用于主叫的呼叫邀请内容

@property (nonatomic, copy, nonnull) NSString *calleeId;

@property (nonatomic, copy, nullable) NSString *content;

@property (nonatomic, copy, nullable, readonly) NSString *response;

@property (nonatomic, copy, nullable) NSString *channelId;

@property (nonatomic, assign, readonly) ARtmLocalInvitationState state;

- (instancetype _Nonnull)initWithCalleeId: (NSString * _Nonnull) calleeId;