
360 Chapter 36 Private networking: MCDN and ETSI network features
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ISDN Call Connection Limitation
The ICCL feature piggybacks on the call initiation request and acts as a check at transit PBX
points to prevent misconfigured routes or calls with errors from blocking channels.
To configure ICCL
1 To access the Private Network panel, select Configuration > Telephony > Dialing Plan.
2 Locate the Private Network/MCDN subpanel.
3 Select the Network ICCL check box.
4 To access the Telephony Resources panel, select Configuration > Resources.
5 From the Modules table, select the required module.
6 Locate the Details for Module subpanel.
7 Click the Trunk Module Parameters tab.
8 Enter the Maximum transits in the Maximum transits field.
Trunk Route Optimization (TRO)
TRO finds the most direct route through the network to send a call between nodes. This function
occurs during the initial alerting phase of a call.
To enable TRO
1 Click Configuration > Telephony > Dialing Plan.
2 Locate the MCDN subpanel.
3 Select the TRO check box.
Trunk Anti-tromboning (TAT)
TAT is a call-reroute feature that works to find better routes during a transfer of an active call. This
feature acts to prevent unnecessary tandeming and tromboning of trunks.
To enable TAT
1 Click Configuration > Telephony > Dialing Plan.
2 Locate the MCDN subpanel.
Note: TAT is not applicable for alerting calls.
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