Classified Ad over Phone

Need a good system where people can browse ad and post ad via voice Phone i will create a custom category press 1 for Jobs press 2 for propieties press 3 for ............... then if i press 1 another OGM for post press 1 to listening other post press 2 people can leave a record messege to be contacted once you press the right description you will start listening all the recorder from other people after message as ben play you will listening to replay message press 1 to listening next message press 2 to go go back to previous categoty press * Once the system is runing we may have to make same changes so be open to make at least few modification upon request also the sytem must to handle at least 100 or more simultaneous call contact me with a good price and if you have working in something similar so i can tested Sorry for my english any question ask