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| -rw-r--r-- | docs/specification.rst | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/docs/specification.rst b/docs/specification.rst index b15792c00d..aad200c04d 100644 --- a/docs/specification.rst +++ b/docs/specification.rst @@ -1249,7 +1249,33 @@ Or a rejected call: <------- m.call.hangup Calls are negotiated according to the WebRTC specification. - + + +Glare +----- +This specification aims to address the problem of two users calling each other +at roughly the same time and their invites crossing on the wire. It is a far +better experience for the users if their calls are connected if it is clear +that their intention is to set up a call with one another. + +In Matrix, calls are to rooms rather than users (even if those rooms may only +contain one other user) so we consider calls which are to the same room. + +The rules for dealing with such a situation are as follows: + + - If an invite to a room is received whilst the client is preparing to send an + invite to the same room, the client should cancel its outgoing call and + instead automatically accept the incoming call on behalf of the user. + - If an invite to a room is received after the client has sent an invite to the + same room and is waiting for a response, the client should perform a + lexicographical comparison of the call IDs of the two calls and use the + lesser of the two calls, aborting the greater. If the incoming call is the + lesser, the client should accept this call on behalf of the user. + +The call setup should appear seamless to the user as if they had simply placed +a call and the other party had accepted. Thusly, any media stream that had been +setup for use on a call should be transferred and used for the call that +replaces it. Profiles ======== |