* If params is NULL, then the same call parameters established before the update request will continue to be used (no change).
* If params is not NULL, then the update will be accepted according to the parameters passed.
* Typical example is when a user accepts to start video, then params should indicate that video stream should be used
* If params is NULL, then the same call parameters established before the update request will continue to be used (no change).
* If params is not NULL, then the update will be accepted according to the parameters passed.
* Typical example is when a user accepts to start video, then params should indicate that video stream should be used