[OpenSIPS-Users] Number portability

[Alex Balashov]

Brett is very right.   I think one of the reasons I reacted 
instinctively to this scenario was because I tried to implement 
something similar with a well-known switch once (I think it was a 
Metaswitch) and the signaling agent reacted to my "spiral" (which I 
didn't know to be such) as though it were a "loop."

Brett Nemeroff wrote:

> Just throwing this out.. Not all equipment can handle SIP Spiral 
> properly. <cough> asterisk <cough> (although I know there was work done 
> on Asterisk+SIP Sprial, I don't know where that ended up)
> 
> so be careful before you spend a lot of time on that.  I'd love to hear 
> how all of that works for you. I've got plans to do something similar in 
> the LNP space..
> -Brett
> 
> On Fri, Jul 10, 2009 at 2:02 PM, Iñaki Baz Castillo <ibc at aliax.net 
> <mailto:ibc at aliax.net>> 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
>     <mailto:sip%3A%2B12345678 at mydomain.org>
>      > >
>      > > and OpenSIPS modifies it to:
>      > >   sip:+12345678;npdi=123;rn=456 at mydomain.org
>     <mailto: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 :)
> 
> 
>     --
>     Iñaki Baz Castillo <ibc at aliax.net <mailto:ibc at aliax.net>>
> 
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-- 
Alex Balashov
Evariste Systems
Web     : http://www.evaristesys.com/
Tel     : (+1) (678) 954-0670
Direct  : (+1) (678) 954-0671