We have updated V22 to support a special feature: conference call in one-number service. This feature is used in a classroom scenario:
Some students will be assigned with same number (of course, one number, remember?). Teacher will ask one of them to answer questions. During this process, other guys can pick up the call to join their discussion.
In MSS, the user who want to join call can dial “*74” to do that by default.
When developing this feature, we think about previous “virtual conference room” feature. We believe this feature is too complex to use and few people like it, so we decide to cut it from V22 and abover versions. In future, we will plan to develop a new three parties conference service.