I am wondering if anyone has come across such an issue on the same Router/gateway that i am running.
Since i switched to Starhub on this Router/gateway in mar 2019, the Wi-fi calling has not been working.
I have performed factory reset and power restart on the router/ONT several times.
I know for a fact that it is not an issue with the iphone (Iphone 7) as i have wifi calling working with the same phone in other Wifi networks in Singapore.
In addition, i have 2 x other iPhone at home that is having an issue.
Tried to do port forwarding to allow the VPN tunnel to establish but to no avail.
So it is either: Linksys router issue or Starhub Home ISP issue with establishing the VPN tunnel required for Wifi calling to work.
Mobile Phone is with Singtel but i have confirmed with Singtel rep that wifi calling is available for all Wifi based out in Singapore.
I'd suggest to check your IKEv2/IPSec settings to make sure that they are allowed through
Maybe you can try to reset your router settings in case something got enabled by mistake.
Linksys might be able help.
You can call them at 67016971
Thank you for the reply.
From the logs of the router, i can see that isakmp traffic is passing outbound to destination.
I suspect that somehow in Starhub internal network, it is dropping these isakmp traffic, hence it cannot complete the ipsec tunnel negotation with the destination in Singtel network.
I have the destination tunnel ip, would providing that allow Starhub to confirm if there is any block on their end?
Yesterday, starhub field engineer attended to me onsite and confirmed that it is not an issue with the router. Tried a different linksys router and same behavior.
We did confirm that if the celluar was starhub, then the wifi calling works.
Referencing to singtel's wifi calling terms and condition - they confirmed that all wifi based in Singapore should work. Which is why i suspect it is starhub network that is blocking these isakmp udp traffic for tunnel to be established.
I've been in contact with our engineer to come up with this response
Our engineer did the following test to show that StarHub did not block the ports/protocol:
If you do know the destination server IP for Singtel's VoWIFI, please let us know and we'll be more than happy to test it out. You may also want to provide your WAN IP to Singtel to confirm that there is no unintentional blocking on their end.