Possible Clues:

• Old long-distance communic­ation could be a trumpet
• Case for accountant finding two novices connecting with jumbo perhaps
• Contact with non-local telephone box name
• Communication of old by elephant?
• Distant dial for the trumpet
• Old communication from, perhaps, plane or jumbo?
• Trumpeter's bell?
• Trumpeted communication?
• Communication at a distance peculiar to India and Africa?
• Phoning from an elephantine distance (5, 4)