”) enables the system administrator
to disable the “Bonding” option when this feature is not required by the
system. If BONDING=NO, the system rejects all ISDN participants (except
participant using leased lines) whose aggregation mode is set to “Bonding,”
“Auto” or “Auto Detect” at the reservation stage. In such a case, an
appropriate error message is displayed: ”BONDING_NOT_SUPPORTED”.
• When the Bonding fails and the H.221 is selected, there may be problems
connecting the participant if the operator entered only one dial number and
the participant’s line rate is higher than 2B (128 Kbps).