On 8/30/12 3:58 PM, Olle E. Johansson wrote:
30 aug 2012 kl. 11:42 skrev Daniel-Constantin Mierla <[email protected]>:
On 8/30/12 11:22 AM, Iñaki Baz Castillo wrote:
2012/8/30 Olle E. Johansson <[email protected]>:
AFAIK that's not "needed". When a request arrives to the proxy having
;gr param in the RURI, the proxy extracts the gr value, "decodes" it
somehow (not need to have such a mapping in a DB) and gets the
associated binding, so just such a binding would be retrieved form
usrloc table when calling lookup().
That means that one - knowing the algorithm - can reach all contacts directly,
regardless
if they have a gruu or not. Or?
I expect that Kamailio generates a random key on startup for encoding
GRUU values and thus, it would be not possible to generate the same
GRUU value (for the same URI binding) without having such a key.
A random key at startup is making impossible to deal with gruu values in the
ongoing dialogs, because there was an encoding key before startup and another
one after, which is not able to decode previously encoded values.
Anyhow, the algorithm is known, because it is open source, but unique id
generation is taking in consideration server id, startup time, pid, a counter
or random (depending on option, for gruu is counter) and hash over AoR. All
together results in a very random value, where another encoding makes no much
sense.
This is for temp gruu, because for public gruu the rfc recommends usage of
instance value, which is set by client.
- If so, is that reachable information for the pua-regloc to publish the gruu's?
Note that such a feature would require implementing RFC 5628:
http://tools.ietf.org/html/rfc5628
"Registration Event Package Extension for SIP
Globally Routable User Agent URIs (GRUUs)"
Yes. But to make it possible and to make it possible to restart kamailio
without loosing information, I think we have no other option but to store a
gruu flag in usrloc.
I see no problem at all in adding two new fields to the usrloc table:
gr_public, gr_temp.
There is no need, the values for these fields are in the other fields. If the
client does not support gruu, the instance is not published, so it is stored.
Instance alone is not an indication of gruu support.
it's the other way for usrloc, no instance is indication of no gruu
support. If a flag could help somewhere, is fine to store, but storing
temp/pub gruus is just duplicated data.
Cheers,
Daniel
--
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio Advanced Training, Berlin, Nov 5-8, 2012 - http://asipto.com/u/kat
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