The answering machine would plug into the telephone jack on the wall, and the telephone would plug into the jack on the rear of the answering machine.
Now you do mention that the telephones are multi-line units. This could complicate things a bit because the 1739 is a single line answering machine.
If the telephone does not have individual jacks for each line (a jack for line 1 and another jack for line 2) you would need to purchase an adapter (maybe 2 of them...depending on the wall jack) that takes a 2 telephone lines and splits them into 2 individual jacks.
For example:
http://www.tti.net/computer-telephony/phone-accessories.html
After the lines have been broken out, you can connect the answering machine to the line that needs it. You would then either plug the lines into their respective jacks on the wall, or use a 2nd splitter to combine the 2 lines back at the wall jack.
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