asterisk-Softmodem
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Add parity
If using old (V23) terminals designed for use with the old UK Prestel system, they expect, and issue, data with 7 databits, even parity, 1 stop bit. This change adds parity support (both even and odd) to the analogue side. IP side remains 8-bit clean.
[ Sorry about all the white space removal in the diffs; my IDE did that automatically. ]