Group Call

1. Use the webex.rooms.create API to create a Room.

   webex.rooms.create(title: "Hello World") { response in
       switch response.result {
       case .success(let room):
           // ...
       case .failure(let error):
           // ...
       }
   }

2. Use the webex.memberships.create API to add people to the Room.

   webex.memberships.create(roomId: roomId, personEmail: email) { response in
       switch response.result {
       case .success(let membership):
           // ...
       case .failure(let error):
           // ...
       }
   }

3. Dial a room by room id to make a group call with all peoples in the room.

   webex.phone.dial(room.id, option: MediaOption.audioVideo(local: ..., remote: ...)) { ret in
       switch ret {
       case .success(let call):
           call.onConnected = {
               // This method is invoked on successful completion of connect.
           }
           call.onDisconnected = { reason in
               // ...
           }
           call.onCallMembershipChanged = { changed in
               switch changed {
               case .joined(let membership):
                   // A remote participant accept the call and connects to the Room.
               case .left(let membership):
                   // A remote participant hangup the call and leaves from the Room.
               default:
                   //
               }                
           }            
       case .failure(let error):
           // failure
       }
   }

4. In order to get the event of a participant in the call, the callback function onCallMembershipChanged is used.

   call.onCallMembershipChanged = { changed in
       switch changed {
       case .joined(let membership):
           print("The \(membership.email) accept the call and joins to the Room")
       case .left(let membership):
           print("The \(membership.email) hangup the call and leaves to the Room")
       case .declined(let membership):
           print("The \(membership.email) decline the call")
       case .sendingAudio(let membership):
           print("The \(membership.email) \(membership.sendingAudio ? "unmute" : "mute") voice")
       case .sendingVideo(let membership):
           print("The \(membership.email) \(membership.sendingVideo ? "unmute" : "mute") video")
       case .sendingScreenShare(let membership):
           print("The \(membership.email) \(membership.sendingScreenShare ? "start" : "stop") screen sharing")
       }
   }