Answering calls from a channel with CLI...How to do it?

Hello everybody. I have a problem and I came here to get help:

I have a softphone (x-lite) and it registers in asterisk. Of course when my softphone receives a call I can answer using it but is there any way to answer the call using the CLI (without touching the softphone)?
How can I do it?
I want to know if it is possible because I wanna answer a call using AMI (I am devoloping a C# program) . Then I can send a “Action: Command” to asterisk to make a CLI command and answer a call without using the sofphone.

If it is not possible to answer a call using AMi, Is there any way to answer the call using another action?

I am brazilian and sorry for any mistakes in the use of english.

Thanks for the replies.