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# Stream Service Types

String constants that specify the service type of a stream.

## Topics

### Constants

  <doc://com.apple.documentation/documentation/CFNetwork/kCFStreamNetworkServiceTypeVoIP>

  <doc://com.apple.documentation/documentation/CFNetwork/kCFStreamNetworkServiceTypeVideo>

  <doc://com.apple.documentation/documentation/CFNetwork/kCFStreamNetworkServiceTypeBackground>

  <doc://com.apple.documentation/documentation/CFNetwork/kCFStreamNetworkServiceTypeVoice>


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