FW: MEGACO errata

Chip Sharp chsharp at CISCO.COM
Fri May 26 17:22:14 EDT 2000


I looked back through my files.

It was set to 5 octets in TD33 that was submitted to SG16 in Geneva.

I've got a marked up version of TD-33a created 5 pm on 2/13 that still has
5 octets in it.  TD-102 that was produced on 2/15/00 had it changed to 2
octets.

I could not find any contributions, delayed contributions or TDs that
suggested changing this value, so I can only assume it was added during the
discussions between 2/13 (Sun) and 2/15 (Tues).

At 03:08 PM 5/26/00 -0500, Tom-PT Taylor wrote:

>I'm forwarding this to the SG 16 list copy the Megaco list because I think
>the MTP address was firmed up at Red Bank.  Can anyone account for the
>failure to accommodate longer MTP addresses?  Was it simply because the
>intention was to use Annex I transport within an ITU environment only?
>-----Original Message-----  From:   dacollins at notes.primeco.com
>[SMTP:dacollins at notes.primeco.com]  Sent:   Friday, May 26, 2000 1:03
>PM  To:     Taylor, Tom-PT [NORSE:B901:EXCH]  Subject:        MEGACO errata
>
>
>
>Hi Tom,  Having had a look at the latest version of the MEGACO spec, I
>noticed something  odd. The mId may be an MTP address. However, the MTP
>address is defined in both  the ABNF and ASN.1 specifications as being 2
>octets in length. The ASN.1  description provides a comment that the point
>code (PC) is 14 bits and the  network indicator (NI) is two bits.  This is
>only correct for the ITU version of SS7.  In several countries, different
>versions of SS7 are used and different  addressing schemes are used. In
>many countries, including the US, Canada and  China, the PC is 24 bits
>long, with the NI still at two bits, for a total of 26  bits. Therefore,
>to use an MTP address for the mId in those countries, the  definition of
>the mId needs to change.
>
>I hope this helps in finalizing the spec.
>
>Daniel Collins


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Chip Sharp                 CTO Consulting Engineering
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