[asterisk-users] MeetMe: Mute All Lines Automatically?

[Marc Charbonneau]

On Mon, Jun 8, 2009 at 9:18 AM, Christopher
Stamper<christopherstamper at gmail.com> wrote:
> I'm considering implementing an Asterisk PBX for conferencing. Before I get
> started, I wanted to make sure that it supports the features that I need.
>
> I plan to use Asterisk as a conference bridge only. I want people to be able
> to use my conference to listen live to lectures/etc, without having to
> listen to others in the conference.

have a look at the documentation here :
http://www.voip-info.org/wiki/view/Asterisk+cmd+MeetMe

you want this option
'm' — set monitor only mode (Listen only, no talking)

hth