Dialing extension numbers not connecting to IPhone 8
Hi I keep trying to dial a extension number but it rings there side but I get no dialing tone. They cannot hear me there side but it definitely rings. I don’t get anything my side. Have tried adding the extension number to the original number but it doesn’t work at all.
Works fine on family members iPhones just not mine. Any ideas how to solve it. I’m in the UK. Thanks
iPhone 8 Plus