T58w Pro as Main phone, which one for other office rooms

[paiam]

Dear all,

we have a T58w pro for our main room in office, which phone is recommended for the other 5-6 rooms we have ?
they should be mobile stations, like this one for example

https://www.google.com/url?sa=i&url=http...AdAAAAABAE

it should have the option to reach the other rooms by dialing a single number.

Thanks in advance