8.11.2.2.3. Mailbox per Line 
- The mail box buttons shall be line related (per line an assigned mail box).
- All users who own such a mail box button for a certain line can read, delete and distribute the entries of the mail box.
- Only 1 user can scroll through the same mail box at the same time.
- Per station up to 29 Mail box keys can be configured.
Remark:
- For the phantom lines the Voice/phone-mail features are not reached by call forwarding, because the call forwarding belongs to the terminal and not the line.
- No network wide function
Changing key layout (extend STD 126 and 127)
CHANGE-TAPRO:STD=126,DIGTYP=OPTIT19,KY06=MB; CHANGE-TAPRO:STNO=7210&7211,STD=126; CHANGE-TAPRO:STD=127,DIGTYP=OPTIT19,KY06=MB, KY10=MBLINE,KY15=MBLINE; CHANGE-TAPRO:STNO=7212,STD=127;
Add mailbox for line
ADD-ZIELN:STNO=7212,TYPE=MBLINE,KYNO=10,STNOMB=7210; ADD-ZIELN:STNO=7212,TYPE=MBLINE,KYNO=15,STNOMB=7211;
Key layout after generating this step
