[OpenSIPS-Users] Number portability

[Alex Balashov]

Iñaki Baz Castillo wrote:
> El Viernes, 10 de Julio de 2009, Alex Balashov escribió:
>>> npdi and rp are *userinfo* parameters (in fact they are TEL URI
>>> paremeters so when converting to SIP URI they become part of the userinfo
>>> part). http://www.tech-invite.com/Ti-sip-abnf.html#teluri
>>>
>>> So, if the original RURI is:
>>>   sip:+12345678 at mydomain.org
>>>
>>> and OpenSIPS modifies it to:
>>>   sip:+12345678;npdi=123;rn=456 at mydomain.org
>>>
>>> then both RURI's are differents and the softsiwtch won't consider it a
>>> loop.
>>>
>>> However, if the parameters are added as SIP URI parameters (after the
>>> hostpart) the it would be a loop (except if they are maddr, user, ttl).
>> How does that change the other logical attributes of a call leg, i.e.
>> Call ID GUID, From tag, CSeq, etc?
> 
> If the RURI changes, then it's *not* a loop, but a spiral. Re-read the 
> appropiate section in RFC 3261 :)

Ah, I see.  I had just thought that something else must change also 
besides just the RURI to make a legitimate spiral.  Thank you and Victor 
for clarifying that.

-- 
Alex Balashov
Evariste Systems
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