| In-house |
| Not int. |
| Tel. line |
| Bus. line |
| Add-on no. |
| Addnl. ph. |
| Inside no. |
| PBX number |
| Sec. phone |
| Second ph. |
| Office no. |
| Add'l phone |
| Tel. add-on |
| Outer: Abbr. |
| Transfer no. |
| Business no. |
| Addnl. phone |
| Ell on a bldg. |
| Work phone no. |
| Bus. card info |
| Bus. line abbr. |
| Dept. phone no. |
| Directory abbr. |
| Phone no. abbr. |
| Tel. no. detail |
| Bus. phone line |
| Bus. card datum |
| Tel. no. add-on |
| No. after a no. |
| Bus. card abbr. |
| Add'l phone line |
| Addnl. phone no. |
| Office phone no. |
| Opposite of int. |
| Phone line abbr. |
| Second tel. line |
| Call routing no. |
| Phone no. add-on |
| Certain phone no. |
| Fire dept. device |
| Phone msg. detail |
| Switchboard abbr. |
| 3 after 10: Abbr. |
| Phone no. adjunct |
| Tel. no. addition |
| Business card no. |
| Call routing abbr. |
| Contact info spec. |
| Extra phone: Abbr. |
| Office contact no. |
| Office phone abbr. |
| Outside, for short |
| Antithesis of int. |
| Phone no. follower |
| Phone no. addition |
| Tel. number add-on |
| Annex or ell: Abbr. |
| Business no., maybe |
| Not interior: Abbr. |
| Office phone add-on |
| Part of a suite no. |
| Request to an oper. |
| Office number abbr. |
| Second phone: abbr. |
| Business card abbr. |
| Certain phone: Abbr. |
| No. after a tel. no. |
| Telephone no. add-on |
| Interoffice phone no. |
| Time-saving phone no. |
| Business-card letters |
| No. after a phone no. |
| Digits after a ph. no. |
| Part of some tel. nos. |
| Three-digit no., often |
| No. on a business card |
| Bus. card info, perhaps |
| Business phone no. part |
| Phone no. at the office |
| Abbr. after a phone no. |
| Part of a telephone no. |
| Office phone line: Abbr. |
| Something to dial: Abbr. |
| Three nos. in the office |
| Abbr. on a business card |
| No longer existing: Abbr. |
| No. after a telephone no. |
| Switchboard hookup: Abbr. |
| Business phone no. add-on |
| Letters on a business card |
| No. dialed in a phone menu |
| Receptionist's info: Abbr. |
| Abbr. after a phone number |
| No. after a 10 digit number |
| Part of an office phone no. |
| Abbr. after a telephone no. |
| No. for an interoffice phone |
| Outdoors, in a script: Abbr. |
| Phone no. dialed "at any time |
| Phone number addition (abbr.) |
| Switchboard connection: Abbr. |
| No. after a main telephone no. |
| No. in a business email footer |
| Request to a switchboard oper. |
| Abbr. after a telephone number |
| Addl. telephone off a main line |
| Nos. pressed after getting through |
| Screenplay abbr. for outdoor shots |
| It often precedes a three-digit number |
| No. after a no. in an e-mail signature |
| Digits after an office phone number: Abbr. |
| No. to enter when the company voicemail begins |
| Abbr. after a phone number, on a business card |
| No. that you can dial at any time during a voice menu |