CFStreamCreatePairWithSocketToHost(NULL, ( CFStringRef)hostURL.host, port, &readStream, &writeStream); CFReadStreamSetProperty(readStream, kCFStreamNetworkServiceType, kCFStreamNetworkServiceTypeVoIP); CFWriteStreamSetProperty(writeStream, kCFStreamNetworkServiceType, kCFStreamNetworkServiceTypeVoIP); inputStream = ( NSInputStream *)readStream; outputStream = ( NSOutputStream *)writeStream;