The Assistant voice technology buried in the iOS 5 firmware will be largely dependent on Siri technology, not Nuance's, a report suggests. The codebase, including a portion that asks to "authenticate with Siri server," is said to show that Nuance's technology will only be used for voice recognition and speech-to-text functions. The core of Assistant is believed to be the Siri technology, which will actually translate voice commands into system functions.