After the person hangs up, the machine keeps the phone as "unhooked" and recording louder crackling until the "off the hook sound" beeps twice and then the machine finally disconnects

However, if you plan on using it as a screening device, the loud crackling is nerve wrecking.

The most annoying feature is the loud crackling on the messages

It's nice and compact/flat as

Two minor issues I noticed right away were (1) the voice playback on the 1740 is not as clear as on the 1739, and (2) the LED counter on the 1740 is not as large or bright as the 1739.

Works exactly as I assumed it would.

Now no more worries as to who is calling

Everything else worked just fine, but the recorded messages are so fuzzy with static as to be impossible to understand, whether listening on the external speaker or when calling in from a different line.

good as always

Works as it should.

Helpful and smal \l.