RT-AC68U WAN range to LAN range port forwarding

[n2vs]

I am trying to set up a VOIP phone system behind a RT-AC68U. each phone call needs to use UDP on 2 open ports. One port for audio in each direction.

So essentially we need to direct all WAN udp from a range of ports to the phone system on a LAN range of ports.

for example it could look like this:

WAN ports 10000-20000 --> LAN ports 10000-20000 -->192.168.1.(phonesystem)

I do this on routers all the time, but this one is only allowing:

WAN port range --> single LAN port --> IP address

so best i can get is a phone call with one way audio.

does anyone know a simple way around this with ASUS, or will I need to get a different router?

 

[RMerlin]

Put the range in the source port field (10000:20000 for example), and leave the destination port field empty. The router will automatically map the ports 1:1 when forwarding.

Alternatively, try not having any port forward, and enabling the SIP Passthrough option under WAN -> NAT Passthrough. This will enable the Netfilter SIP helper, which can potentially take care of handling NAT for you.