I found that there is Asterisk.NET and Monotone for .net developers like Adhearsion for ruby developers. I could not able to find the official web site of Monotone. Anyone is using Monotone or Asterisk.NET? If so, kindly share the feed back about Monotone and Asterisk.NET and the official web site of Monotone.
Never heard of monotone in this context and Google concurs. Are you sure you are not thinking of the open source implementation of CLR, Mono?
The Adhearsion web site seems to be down at the moment.
Generally, very few people use .NET with Asterisk. The main market is for people under political constraints. If you want a language for which you are likely to get support, use PHP,