Same Extension on Multiple Phones

[jarvisswope (computerguy2907)]

Why are you wanting to use the same ext for multiple phones. Just create a ring group and add all the phone in them or use shared lines.

Question about using multiple IP phones for the same extension?

i know if use device and user mode, multiple phones can share the same extension, but all the phones are registered by the same account. now i want multiple phones share the same extension, and all the phones are independently of each other. they just use the same extension number. just like: i have a extension number 2001 in two or more company（A and B and …）. but they can not influence each other. they just have the same extension number.