Add condition:

• working 3

• call 3

• call up 3

• contact 3

• dial 3

• get back to 3

• get on the horn 3

• get on the line 3

• give a call 3

• give a jingle 3

• give a ring 3

• make a call 3

• put a call through 3

• ring up 3

• get someone on the horn 3

• pick up 3

• buried 3

• online 3

• on the phone 3

• already taken 3

• assiduous 3

• at it 3

• diligent 3

• employed 3

• engaged 3

• engrossed 3

• having a full plate 3

• having enough on ones plate 3

• having fish to fry 3

• having many irons in the fire 3

• hustling 3

• in a meeting 3

• in conference 3

• in someone elses possession 3

• in the field 3

• in the laboratory 3

• industrious 3

• occupied 3

• on assignment 3