Cisco has announced the end-of-life of the ATA 190-SC product on October 13, 2020.

Answer a call on your ATA phone

Your analogue phone (ATA) works just like a Cisco IP phone.

When your analog phone rings, pick up the handset to answer the call.

Answer call waiting on your ATA phone

When you're on an active call, you know that a call is waiting when you hear a single beep.
1

Perform a hook flash to speak with another caller who is calling you.

You connect to the second caller and put the first caller on hold.
2

(Optional) To speak with the first caller, perform a hook flash again.

Subsequent hook flashes toggle you between the two callers. You can't create a conference this way.