Expand VoIP subnet over VPN

Hello,

I have a new remote location that I will be setting up and plan to use our existing Mitel 3300 phone switch at the new location.

Question is, instead of using teleworkers, I am wondering if there is a way on Cisco asa5516 firewalls, or the layer 3 switch, to expand the VoIP subnet that the mitel is on to the new location.

I have done this with mikrotik routers via IP tunnel, but I do not use mikrotik anymore, and want to avoid this.

Thanks!