Some words about glare
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@ -1249,7 +1249,33 @@ Or a rejected call:
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<------- m.call.hangup
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<------- m.call.hangup
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Calls are negotiated according to the WebRTC specification.
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Calls are negotiated according to the WebRTC specification.
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Glare
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-----
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This specification aims to address the problem of two users calling each other
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at roughly the same time and their invites crossing on the wire. It is a far
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better experience for the users if their calls are connected if it is clear
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that their intention is to set up a call with one another.
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In Matrix, calls are to rooms rather than users (even if those rooms may only
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contain one other user) so we consider calls which are to the same room.
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The rules for dealing with such a situation are as follows:
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- If an invite to a room is received whilst the client is preparing to send an
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invite to the same room, the client should cancel its outgoing call and
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instead automatically accept the incoming call on behalf of the user.
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- If an invite to a room is received after the client has sent an invite to the
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same room and is waiting for a response, the client should perform a
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lexicographical comparison of the call IDs of the two calls and use the
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lesser of the two calls, aborting the greater. If the incoming call is the
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lesser, the client should accept this call on behalf of the user.
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The call setup should appear seamless to the user as if they had simply placed
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a call and the other party had accepted. Thusly, any media stream that had been
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setup for use on a call should be transferred and used for the call that
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replaces it.
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Profiles
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Profiles
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========
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========
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