Hi I have recently installed a RUT360 with a Smarty SIM (UK). I am experiencing intermittent WiFi calling, where the the phones just stay silent with no sound or response on the called phone. It either starts to work after a few tries or switching WiFi off/on on the phones. Both phones worked well with the previous TP-Link router with land line. The phone are 1- Samsung Galaxy S22 and an iPhone 11. The internet connection is good with around 40mb download and 25mb upload. Band 3 4G (FDD LTE); VoLTE. Firmware version RUT36X_R_00.07.02.7.
I have checked the following:
"Enable Software flow offloading in Network -> Firewall -> General settings.
See if Allow-IPSec-ESP and Allow-ISAKMP rules are enabled in Network -> Firewall -> Traffic rules."
Can you suggest anything for me to try please?