CFSocketContext socketCtxt = {0, self, NULL, NULL, NULL};
CFSocketNativeHandle ffsocket = (CFSocketNativeHandle)_socket;
//CFSocketRef socket = CFSocketCreateWithNative(kCFAllocatorDefault, ffsocket, kCFSocketDataCallBack, (CFSocketCallBack)SocketCallBack, &socketCtxt);
CFSocketRef socket = CFSocketCreateWithNative(kCFAllocatorDefault, ffsocket, kCFSocketReadCallBack, (CFSocketCallBack)SocketCallBack, &socketCtxt);

CFRunLoopSourceRef source = CFSocketCreateRunLoopSource(NULL, socket, 0);
//CFRunLoopRef loop = CFRunLoopGetMain();
CFRunLoopRef loop = CFRunLoopGetCurrent();
CFRunLoopAddSource(loop, source, kCFRunLoopDefaultMode);

CFReadStreamRef readStream = NULL;

CFStreamCreatePairWithSocket(kCFAllocatorDefault, ffsocket,
                             &readStream, nil);

Boolean ret = CFReadStreamSetProperty(readStream, kCFStreamNetworkServiceType, kCFStreamNetworkServiceTypeVoIP);
NSInputStream *inputStream = (NSInputStream*)readStream;
[inputStream setProperty:NSStreamNetworkServiceType forKey:NSStreamNetworkServiceTypeVoIP];
//[inputStream setProperty:NSStreamNetworkServiceTypeVoIP forKey:NSStreamNetworkServiceType];

[inputStream setDelegate:self];
//[inputStream scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
[inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

[inputStream open];

CFReadStreamOpen(readStream);