Stream Mixxx headphone output via IceCast

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http://askubuntu.com – Just like the title. Is it possible to configure Mixxx and Icecast in such a way that the headphone output is streamed? (Instead of the master output) How? My laptop has only one sound card. I thought, maybe it's possible to connect my phone (via icecast?) to the headphone output. That way, I can use my phone's output (by listening to the Icecast stream) to pre-listen and use the laptop audio out as master. I don't think doing the opposite (master over icecast on the phone, pre-listen via the laptop audio out) would be such a great idea, as streaming is inherently unreliable and I don't wan (HowTos)