atcomsystems.ca/forum Forums TDM Business Telephone Systems Avaya - Lucent Telephones & Systems Transfer/Forwarding Calls

I am trying to transfer an incoming call (1) using my main Avaya phone (2) to an outside phone number (3)

I've tried using the flash, transfer and conference features but I always lose the 3rd party when I hang up the main phone.
Does anyone know how to do this?
thank you in advance
pmh