Speakerphone is a plug-in that allows sounds to be played through various speakers. Plus, you can add effects and environmental sounds to enhance the soundscape. Here’s a little text from their website.
All the walkie-talkies, distant transistor radios, upstairs TV sets, bullhorns, cell phones and guitar cabinets you’ll ever need. Speakerphone (Mac , Windows, iLok or challenge response) will add dial tones, operators and static, and you can select from a wealth of ambiences on either the caller or receiver’s end.
270 speaker impulse responses powered by Altiverb, 30 Altiverb rooms, 5 gigabyte of ambiences and sound FX, conveniently presented to you in 500 presets.
Check out the video. http://audioease.com/Pages/Speakerphone/speakerphone.html