asterisk users - Feb 2006 - AGI onAnswer function: does it exist?

Hello,

I am trying to write an AGI in Perl and I need to execute a function upon answer
of a call.

I know that there is the possibility to use the M() option in the Dial command
in order to do what I need, but that would mean that I would have to incorporate
the function's work in a different AGI program, and I need to avoid this.

So, I would like to know if such an option is available in AGI like an
onanswer() function or something equivalent that I can use.

Any help would be really appreciated, as I've been searching
www.voip-info.org and the Asterisk mailing lists for days now, without any
success.

Best regards,
Vlasis Hatzistavrou.