[Bug 28707] Clarify how to use hold/mute with Call

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28707

--- Comment #18 from Olivier Crête <olivier.crete at ocrete.ca> 2011-04-04 11:50:41 PDT ---
I think the Mute stuff can be simplifieda but because I don't think muting can
fail.

Otherwise++

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