Issue with openVPN port forward in ASUS ac88u

[deeph203]

Hi. I am trying to setup a VPN server in my ASUS ac88U.
I managed to run the VPN, connect from outiside fine.
I have this issue thought. My mobile softphones cannot connect to our VOIP call center with openVPN.
SIP account is registered fine but the recipient of the call cannot hear us and we cannot hear him also. Phone is ringing

What I tried to ASUS is this:

1. I forwarded 1194 port to 10.10.10.1 (vpn ip address)
2. I forwarded sip 5060,5061 both tcp and udp to VOIP local ip address
3. I forwarded rtp ports 10000:20000 again to VOIP local ip address
4. Setup NoIP dns for the vnp to connect with host(working fine)
5. Asus firewall is off

But I cannot fix that issue. The strange is that the issue happens only with softphones applications running in computers or mobile phones. And only through VPN. When I am in local network everything works fine.

Another strange is that voip telephone machines( like grandstream) which have vpn client, they connect in same vpn, with same configuration in asus and they work fine.

What am I am missing here guys? Any help please?

 

[Tech9]

5. Asus firewall is off

Someone else will fix you over Internet shortly. Who gave you an advice to disable the Firewall???

 

[deeph203]

Someone else will fix you over Internet shortly. Who gave you an advice to disable the Firewall???

I did that for testing only...Forgot to mention