I can’t get that rule to work, but it works to have a port forwarding rule which directs the wan port to the lan IP, and then a forward rule to allow only the traffic from the source IP we want.
But this method does not seem to work for to open 5000-5082udp for SIP and 10000-20000udp for RTP for the pbx (minus the source IP needs to be open to all).
Another method I want to try is 1:1 NAT. I have two WAN connections one with 5 static IPs and one with 1 static IPs. I’m just not sure of all the in’s and out’s with having the two connections working at the same time.