Endpoint Preconference Add 3rd Party
After a successful Supervised Conference request, bring the 3rd party back in to the current endpoint's conversation, i.e. remove hold from the 3rd party, which changes the conversation to a 3 party conference.
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Depending on the success of the operation
| 1. | Drop | Telephony error |
| 2. | Success | Adding 3rd party succeeded |
| 3. | No Add | Adding 3rd party failed |