Hello sschnei,
welcome to the Polycom Community.
The community's Video FAQ contains this post here:
- Jun 21,2014 Question: Are there specific Ports in my firewall that I need to open in order to utilize video conferencing?
Answer: Please check the relevant release notes or admin guide for your device under the section “Inbound and Outbound Ports” or "Port usage" => here <=.
In addition check this FAQ post => here<= for more details and troubleshooting suggestions.
- Jun 21,2014 Question: What could be causing one way video or one way audio when utilizing video conferencing?
Answer: Please check the relevant release notes or admin guide for your device under the section “Inbound and Outbound Ports” or "Port usage" => here <= in order to open the relevant firewall ports.
In addition check this FAQ post => here<= for more details and troubleshooting suggestions.
The above can be utilized to check via Wireshark if the ports utilized (and documented in the Admin Guides) used for content are actually utilized or blocked by a firewall.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services