Jio WiFi Calling not working when phone is connected to BSNL Fiber.

  • Thread starter Thread starter Eustace
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Location
India
ISP
BSNL FTTH
Phone: Realme 7 Pro.

WiFi Provider: BSNL Fiber / BSNL FTTH.

ONT Model: Netlink V2802GW

WiFi Plan: 30Mbps / 399 rupees + GST.

SIMs in the phone: 2 Jio SIMs.

Problem: I'm using BSNL Fiber from last 2 years, but I cannot use WiFi Calling feature on any phone connected to this WiFi network. WiFi Calling is enabled from the phone's settings, but it just keeps showing "VoLTE" symbol on the status bar instead of "VoWiFi" symbol.
The funny thing is, in a month, WiFi Calling only enables itself for one random day, that too only for 10-15 minutes, then it goes back to VoLTE.
When I connect my phone to Jio Fiber, WIFi Calling symbol immediately comes on my status bar. Even when I connect my phone to mobile hotspot of another phone with Jio/Airtel/VI SIM, WiFi Calling immediately starts up. In my village, only FTTH available is by BSNL. Also, there is 1 bar indoor coverage by all 4 telecom companies, so WiFi Calling is an important feature for me. As I already told you, the WiFi Calling magically starts working on a random day of the month for 10-15 minutes (generally when electricity goes off & comes back few minutes later).

Another guy in the village uses BSNL FTTH but he has a Huawei router. When I connect to his WiFi, VoWiFi immediately starts working on my phone. So, how to solve this problem? Is there something wrong with the settings of my ONT?
 
Enable "IPsec ALG" in ONT settings. Note this is different from "SIP ALG" setting for VoIP calls which is recommended to be disabled by some websites.

ALG == Application Layer Gateway
 
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Bro @ka2107 , read this fully.

I went to Settings/Services/Firewall/ALG.

There 6 ALG types are given: ftp, h323, l2tp, ipsec, sip, pptp.

All these 6 ALG types were ALREADY ENABLED.

So, out of curiosity, I disabled "ipsec".

WiFi Calling immediately started working on all phones in my house.

Then, I rebooted the ONT and all the phones in my house, still WiFi Calling is working 100% fine on all of them. I also turned airplane mode on & off, still VoWiFi is working properly.

For the first time in 2.5 years, I'm using VoWiFi. Thanks for suggestion to mess with "IPsec".

So, should I keep IPsec disabled? Is it dangerous to keep IPsec disabled?
 
@Eustace Interesting. "IPsec ALG" is supposed to enable IPsec connection over IPv4 NAT. WiFi calling (VoWiFi) by most networks worldwide uses IPsec protocol.

When my relatives had BSNL Fiber using Netlink HG323RGW, I had to ENABLE "IPsec ALG" in the HG323RGW settings in order to get Jio and a foreign SIM WiFi calling to work.

However my relatives switched to Airtel Fiber back in Feb 2024 and also using it in Bridge Mode with OpenWrt router so this ALG setting is not involved (in Bridge Mode) anymore.

Info about Jio VoWiFi: VoWifi experience on Jio
 
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