Edgerouter X Port 5060 open without UPnP?

Hi all,

I just noticed that Port 5060 is open on the outside of my network. Even though I didn't explicitly allow any port except OpenVPN (1194) and don't use UPnP. I have a VoIP device on my network so it would make sense for that port to be open but is it normal that it just opens up by itself?

Cheers