Here's a tip, You can access Alexa over SIP..
I'm testing it right now, (not using another trunk, but a separate line on my Cisco phone). It's a little slow, and has a timeout, so for instance if you have a long flash briefing it can't play the entire thing, but for short things like the switchboard, it's ok. Although, sometimes when I say "open switchboard", it thinks I am saying "open xbox". Nice proof of concept anyway, when it cooperates.
EDIT: LOL weird, it says my name is "the".