We use the Niles DBI on most of our projects with Connects and the Sonance 1250 amp that has an AUX input that ducks the music. This is a great solution for us. The DBI will also accept the trigger from a Nest Hello if you use the Nest door chime interface (included with Hello) or from the relay on a Doorbird.

For the OP, how about this: [Link: amazon.com]

or this with no ducking: [Link: amazon.com]