[SIPForum-discussion] SIP to ISUP mapping

[Nikos Leontsinis]

There is another approach endorsed by the i3forum (the wholesale carriers)
 and 3GPP TS29.163
you can download the document here:
http://i3forum.org/sites/default/files/i3F%20-%20Technical%20White%20Paper%20on%20Signalling%20Mapping%20Release%203%20FINAL%20(2011-05-5)-1.pdf

One interesting action item for the sip forum or the i3forum  could be to
gather data about which company has adopted which scheme and present  the
experiences from each approach.
I agree that it is a mess there are more standard organisations that we
currently need in order for us to be efficient.
Behind every protocol there is a political agenda. There are vested
interests where each side vendor or carrier wants to promote his/her own
interests.

/nikos



On 5 June 2012 02:52, Raghul Prasanna <raghul82 at yahoo.co.uk> wrote:

> Hello,
>
> I was looking at standards for SIP to ISUP and ISUP to SIP mapping and
> found the following
>
> * RFC 3398 (IETF)
> * RFC 3372 (SIP T) IETF
> * Q 1912.5 (which talks about SIP profile A, B and C (SIP I)) ITU.
>
> SIP I and SIP T defines the std for ISUP encapsulation and translation.
>
> The rest I believe says mainly about ISUP -> SIP and SIP -> ISUP mapping.
>
> RFC 3398 introduces the concept of SIP bridging two PSTN networks and says
> gateways bordering PSTN SIP network can encapsulate ISUP message etc.
>
> In ISUP to SIP network, we can encapsulate the ISUP message, but on a SIP
> to ISUP network we have to map the SIP messages (fields) to ISUP messages
> (fields). In order to do this which std will a gateway follow?
>
>
> Why do we have so many standards? Did some of them get superseded, which I
> believe can be because 3398 was formulated in 2002 while 1912.5 in 2004. Is
> that correct?
>
> If all are in use, who follows which standard or does it depend on vendor?
> Until now I believed Q1912.5 was the bible for SIP <-> ISUP mapping and
> gateways can apply either SIP I or do standard mapping depending on
> requirements, which I believe is not correct.
>
> To be honest I am lost a bit after going through the above standards.
>
> Can someone shed some light please?
>
> Thanks,
> Raghul
>
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-- 
Nikos Leontsinis
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