Unlike regular PSTN/Landline calls to FPL, FPL to FPL calls are treated as SIP URI calls. The same holds true for Fongo to FPL calls.
Ensure X_AcceptSipFromRegistrarOnly is disabled in the OBi200. The setting is found under Voice Services-->SP(FPL) Service.
In the OBi110, for testing purposes, remove everything from X_AccessList (if it's being used), which is found under Service Providers>ITSP Profile (service you're using) >SIP>X_AccessList
Did the problem only occur after porting? Or did you not test calling each other before porting?
SIP ALG is SIP Passthrough in Asus firmware and in Merlin. I use Merlin with SIP Passthrough set to "Enabled + NAT Helper". Freephoneline to Freephoneline calls work perfectly fine for me (receiving and outgoing).
In fact, I've set family members up with OBi202 and RT-AC68U running Merlin, and they call me all the time. Whenever I setup friends with Merlin, I never change the SIP Passthrough setting, and they've never had problems.
It's important, however, that whatever modem/router combo or gateway ISPs may have issued to customers are truly in bridge mode. Contact the ISP if need be to ensure the device they gave you is in bridge mode, provided it's not just a modem. If your sister is using DSL, instead of enabling bridge mode in the modem/router combo, it might be simpler to just perform PPPoE login using her OBi200, which would accomplish the same thing as bypassing the ISP's router. If she's using PPPoE, she would require her ISP's PPPoEUsername and PPPoEPassword. In the ATA, the settings are found under System Management–>WAN Settings-->Addressing Type (change to PPPoE). It would be best to ask the ISP first if they allow more than one PPPoE login (that works fine with Bell Hubs).
[Aug 27, 2020 5:29:53 PM Aug 27, 2020 5:29:57 PM Normal call clearing Montreal $ 0.00
The call is being received by FPL, at least.
a) Login at
https://www.freephoneline.ca/showSipSettingsb) ensure SIP Status shows connected
c) ensure SIP User Agent is something you recognize (if not, you've been hacked)
Note that only one registration per FPL account is allowed at any time. When there are multiple devices/softphones using the same account, only the most recent registration is valid. The previous device will lose registration, and, consequently, incoming calls will not work on it. This is especially important to consider if someone else is using your SIP credentials (username and password) that are found after logging in at
https://www.freephoneline.ca/showSipSettings or if you're trying to register your FPL account with a smartphone SIP app or with another device. Registration is required for incoming calls. It is not required for outgoing calls. A more significant concern, though, is that multiple registration attempts can lead to temporary IP bans. The more devices being used can make the temporary ban happen more quickly. Note that each time you reboot or restart your ATA or SIP app, it's attempting to register with Freephoneline again. Multiple registration attempts within a short period can result in temporary IP ban. Each time you reboot your ATA it's attempting to register with FPL's proxy server.
d) Login at
https://www.freephoneline.ca/followMeSettingse) For the purposes of troubleshooting, disable Follow me. Click "submit"
1) Do you experience the same issue calling from the Fongo Mobile app while your smartphone is connected to your LAN's Wi-Fi? Test by calling your FPL number from your Fongo Mobile app.
2) Does your sister experience the same issue calling from the Fongo Mobile app while connected to her LAN's Wi-Fi? Have her test calling from her Fongo Mobile on her smartphone to her FPL number.
a) Ensure X_AcceptSipFromRegistrarOnly is disabled in the OBi200. The setting is found under Voice Services-->SP(FPL) Service.
b) In the OBi110, for testing purposes, remove everything from X_AccessList (if it's being used), which is found under Service Providers>ITSP Profile (service you're using) >SIP>X_AccessList
3) This is the guide that should be used fully for your sister: download/file.php?id=2065.4) Both your sister and you (provided the settings exist in your ATA) should follow the steps from pages 42 to 44, under the heading,
"Are you getting one way audio issues with an OBi200/202 and Freephoneline? Are incoming calls not ringing? Can you not hear one side of the conversation (you can hear the caller, but the caller can't hear you or vice versa)?" OBi110 doesn't have X_DiscoverPublicAddress and X_DetectALG (I think), but OBi200 does. And no one can test to voip3.freephoneline.ca anymore; you won't be able to connect. Otherwise, the instructions are similar. During the steps, when prompted to disable SIP ALG, you can try disabling SIP Passthrough to see if that makes a difference for you. However, if simply rebooting the router followed by rebooting the ATA works, then the issue was unrelated to SIP Passthrough.