ConfBridge Ad-Hoc Conference Rooms

Let users create instant conference rooms by dialing a star code and entering a room number. No pre-configuration needed, any room number works on the fly.

Dialplan

[features]
exten => *85,1,NoOp(Conference Bridge)
 same => n,Answer()
 same => n,Playback(conf-getconfno)
 same => n,Read(CONFNO,,4)
 same => n,GotoIf($["${CONFNO}" = ""]?invalid)
 same => n,ConfBridge(${CONFNO},default_bridge,default_user)
 same => n,Hangup()
 same => n(invalid),Playback(conf-invalid)
 same => n,Goto(*85,1)

Bridge Profile (confbridge.conf)

[default_bridge]
type = bridge
max_members = 10
music_on_hold_when_empty = yes
record_conference = no
internal_sample_rate = 8000
mixing_interval = 20
video_mode = none

User Profile (confbridge.conf)

[default_user]
type = user
announce_user_count = yes
announce_join_leave = yes
dtmf_passthrough = no
music_on_hold_class = default
admin = no
startmuted = no
; DTMF controls:
;   *1 = toggle mute
;   *4/*6 = decrease/increase listening volume
;   *7/*9 = decrease/increase talking volume

[admin_user]
type = user
admin = yes
marked = yes
announce_user_count = yes
announce_join_leave = yes

How it works

1. ConfBridge(room, bridge_profile, user_profile): The modern replacement for MeetMe(). Rooms are created dynamically when the first participant joins and destroyed when the last one leaves.
2. Read(variable, prompt, maxdigits): Reads up to 4 DTMF digits (allowing room numbers 1-9999). An empty input routes to the invalid label which loops back.
3. Bridge profiles: Control room-level settings: max participants, recording, sample rate, music on hold for the first caller.
4. User profiles: Control per-participant behavior: join/leave announcements, mute state, DTMF controls. The admin profile adds the ability to kick users and lock the room.
5. No PIN required: This is an open conference. For PIN-protected rooms, add Read(PIN,,6) and validate before entering the bridge.

Tips

• Add a PIN: same => n,Read(PIN,,6) then same => n,GotoIf($["${PIN}" != "1234"]?invalid) before ConfBridge().
• Use marked = yes with wait_marked = yes on the default_user to make participants wait until a moderator (admin) joins.
• Monitor active conferences from the CLI: confbridge list and confbridge show default_bridge.
• Record conferences by setting record_conference = yes in the bridge profile. Recordings go to /var/spool/asterisk/confbridge/.
• For external callers to join, add a DID route: exten => 15085559999,1,ConfBridge(9999,default_bridge,default_user).