The EVO video-collaboration tool has a facility whereby people may use a phone to connect to an EVO Meeting via audio only. This can be very handy when travelling, or when network or other issues preclude attending via EVO proper.
When one has joined the Meeting via the Phone Bridge (as it is called), one will hear the audio from all the other participants, and they will hear you.
To use the EVO Phone Bridge, follow these steps
Each EVO Meeting has a unique ID number. If a password has been set for the Meeting, it will also have a Phone Bridge password (actually a number). Thus, before being able to connect via the Phone Bridge, you will need to obtain the Meeting ID (and password/passnumber if required) from someone who has that information (such as the person who booked the Meeting, or someone who has EVO running and can see the Meeting information).
Note that it is possible to use EVO as a "hub" between muliple people joining via the Phone Bridge. This effectively makes an EVO Meeting into a conference call, but only at the cost of a local call for each participant (if they use a phone number which is local to their area). To do so, book an EVO Meeting and distribute the details to the intended participants. They can each then join the Meeting via the Phone Bridge, and have a multi-way phone conversation via the EVO Meeting's audio. The number of available lines is limited, so this approach cannot be scaled too far.
It is not actually necessary in this case for anyone to use EVO itself to join the Meeting, although this could provide a useful monitoring tool during the Meeting. Even if no-one joins the Meeting via EVO proper, the Meeting will open and the Phone Bridge can be used.
See here for further documentation on using the Phone Bridge.