Bus. phone components, 4 letters
Business numbers: Abbr., 4 letters
Company lines?: Abbr., 4 letters
Many business phone nos., 4 letters
Nos. that will get you out of a phone tree, 4 letters
Part of many tel. numbers, 4 letters
Parts of office tel. nos., 4 letters
Parts of some tel. nos., 4 letters
Parts of some telephone nos., 4 letters
Personal organizer nos., 4 letters
Some business card nos., 4 letters
They're the end of some telephone nos., 4 letters