External callers can be routed to a conference using a number of methods:
The conference ID appears as Conf:<id> in the Destination drop-down list for many functions:
From an Incoming Call Route, the Destinations drop-down includes system meet-me conferences configured on the system.
Through an auto-attendant, the configured conferences appear in the list of targets for Unsupervised Transfer actions.
Using the Dial By Conference action, callers routed to an auto-attendant can dial the conference ID required.
For other scenarios, the conference ID can be used as the number to which a call should be routed using the format *<ID>#. For example in the telephone number field of a short code.