What ports does Talk use

Hello forum,

I’m trying to get Nextcloud Talk (latest version on Nextcloud 18.0.4) to work outside our office. Within the office I can get video calls to work. But connecting outside our lan I get a black screen. I’m wondering if my firewall is blocking ports. What ports does Talk use for video conferencing calls outside our Lan

Thank you.

Just have a look at this Howto: