1) Visit
https://support.fongo.com/hc/en-us/arti ... ion-Failed, and go through the steps.
2) If you're using a modem/router combo, gateway, or hub issued by your ISP (and are NOT using your own additional separate router), contact your ISP to ask for assistance for disabling SIP ALG in the modem/router combo, gateway, or hub. Disable SIP ALG. Here are two examples for disabling SIP ALG in gateways issued by Rogers:
i) Hitron CGN3ACSMR and CODA-4582 series gateway modem/router combo from Rogers (and possibly other ISPs)
Open your web browser, and login at 192.168.0.1. Default username is cusadmin.
Select the “Basic” tab and disable “SIP ALG.” Click the “save changes” button.
ii) Arris XB6 from Rogers
Open your web browser, and login at 10.0.0.1
Navigate to Advanced-->Options.
Uncheck the SIP box.
Click "Apply".
Unfortunately, it’s impossible to disable SIP ALG at the time of this post in (Technicolor) XB7 Rogers gateways without enabling bridge mode and using your own router.
3) If you are also using your own separate router in addition to the one supplied by your ISP, then you should be enabling bridge mode instead in the modem/router combo, gateway, or hub issued by your ISP.
For Bell Hubs, visit
http://forums.redflagdeals.com/please-s ... r-1993629/. For Bell and Virgin Hubs, I find it's often simpler to perform PPPoE login in your own router (this is PPPoE Passthrough) and disable Wi-Fi in the hub. You will need the PPPoE Username and Password from Bell or Virgin.
For Rogers, visit
https://www.rogers.com/customer/support ... ridgemodem.
Shaw users will have to call Shaw to enable bridge mode at the time of this post.
For Telus Wi-Fi Hubs, put LAN port 1 on the Hub in bridge mode. Then connect your router to LAN port 1.
Alternatively, contact Telus and ask them how to enable bridge mode.
3 a) Afterwards, disable SIP ALG in your own separate router if you own one. Here is an example:
https://www.obitalk.com/info/faq/sip-alg/disable-alg.
In Asus routers, SIP ALG is called SIP Passthrough. Disable it. In Asuswrt-Merlin, the ALG is "+NAT Helper". Just make sure SIP Passthrough in Merlin does not show "+NAT Helper".
If none of the suggestions at
https://support.fongo.com/hc/en-us/arti ... ion-Failed help (make sure to try enabling "Fongo Alternate Connection"), submit a ticket:
https://support.fongo.com/hc/en-us/requests/new. Let them know the brand and model of the smartphone you're using and its firmware version.