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
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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).
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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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