Triple WAN

Do any of the ASG devices support more than two WAN connections? We currently have dual WAN set up on our ASG 220 and it works great. The reason I'd like a third WAN connection is because we're looking at setting up a VOIP system and the vendor recommends having a dedicated Internet connection for it. So we would have two WAN connections for our regular Internet usage like we do now and then a third WAN connection for our VOIP traffic.

Thanks!