Re: Some very fundamental SIGTRAN question

Barry,

Good call!  

--brian

Barry Nagelberg wrote:                      (Fri, 13 Jan 2006 12:24:39)
> Stanislav,
> 
> 1) Your colleague is correct. xUA is a SIGnalling TRANsport (SIGTRAN)
> protocol, designed to transport legacy SS7 signalling over modern
> packet networks. Nothing more and nothing less.
> 
> Your definition has several errors:
> a) SGP/ASP/IPSP aren't protocols. They are network elements.
> b) Not "everything inside (ASP/IPSP/SGP) is implementor's choice".
> There are many "MUSTS" and "MUST NOTS" in the specs.
> 
> 2) Your colleague is wrong. No particular layers are mandated by the
> xUA spec. There are some RECOMMENDED layers, such as SCTP and Layer
> Manager, but the internal implementation is not MANDATED.
> 
> You are also wrong. The xUA protocols must be concerned with
> transmission of traffic. xUA, as an SCTP-user, must supervise and
> control the operation of the SCTP layer.
> 
> 3) You are both correct. At the SGP, the AS is essentially an
> addressing concept. At the ASP, the AS is essentially an application
> concept.
> 
> 4) You are both correct. At the SGP, the ASP is a transport concept
> (there is a 1:1 relationship between ASP and SCTP association). At the
> ASP, the concept of ASP is an instantiation of an AS.
> 
> 5) You are both correct. xUA handles transport. At the ASP, xUA
> handles granularity of Application Services - for example, how many
> instantiations, or ASPs, are necessary to handle the traffic for an
> Application Server.
> 
> 6) Your colleague is wrong. The interaction between Layer Manager and
> xUA is simply a recommendation. It's not a mandatory part of the spec.
> 
> Barry Nagelberg
> Adax, Inc.
> 

-- 
Brian F. G. Bidulock
[email protected]
http://www.openss7.org/