Thanks Steffen. I chose to reply here as this is a more accurate representation of our problem. I hope that is ok.
We do have RealPresence Group 500 in our office that works fine with other VC from our other office. However, we are trying to connect to them using the Mobile app and have been struggling to get it working. Mobile app works only if it connected on the same LAN as Polycom VC. However, if we connect from our other VLANs or from WAN, we face the problem where the VC is able to see and hear the mobile app user but mobile app user cannot see or hear the VC user. We have used port redirection for the ports as suggested by Polycom.
I hope these details are useful.
For reference, your message:
Not knowing if you actually use any other Poly infrastructure or simply use the free version of RPM it is hard to comment. Do you have a Poly SR as you mention to struggle and help you?
![Screenshot_20191010-111159_Video[1].jpg 314 KB](/polycom/attachments/polycom/RealPresence_Mobile/1502/1/Screenshot_20191010-111159_Video%5B1%5D.jpg){kind=link}