Summer of code - what is the valid email address


Few days ago I read that Asterisk is one of “Participating Mentoring Organizations” in Google’s “Summer of Code”. Unfortunately there isn’t any email address where should I send proposal. I tried with webmaster@digium (the only address that I’ve found on website), but I’ve got reply that it isn’t right address and suggestion to try on one of these forums.
So, my question is, where can I send proposal (related with Asterisk) for Summer of Code?

Thanks for reply