C20 to Polycom MGC-50 no video

[ricardo.cbezas]

We have non-IP setup with a Cisco quickset C20 running ISDN lines using a Cisco ISDN link, when calling the polycom bridge we receive audio but no video is sent or received. I can make a direct call to another polycom and have no issues but when calling  the bridge it seems that it connecting in secondary mode, or audio only. Any Ideas?                   

[ahmashar]

what type of ISDN gateway is it? have you look at the log files there?

when you said you make a direct call to Ply endpoint, did you mean direct IP call? not a Ply expert but doesn't MGC open up two connection lines/stream to each endpoint?

[ricardo.cbezas]

Is four bri lines connected to the Cisco ISDN telepresence link, by calling direct i mean direct dial to a polycom ISDN vtc without the need of the bridge. Not  ply expert either not sure how the MGC works. But if it does openn  two connections how do i configure the C20 to accept the connections. Currently i only get audio but no video.

Thanks for you help in advance.

[Dharmesh Nandoria]

Hi,

As per detail given in the post , Calls are working with other polycom unit and not with MGC - This confirms configuration for C20 is ok .

You can disable encryption and test if call works .

codec :

xConfiguration Conference 1 Encryption Mode: Off

Link :

xConfiguration H320 Encryption: Off

Another problem i can see related to ISDN lines , Is your unit and MGC using ISDN lines from same service provider ? If not then may be issue with service provider network interop .

hth

Kind regards,

Dharmmesh

[gasparaud]

Hello i am having the same issue with an SX80/isdn link connecting to a Polycom MGC100. After a few calls we realized that the call worked if we disabled H.264.