Question regarding Mitel 4150 conferencing feature, Urgent

[TNCW]

Have a very general question regarding the Mitel 4150 phone. Could someone help me on this.
I am not really familiar with Mitel phone system. But the Mitel 4150 phone has the ability to start a 3-way conference. So are the conference parties only limited to local extensions? or it can conference with any number the phone calling? like an external phone number or a cell phone number etc.

[acejavelin]

Well, this would depend on the phone system more than the phone itself... But all of them allow for a 3-way conference... The parties being internal or external is not relevant, you should be able to conference yourself and one or two outside parties.

[TNCW]

Great news. Thank you for sharing your knowledge!