[pjsip] SIP SIMPLE for GAMES

Klaus Darilion klaus.mailinglists at pernau.at
Mon Apr 28 03:43:09 EDT 2008

Thomas Plotkowiak schrieb:
> First the question:
> Is it theoretically possible to get a list of all available users on a 
> given REGISTRAR, assuming we own the REGISTRAR?

Not by using standard SIP protocol. Actually I would not do this in SIP 
at all, but would use an http request to retrieve this data from the server.


> Then the background:
> I am thinking of using SIP SIMPLE with a REGISTRAR like OPENSER as a 
> Client-Server Game Architecture. SIP SIMPLE Messeging is used to 
> exchange relevant game state information, and the SUBSCRIBE/NOTIFY 
> service to figure out who is part of the game.
> But for an initial boot-strapping setup I would need to transfer the 
> current list of users of the game to the new client. Then the client can 
> take over and subscribe the presence information of those users. In case 
> a new person enters the game the registrar should be able to update the 
> players about a new user.
> Assuming that getting a list directly from the registrar I thought of 
> running a client UA on the same REGISTRAR machine who is the entry point 
> to the game:
> - every time a new player wants to connect has to connect to this 
> Central UA running on the REGISTRAR machine.
> - This central UA adds the new player to his buddy list.
> - Then he sends the new player his current buddy list.
> - Then he sends a this new buddy address to everybody in his buddylist.
> Once a client is set up, he sends update information about his state to 
> every online buddy on his received list.
> What do you think of this? Is that raping the SIP SIMPLE protocol?
> Cheers
> Thomas
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