@RCPWisc 

 

I really don't understand what an OC200 has to do with your phone system, the OC200 is a device for managing switcher access points and routers, not phone systems. so in order for you to get help you have to explain briefly what you have in your network and how it is configured.

Do you have a router from TP-Link or is it a router from another supplier? is the router connected and has a public ip or is it behind another firewall

 

 

We have an ER8411 router, which the controller manages. We have an exclusively TP-LINK network, including several jetstream switches, access points, the ER8411 and the controller. The port forwarding takes places in the controller - that's where I've been going. I have all the requisite ports forwarded as per our phone system, and on one remote phone set, I'm not getting any audio. No other firewall ... just the ER8411, connected to the internet with a static IP.

  @RCPWisc 

 

Ok, then we have some more info to work with :-)
you have an old version on your controller, what firmware do you have on the ER8411? you may want to upgrade your system. I myself have an ER8411 and there have been quite a few changes to it with each upgrade.

  @RCPWisc 

 

I have not used IP telephony on TP-Link routers, but I have done it quite a bit on Cisco firewalls and there it has been either SIP ALG on or off, somewhat depending on the system, there has never been any problem on Cisco.

i don't really know if it will work same way on ER8411,

 

Thanks for the help, Mr. S. I know that on our system, SIP ALG must be off. I've verified that the box is not checked in the controller. We were using a Cisco series (RV325), and it worked fine. This ihas got me scratching my head - it shouldn't be this difficult. When I check for an update on the OC200 (v1), I get a "general error" response. Should I download the firmware and manually upgrade it? I'm not seeing that the router has a new firmware version available, but after checking on TP-LINK's web site, I see that v1.2.0 is the current version (I have v1.0). Is it because the controller firmware isn't new enough to detect that an update's available?

Thanks for the advice - I upgraded both the controller and router, and my issue has resolved itself. Appreciate all your help!