Hi Dean,
I understand that both X.680 and X.691 are to be used . But my
question was that
Which version of ASN.1 to be used, as the version information specified
is different in
both H.225 standard and T.38 Standard.
Thanks
Krishna
-----Original Message-----
From: Dean Anderson [mailto:[EMAIL PROTECTED]
Sent: Sunday, October 05, 2003 4:05 AM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED];
[EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: [T38] Re: [OpenH323]ASN.1 Version in T.38
You must follow both. X.680 specifies the notation. X.691 specifies
PER, which is a type of encoding. Think of it as the high level
language, and the object code.
--Dean
On Sat, 4 Oct 2003, Bujji Krishna R B wrote:
>
> 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. Could some
> one explain the differences in these versions. Would there be any
> problems if ASN.1 X.680 (1994) and X.691 (1996) is used in T.38
> Encoding/Decoding.
>
> Also, T38Modem README specifies the following
> "Cisco Users: You additionally need to use --old-asn and
> --h245tunneldisable options." Are these options used to overcome the
> ASN.1 Version Differences.
>
>
> Thanks
> Krishna
>
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