11.6.5. Left-Justified/Right-Justified A-Number Display 
The standard display mode is right-justified. This means that if the
calling party's number (A-block number) is longer than the number
of digits specified in the MABLK parameter, the beginning of the number
will run off the left side of the display block. If the A-block number
is shorter than the number of digits specified in the MABLK parameter,
the left side of the display block will be filled in with zeroes.
If the display mode is set to left-justified, the end of the calling
party's number will run off the right side of the display block,
if too long. If shorter, the right side of the display block will be
filled in with zeroes. You can change the display mode as follows:
- Set left-justified display mode
CHA-ZAND:TYPE=CCM,ADISPEND;
Default Value: ADISPEND i s n o t set (right-justified display mode)The total length of A-block + B-block + C-block, including separators and end-of-block characters, must not exceed 22 characters, otherwise the A-block will be truncated.