[[XHClient sharedClient].voipManager addDelegate:self];

/*
 *Receive a call
 * @fromID the ID of who calls
 */
- (void)onCalling:(NSString *)fromID
{
}
/*
 *The other side has hung up
 * @fromID the other side ID
 */
- (void)onHangup:(NSString *)fromID
{
}
/*
 *the other side has canceled the call
 * @fromID the other side ID
 */
- (void)onCancled:(NSString *)fromID
{
}
/*
 *The call has been refused
 * @fromID the other side ID
 */
- (void)onRefused:(NSString *)fromID
{
}


/*
 *the other side is busy now
 * @fromID the other side ID
 */
- (void)onBusy:(NSString *)fromID
{
}
/*
 *the other side has been connected now
 * @fromID the other side ID
 */
- (void)onConnected:(NSString *)fromID
{
}
/*
 *Connection error
 * @error error information
 */
- (void)onError:(NSError *)error
{
}
/*
 * Hang up successfully,and you can close the connection normally
 * @code stop information
 */
-(void)onStop:(NSString *)code
{
}

/**
 * Missed calls during a call
 * @fromID the other side ID
 */
-(void)onMiss:(NSString *)fromID;

/**
 Set video parameters
 
 @param config config parameters
 */
- (void)setVideoConfig:(XHVideoConfig *)config;

/**
 Switch camera direction
 @return Camera orientation after switching
 */
- (XHCameraDirection)switchCamera;

/*
 *Set up your own and the other side's video view
 @param selfPreview Preview 
 @param targetView target view
 */
- (void)setupView:(UIView *)selfPreview targetView:(UIView *)targetView;

// --- Caller ---

/**
  Start a video call
  @param toID The called user ID
  @param completion Callback
  */
- (void)call:(NSString *)toID completion:(void(^)(NSError *error))completion;

/**
 cancel the video call
 @param toID the cancelling target
 @param completion callback
 */
- (void)cancel:(NSString *)toID completion:(void(^)(NSError *error))completion;

// --- callee ---

/**
 Accept a video call
 @param fromID caller ID
 @param completion callback
 */
- (void)accept:(NSString *)fromID completion:(void(^)(NSError *error))completion;

/**
 Refuse a video call
 @param fromID caller ID
 @param completion callback
 */
- (void)refuse:(NSString *)fromID completion:(void(^)(NSError *error))completion;

// --- Both sides ---

/**
 Hang up the video call
 @param fromID the user ID who wants yo hange up  
 @param completion callback
 */
- (void)hangup:(NSString *)fromID completion:(void(^)(NSError *error))completion;

/**
 * Switch audio
 @param enable switch
 */
- (void)setAudioEnable:(BOOL) enable;

/**
 * Switch video
 @param enable switch
 */
- (void)setVideoEnable:(BOOL) enable;