Not possible to dial into breakout rooms via telephohe

[lekker-xr]

Describe the bug
It is not possible to go into breakout rooms via telephone:

• Moderators can not move dialed-in participants,
• in the breakout room, there is an access pin displayed to enter the breakout room. So: The telephone participant has to
  • hang up,
  • dial the phone number again,
  • enter that acces pin.
    The Problem is: That access pin, 6 digits long, equals the 5-digits access pin to the meeting, with one digit appended. But the BigBlueButton-Server will already add the participant to the main conference when the 5 digits were entered, without a possibility to wait for the 6th digit.
    And also, hanging up and dialing in again is a bit too complicated (and in some setups may be problematic).

To Reproduce
Steps to reproduce the behavior:

1. Start a meeting,
2. open a breakout room,
3. note the telephone dial-in number and PIN,
4. dial the noted phone number,
5. enter the noted pin,
6. find yourself in the main room and not the breakout room.

Expected behavior

6. Find yourself in the breakout room.

Actual behavior

6. Find yourself in the main room instead of the breakout room.

Screenshots

Desktop (please complete the following information):

• OS: Artix/ Arch Linux
• Browser: ungoogled-chromium
• Version: 81.0.4044.122 (Developer Build) Arch Linux (64-bit)

(But I see this in this case not of relevance)

Additional context
Note that I do not maintain the server instance; the maintainer did point me to here to post the issue.
Related feature request: [Issue 9480: "Enable phone users to be moved to breakout rooms by moderators, or by themselves without re-dialing."].

[schrd]

the cause is the dial plan. The dial plan expects a 5 digit pin number. You can change the dial plan like

<action application="play_and_get_digits" 
   data="5 6 3 7000 # conference/conf-pin.wav ivr/ivr-that_was_an_invalid_entry.wav pin \d+"/>

You might want to change the spoken text, to give the users the hint that they can finish the pin by a pound key to prevent waiting 7 seconds for the sixth digit

<action application="play_and_get_digits" 
   data="5 6 3 7000 # ivr/ivr-please_enter_pin_followed_by_pound.wav ivr/ivr-that_was_an_invalid_entry.wav pin \d+"/>

[rasos]

We stumbled across the same issue and applied 7 digits (because we have organizers who create 25 breakout rooms) and reduced input time to 4 seconds, until the invalid message is repeated. Announcing prssing the pound key is not so easy if voice files are not localized, and it is not really necessary.

<action application="play_and_get_digits" data="5 7 3 4000 # conference/conf-pin.wav ivr/ivr-that_was_an_invalid_entry.wav pin \d+"/>

To activate changes in the dialplan (without restarting BBB): /opt/freeswitch/bin # ./fs_cli -x "reloadxml"

Take care that at least one user is present with an active microphone #9161