VoIP deployment using ASG

Hi,

I'm a newbie to Astaro devices and my company want to deploy it. All of this is a new setup, hope our expert can help me. I can setup the Site-to-Site IPSec base on the manual/guide but I don't know if IP Phone can directly connected to ASG 425 as well as on the RED, all IP Phone will be register to Asterisk on the main office. I attached the topology for more details.

Thanks,
Nher

Attached Images

topology.jpg (11.8 KB)