So anyone can help me what I can configure and I should be able to make calls
You still haven't answered my question about where you got your Optus SIP registration/configuration information.
Here is my ASUS configuration. The fact that you are currently able to make and receive ANY calls form ANY provider should mean that you already have configured your ASUS in a similar way.
The "Local IP" will obviously be different, and point to your Linksys.
And because you have 2 VoIP lines you will need to use a "Port Range" of 5060-5061 instead of just 5060.
I got configuration information from Optus. On Line 1 (Optus) it is successfully register and Online. As you mention I opened 5060,5061 in Netfilter I disable SIP Passthrough. I opened 16384-16482 and subset of 10000-20000. I am able to receive call but not able to make call.
I got configuration information from Optus.
Congratulations!, not many people have be able to get Optus to give them their SIP credentials.
As you mention I opened 5060,5061 in Netfilter I disable SIP Passthrough. I opened 16384-16482 and subset of 10000-20000. I am able to receive call but not able to make call.
I've just had a look at the MyNetFone VoIP setting and from what I can see they use port 5060 and so do Optus. This is most likely the problem.
Optus is unlikely to help, so you might try and contact MyNetFone support, tell them that Optus uses port 5060 as well and see what they say.
Mynetfone is just for testing..... So I configured on Line 2 Mynetfone to check on Line 2 Mynetfone .
Ok then. You should leave the Mynetfone disabled (from within the Linksys settings) when you are testing the Optus line. Its unusual that both services are using 5060 and it just ads another unnecessary variable during testing. The inability to make outgoing calls is typically a registration failure, and registrations are done through port 5060. Incoming calls can trigger registration temporarily and there temporary dialtone availability.
As far as I can tell, your ASUS config is fine.
So we are back to dialplans. Have you tried using my exact dialplan?