Jonathan_Tree

Hi @tonygibbs16, Thanks for looking at this. They are on Lebara mobile and I've searched online and couldn't find any info on this. I've already logged into the router and changed the firewall settings to allow UDP ports 500, 4500 and TCP 143 ports, as well as reducing the MTU size and enabling SIP ALG. So confused on this…

Hi Liba, When you say device, do you mean the router or the customer's phone? I've gone through samsung settings with the customer and the Wi-Fi calling works fine when connected to other routers, so I know its not a handset issue and they can do outbound Wi-Fi calling, it is just inbound. I also have other customers using…