The first implementation of push-to-talk in a messenger - completely without walkie-talkie - Teamwire
New York, USA - 26 October 2020: Voxer Walkie Talkie Messenger Mobile App Icon Logo On Phone Screen Close-up, Illustrative Editorial. Stock Photo, Picture And Royalty Free Image. Image 158011584.
Amazon.com: Text Messenger iChat Walkie Talkie : Toys & Games