One-way audio problem

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This forum is for those users who have already purchased a configuration file with the SIP settings needed to configure any SIP compatible device.

1. Please use this forum only as a means to share your configuration advice and guides for ATA devices and SIP clients that you are using with our service.
2. For any questions relating to device configuration, please use the other forum sections or post your question directly in the device topic that your question is meant for.
3. Please title your topics with only the name and model of your device so users can easily find the information they need.
4. Preferable format for posting here is compressing your screenshots of your successfully configured device into a .zip file, and post a brief description of the configuration.

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One-way audio problem

Postby patrickk2012 » 01/12/2017

I have an OBI202 and am trying to set up Freephoneline on it. I followed the setup guide in this forum but with about 50% of my phone calls, I cannot hear the other side, but they can hear me. Calls to the same phone number will sometimes be fine, and at other times, I will not be able to hear the other side.

I have a Rogers Hitron CGN3 modem/router combination (cannot disable SIP ALG), so I used server, which is supposed to overcome SIP ALG problems, but I continue to have intermittent one-way audio problems. Except for port forwarding which I understand is a security risk, I followed the troubleshooting section of the configuration guide on this forum but it is still not working.

Do I have to go out and buy a separate router now and put my Hitron modem in bridge mode, even though I am using Does anyone have any other ideas? Any help is greatly appreciated!
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Posts: 1
Joined: 01/12/2017
SIP Device Name: OBI202
ISP Name: Rogers Cable
Computer OS: Windows 10
Router: Rogers Hitron CGN3

Re: One-way audio problem

Postby Liptonbrisk » 02/23/2017

I don't recall seeing your post until today. I had the exact same Hitron garbage that you had at one point. I always use my own router; I never rely on anything an ISP gives me. However, I did test with just the CGN3 by itself, and it worked fine with the settings I used in the guide with, except that I couldn't adjust the UDP timeout settings that I wanted to adjust. Consequently, I would expect registration every once in awhile to potentially fail (possibly after a power outage). It's easy enough to reboot the CGN3, wait for it to be up and running, and then reboot the OBi202. Regardless, it is advisable to buy your own router for VoIP purposes. Newer Asus routers that are supported by Asuswrt-Merlin work well using Merlin firmware:

I would try factory resetting your ATA and reconfiguring it.

When the problem occurs I would recommend checking the registration status of FPL in the ATA by
a) dialing ***1
b) Entering the IP address you're told into a web browser
c) navigating to Status>>>System Status>>>SP(FPL) Service Status

If FPL isn't registered there, you're going to have problems.

2. 1. Are you able to dial **9 222-222-222 to reach the Echo Test Server? If not, your problem has nothing to do with FPL.

3. Are you using Google Voice? If not, I recommend not using to configure your ATA. If you're not using GV, reset your ATA to factory defaults, delete your ATA from (Remove the OBi From the OBiTALK Web Portal
(a Sign in to and select the device you are going to remove from the OBi Dashboard.
b. Select the "Delete Device" button located on the right side of the screen. You will be prompted to confirm. Click "OK".
c. After a few seconds, you will see a message stating, "The device was deleted successfully."), follow the PDF guide I linked earlier, and don't use at all.
d. Factory reset your ATA: ... tory-Reset

4. If you insist on using the Obitalk web portal ( to configure your ATA, keep in mind that you must continue using it to configure your ATA. Otherwise whatever settings you change will eventually be overwritten by what you previously entered at anyway. If you wish to disable this behaviour, dial ***1. Enter that IP address into a web browser. Navigate to System Management-->OBiTalk Provisioning-->select Disabled for the method. Save. Reboot ATA. Now won't overwrite whatever changes you make via the device's interface (via IP address).

Pick one method ( or the other (IP address of device) for changing device settings. But do not use both methods.

5. If you're going to use (which I do NOT recommend using if you're not using Google Voice), you need to use the expert menu.
Take a look at this picture for reference:

That grey cog wheel with the "E" is for the expert configuration menu.

It shows when logging in at, selecting "Edit Profile" on the left, then scrolling down
under "Advanced Options" and finally selecting "Enable OBi Expert Entry from Dashboard."

Again, do not use both and the IP address of the device for configuring your ATA. Choose one method or the other. If you're going to use the IP address of the device, ensure that Obitalk Provisioning is disabled in the ATA first (found in the ATA under System Management-->Auto Provisioning)

6. Follow the .pdf guide located at viewtopic.php?f=15&t=18805#p74310, but only use when you get to step 6c. on page 14. Pay close attention to the Keep Alive settings mentioned in the guide. Follow the guide step by step.
Please do not send me emails; I do not work for nor represent Freephoneline or Fongo. Post questions on the forums so that others may learn from responses or assist you. Thank you. If you have an issue with your account or have a billing issue, submit a ticket here: Visit to check FPL/Fongo service status. Freephoneline setup guides can be found at viewforum.php?f=15.
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