[Bug 53818] Allow clients to control their capabilities from being always advertised

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=53818

--- Comment #7 from Simon McVittie <simon.mcvittie at collabora.co.uk> ---
> If a capability of a handler is disabled by user, there will be
> no incoming channel requests for it in the first place. Even if
> they are (by some buggy client)

Slight technical correction here: the client doesn't necessarily even have to
be buggy.

In XMPP Jingle, there is an implementation detail that it is difficult to make
a VoIP call to someone whose capabilities you don't know, because you don't
know which of the four incompatible dialects of Jingle they understand: you
have to choose one of those dialects and hope they do.

Now that "real Jingle" is standardized and increasingly widespread, it would be
nice to have the ability to make a speculative VoIP call to an "offline"
contact in the hope that they are actually just invisible, and might answer
anyway.

In SIP, there are no capabilities (and, in the feature-set we implement, no
presence): you just have to assume that everyone does support VoIP (and is
currently online), try calling them, and see what happens.

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