Via station-controlled conferences, Telephony Control Server users can stage a conference with a total of 48 participants. The maximum number of conference participants can be restricted by the performance of the Media Server used or by creating the Business Group Service. With the Media Server you can use the maximum number of conference participants. Station-controlled conferences are set up as required (ad-hoc). The participants of a station-controlled conference can be members of the same or of different business groups or be participants in the public network.
The Media server has the task of mixing the media streams. If required, it also takes on the transcoding job – e. g. from G.729 to G.711. This transcoding ensures that conference participants can hear each other even if the involved devices use different codecs for the media streams.
Station-controlled conferences can be provided on business group level with a prohibition option on participant level.
Please refer to the description of the SIP devices to learn which SIP devices support station controlled conferences.
The device Openstage 60/80 shows a list of all participants during a station-controlled conference. This list is automatically updated as soon as members join or leave the conference and contains the name and phone number of each participant. The phone number is displayed in a dialable format.
Categorization of conference participants / participants
Conference participants or participants in station-controlled conferences can be categorized as follows:
Conscious and unconscious conference participants
A conscious conference participant is aware of the current phone call being a conference call. A conscious conference participant can be an active or passive participant (see the following categorization).
An unconscious conference participant is unaware of the current phone call being a conference call. To him/her it is a simple point-to-point connection. Unconscious conference participants are always passive participants (see the following categorization).
Active and passive participants
An active participant can invoke extended functions related to the conferencing feature; for example, he/she can initiate a conference and add further participants. Active participants are always conscious conference participants. They must belong to the same business group as the conference initiator and be registered for the conference feature.
A passive participant can talk to other conference participants but cannot invoke any advanced functions in the conference feature context. Passive participants can either be conscious or unconscious conference participants. Members of other business groups and participants in the public network are always passive participants.
Use of a station-controlled conference
To set up the conference the user first initiates two calls (a held and a consultation call) and pushes the Conference key. This user is a conscious conference participant and active participant. Depending on the additional features assigned to the other participants, these participants can:
Hold calls. Conscious conference participants can also stop music from being played during the conference.
Toggle held and active calls.
If the conference participant is active and conscious:
Add another participant to the conference. You find more information in the corresponding user manual.
In case of OpenStage phones: Displaying a conference participants list that can be browsed. The display is automatically updated as soon as participants join or leave the conference.
Remove the participant who joined last by dialing the corresponding prefix access code.
This feature is commonly used when a user has inadvertently added an unwanted or unavailable participant to the conference. To cut and re-establish the connection to all conference participants only for removing an unwanted one is thus not necessary.
The system administrator defines the access code to be used for removing the participant who joined last.
Restrictions on Subscribers in Station-controlled Conferences
By Toll and Call Restrictions a subscriber may be restricted to call other selected parties.
Station-controlled conferences can be configured to be automatically released, when in the case of two parties remaining in conference, one party is restricted by Toll and Call Restrictions from calling the second party. This setting is business-group-related.
Technical Restrictions on Station-controlled Conferences
A conference participant may only take part in several conferences using the same phone number if he/she does not use an Telephony Control Server participant for this purpose.
The configuration of an SIP endpoint decides whether station-controlled conferences are available for this endpoint or whether three-way conferences must be used instead. We recommend to configure endpoints for station-controlled conferences. This ensures consistent operation under all users.
Configuration of station-controlled conferences
The configuration of station-controlled conferences is performed in three steps:
Section 1: How to activate station-controlled conferences
Step 2: How to configure the access code
Step 3: How to configure station-controlled conferences for participants via feature profile
The default set RTP parameters of the system environment used may have to be subsequently adjusted.
Parent topic: Conferences