Related Clues:

• Bus. card abbr.
• Phone no. add-on
• Addnl. ph.
• Addnl. phone
• Phone no. addition
• Bus. card info
• Tel. no. add-on
• Ofc. line
• Add'l phone line
• Tel. no. detail
• Office ph. line
• Abbr. after a phone number
• Business-card letters
• Bus. phone line
• Request to a switchboard oper.