My ASN.1 Notes
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Resources
Nice examples
Example explaining CHOICE tagging
Example to understand IMPLICIT tagging
TBCD
Telephony Binary-Coded Decimal strings are not part of the ASN.1 standard, but their use is prevalent in many telephony-related ASN.1 specifications.
Conversion of these types into standard numeric text strings is supported by Objective Systems software.
In general, BCD strings pack two numeric digits into a single byte value by using a four-bit nibble to hold each digit. By convention, the digits are reversed in TBCD strings, but there are no official standards for this encoding.