How to make Avaya 9640 phone to work with 3CX?

[thanhmai96]

Does anyone know how to make Avaya 9640 phone to work with 3cx PBX? What firmware I should use: SIP or H323? This is the first time I have to deal with Avaya phones and I need your advise.
Thank you!

 

[mortenjorge]

Maybe this guide, will help you?

I see that the 9641G has a guide, so maybe your phone is like that one

https://www.3cx.com/sip-phones/avaya-ip-phone-provisioning/