[no sarcastic tone implied]
Would the configuration be similar to a standard vpn tunnel for a site-to-site deployment? Does Asterisk handle anything differently than a standard vpn connection? I would imagine the data can come through vpn tunnel with no problem after you created routing policies and ACL for SIP connections on the hosted environment.
I am creating a standard site-to-site deployment for the first time, and all I needed was:
Peer External IP of firewall
Peer Internal IP/subnet range
My External IP address of firewall
My Internal IP/subnet range
I did use the ASDM on the ASA, so I cheated a bit.