Re: SUA: Data limitation based on SS7 SCCP specification.

"Brian F. G. Bidulock" <[email protected]> Tue, 23 Oct 2007 15:03:05 -0600
Newsgroups	gmane.ietf.sigtran
Organization	http://www.openss7.org/
Message-ID	<[email protected]>
Sulakshan,

Well, that's why I put this in: RFC 3868, Page 115:

4.7.  SCCP - SUA Interworking at the SG

4.7.1.  Segmenting / Reassembly

   When it is expected that signalling messages will not fit into a PDU
   of the most restrictive transport technology used (e.g., 272-SIF of
   MTP3), then segmenting/reassembly could be performed at the SG, ASP
   or IPSP.  If the SG, ASP or IPSP is incapable of performing a
   necessary segmentation/reassembly, it can inform the peer of the
   failure using the appropriate error in a CLDR or RESRE/COERR message.

--brian


Sulakshan Vajipayajula wrote:                  (Tue, 23 Oct 2007 10:58:15)
> Hi all,
> 
> I have a question pertaining to limiting the data size in SUA connection
> oriented messages such as CORE or RELRE. 
> 
> The RFC says the following.  My question is, if the implementation
> should follow SS7 SCCP specification in limiting the data size or should
> it allow the data size based on the section 3.10.11.  The SCCP spec
> limits the data to 128 octets. Does this apply to SUA as well?
> 
> RFC 3868                          SUA                       October 2004
> 
> 
> 3.10.11.  Data
> 
>     0                   1                   2                   3
>     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>    |          Tag = 0x010b         |            Length             |
>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>    /                             Data                              /
>    \                                                               \
>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> 
>    The Data parameter field contains the SS7 SCCP-User application
>    Message, for example an INAP/TCAP message.
> 
> 
> 
> SCCP Specification:
> -------------------
> Parameter Reference Type (F V O) Length (octets)
> --------------------------------------------------
> Data  |     3.16   |      O   |        3-130
> 
> 
> Thank you
> Sulakshan
> 
> 
> 
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-- 
Brian F. G. Bidulock
[email protected]
http://www.openss7.org/