I have connected the Polycom VSX 7000A directlly into the ADSL Cisco Router and forwarded the ports to the IP Address of the Polycom Device as follows;
I can establish a call and I can receive a call, but the clarity of the picture is not that much good as well as the audio. I even made sure that the only Polycom Device is the one which is connected and using the Internet, but still same quality of Audio/Vidoe. I can see huge packets lost in the call session. Attached the call session.
I have configured QoS in the Cisco ADSL Router based on the Polycom MAC Address for 1920 Kbps and to have High Priority, still no joy.
Is there any settings / configuration to have a stable/clear Audio/Vidoe Conference in the Polycom Device or special settins in the ADSL Router I should take care of?
You may like to test to another end point. I know little of the interop with Codian.
1920k sounds a little agressive, try less. Aspecially with an ADSL Line where upload may be significantly poorer than download.
All the ports you listed are ok but anything after TCP1720 on your list is probably unnecessary. TCP1720, TCP range UDP range will be enough.
Try 220.127.116.11 Our Hosted BBC Freeview box on a VSX7000s V18.104.22.168.(Unattended 24/7)
In Admin>General>Home Screen Settings you can tick a box for Call Quality. This will enable a drop down under the dialing entry field to select what type & speed of call you wish to make. Also in Admin>Network>Call Preferences, you can set prefered minmums & maximums for ISDN & IP preferred call speeds. The last page of that sequence allows you to turn off (make invisible) certain call speeds.