Help unknown icon in status bar when connected via wifi (galaxy s5 - lollipop)

[Android Question]

Hi all. First time here as I need help with a query I have.

When connecting via wifi over the last week I've noticed a new unknown icon in my task bar. It of a home phone handset pointing up with a wifi icon above it. It looks like I'm making a call but I simply am not.

Any help would be appreciated

Many thanks in advance

 

[mikedt]

Phone calls over WiFi are available, it's a feature some phones have.

 

[El Presidente]

I've seen this question asked before and if it's the same icon I think it is, it means WiFi Calling is available.