adynes,
Yes, Conference, Conference is how you join everyone together and Mitel's documentation is not easy to understand; nor accurate.
Placing Ad Hoc Conference Calls (Internal)
1. While on the first call, perform a hookflash, and then dial 5.
2. Place another call, and then hookflash, and then dial 5.
3. Perform another hookflash, and then dial 5 again to join all of the calls together in the conference.
Placing Ad Hoc Conference Calls (External) <-- This is more like how a Transfer is handled not a conference call.
1. While on the first call, perform a hookflash. You hear two short tones.
2. Select an outgoing line and dial the number. If desired, wait for an answer and announce the call.
3. Hang up. If the number is busy, there is no answer or the transfer is refused, hookflash twice to return to the caller.
So, dial 8 make a call, press hookflash, wait for tone, press 5, dial 8 make a call, press hookflash, wait for tone, press 5, hookflash, wait for tone, press 5; all callers are now talking to one another. This is how I did it on my local phone system and it worked without a problem, but I am just using a normal analog phone and pressing the hookflash.
Internal calls won't give the double tone so you don't have to wait for them.
Thanks,
TE