Answer:

EXT

Answer	Crossword Clue
EXT	Outer: Abbr
EXT	Phone no. add-on
EXT	Internal phone no.

EXT	Outside (abbr.)
EXT	Addnl. phone
EXT	Tel. no. add-on
EXT	Tel. no. adjunct
EXT	Addnl. ph.
EXT	No. after a 10 digit number
EXT	Phone no. dialed "at any time"
EXT	Dept. phone number

EXT	Phone msg. detail
EXT	Phone menu no.
EXT	Phone no.
EXT	Request to a switchboard oper.
EXT	Business card abbr.
EXT	Office no.
EXT	Bus. card datum
EXT	Telephone no. add-on

EXT	Call routing no.
EXT	No. after a phone no.
EXT	Request to an oper.
EXT	Phone no. addition
EXT	Abbr. on a business card
EXT	Bus. line
EXT	Dept. phone no.
EXT	Office contact no.

EXT	Time-saving phone no.
EXT	Opposite of int.
EXT	Outer (abbr.)
EXT	Add'l phone
EXT	Added telephone line (abbr.)
EXT	Phone no. follower
EXT	Bus. phone number addendum
EXT	Part of a business phone no.

EXT	Telephone no.
EXT	Bus. phone no., perhaps
EXT	No. after a no.
EXT	Business phone no. add-on
EXT	No. after a telephone no.