RECOMMENDATION ITU-R M.584-2 … CODES AND FORMATS FOR RADIO PAGING
ANNEX I … Radio-paging code No. 1
1 Code and format
    1.1 Preamble
    1.2 Batch structure
    1.3 Types of codewords
    1.4 Codeword Generation (31: 21 BCH  Parity)
2 Message formats
    2.1 Numeric-only  message format
    2.2 Alpha-numeric or general data format
    2.3 Loss of synchronization
    2.4 Decimal representation of pager identities
    2.5 Message reception, display and alerting
ANNEX 2 … FLEX-TD
1 Code and Format
    1.1 Basic structure
    1.2 Sync Structure
    1.3 Block Structure
    1.4 Code Word Definitions
    1.5 Numeric Character Set
    1.6 Alphanumeric / Symbolic Character Sets
    1.7 Pager synchronization acquisition rule
    1.8 Time Diversity (TD)
    1.9 Traffic management/Transmission of long messages
    1.10 Multi-area/Roaming