System/Library/PrivateFrameworks/TelephonyUtilities.framework

TUMutableParticipant.h

NSObject
>
TUParticipant

@class NSURL, NSString;

@interface TUMutableParticipant : TUParticipant

@property (retain, nonatomic) NSURL *imageURL;
@property (copy, nonatomic) NSString *name;

@end