On Monday 12 September 2005 19:45, Dean Willis wrote:

> Are you just being difficult (like the IMS
> people who actually have a transitive authentication mechanism keyed
> off REGISTER that they built that way BECAUSE they got SIP REGISTER
> confused with GSM Registration -- after all, the names are very
> similar)

:-)

few reasons of the top of my head that the IMS probably chose to do this:

 * to assign an S-CSCF to the user, which is needed for further messages
 * for grabbing the filter criterion from the HSS, which are needed to route
   further messages.
 * roaming, where the P-CSCF is located in a visited network - for ensuring 
   the user is allowed to roam with that identity.

I initially thought "what the hell" when reading through the IMS spec, but am 
now starting to appreciate the reasons things have been done the way they 
have while deploying a scarily large SIP network while keeping resources to a 
sane level

thoughts? (maybe offlist :))

 ~ Theo, not related to the IMS in any way other than implementing it :)

-- 
Theo P. Zourzouvillys

People who enjoy waiving flags don't deserve to have one
  -- Santa's Ghetto 2004, Banksy
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