Hello, I have a query regarding the ASN.1 Version specified in H.323 Version 3 standard and T.38 standard.
H.225 version 3 and H.245 version 5 specifies the following ASN.1
Versions:
ITU-T Recommendation X.680 (1994): Information Technology - Abstract
Syntax Notation One (ASN.1) - Specification of basic notation. ITU-T Recommendation X.691 (1996): Information Technology - ASN.1
Encoding Rules - Specification of Packed Encoding Rules (PER).
ITU-T T.38 Recommendation specifies the following version of ASN.1 ------------------------------------------------------------------- ITU-T Recommendation X.680 (1997), Information technology - Abstract Syntax Notation One (ASN.1): Specification of basic notation.
ITU-T Recommendation X.691 (1997), Information technology - ASN.1 encoding rules - Specification of Packet Encoding Rules (PER). ------------------------------------------------------------------------ -----------
I would like to know which version of ASN.1 to be followed.
The current version is dated 2003. The right references for each part of the ASN.1 standard are listed at:
http://asn1.elibel.tm.fr/standards/
> Could some
one explain the differences in these versions.
http://www.itu.int/ITU-T/studygroups/com17/changing-ASN/index.html#2
You will also find information in sections 6.3.4 and 6.3.5 of my book that you can freely download from http://www.oss.com/asn1/dubuisson.html
> Would there be any
problems if ASN.1 X.680 (1994) and X.691 (1996) is used in T.38 Encoding/Decoding.
No, all versions are compatible as far as encoding rules are concerned. -- Olivier DUBUISSON france telecom R&D
DTL/TAL - 22307 Lannion Cedex - France t: +33 2 96 05 38 50 - f: +33 2 96 05 39 45 - http://asn1.elibel.tm.fr/
