Iñaki Baz Castillo wrote:
2010/4/13 Timo Reimann timo.reimann@1und1.de:
Unfortunatelly I'm trying to figure out this solution and now I don't like it:
- Imagine there are two branches, both with 180.
- Both share the same "dialog_id" field in "dialog_out" table.
- Bob-1 replies 200. The second entry remains 3 seconds before being deleted.
- But before these 3 seconds Bob-2 also replies 200.
- Such 200 would match the second "dialog_out" entry, but then, how to
change its dialog_id field?? In the example it must change from "1111a" to "1111b".
Any suggestion for it? I leave it as TODO in the wiki for now.
What about this:
When the dialog module detects that a concurrent call is about to be confirmed, it copies that second call's dialog_out entry from the old location (1111a) to a new one (1111b). Afterwards, it creates a new dialog_in entry with the same hash ID (1111) but pointing to the new location (1111b). Along that process, it also copies the first call's dflags just like we have discussed before.
What did I miss at night-time?
It sounds Ok, but for this we must be really sure that, upon receipt of the first 200, the other pending branches are not immediately removed so the second 200 (after less than 1-2 seconds) would match an entry in dialog_out.
Agreed. Does the SIP standard specify the time interval for which another branch's 200 response must still conclude another (concurrently confirmed) call? Or is this time interval naturally bound to some standard-provided timer?
I've tried to figure that out from RFC 3261 but couldn't find anything.
Cheers,
--Timo