Internet phone not working

[DC1421]

I use an internet phone for hybrid working and the connection has been down for 6 days.  No calls in or out.  Broadband working ok and phone showing in service.   

Company phone tech suggests my internet provider have blocked ports and I should request them to unblock?
Changed to white router 2 months ago.  
Can someone assist?

[Lisa-P1987]

Hi there, I’ve escalated your post to our Community Messaging team who will invite you to a private chat shortly and help you with this. 

Just look out for the colourful bubble to start the conversation.

Here's more information on how Community Messaging works - https://helpforum.sky.com/t5/Did-you-know/Escalating-a-post-to-a-Sky-expert/ba-p/3711147