How to configure SIP number can't talk

I use “meetme” to create meeting rooms.
I want only few numbers can tell and hear,a few others only hear but not talk,How do I have to configure?

PS.My english is very bad :mrgreen:

use the option s to mute or unmute.

Meeting room is 1111.I have 2 phone,2222 and 3333.
I want number 2222 can talk and hear, number 3333 only hear.How do I have to configure?