MCU4500 series and Polycom HDX broadband bandwidth interop

Hello!

A customer brought it to my attention and I was not able to determine a good reason for it yet.  First of all, here are the settings;

-MCU4515 4.4 (3.49) running

-Polycom HDX (a 7000 and a 8000) running 3.03

-MCU and endpoints registered to a Porter, no bandwidth restrictions (they say)

-calls to 1.2 M

-MCU call termination points, H323

When connecting endpoints HDX, the incoming bandwidth for the MCU is half of the outgoing bandwidth to the HDX.  I can't find any setting in the MCU which has an effect any on this.  By default the settings of bandwidth on the MCU (inbound and outbound) are set more than the real call rate.

I tried to test with a 4.4 (3.49) running of the MCU4510 and two Cisco endpoints (EX90 C90), endpoint and saved for a VCS and the MCU points not saved.  The incoming and outgoing call, rate stays.

Y at - it no unpublished data of interop MCU which has a reference to this issue?  The customer said that wasn't a problem when the MCU was at 4.2 (1.50).

Thank you!

Thanks Bob.  The reason why this is happening now is that MCU had some previous issues by honoring the bitrates etc..  This problem has been fixed in MCU 4.4 under CSCuh81255.

When HDX calls, it always opens LC for ExtendedVideoCapability at the beginning of every call.  This leaves MCU to split the BW cut in two for hand and when the system wants to send the contents of the content.  Given that the already contained open HDX channel to MCU, MCU must reserve the quantity of bioweapons for content when the HDX decides to send and do not exceed 1.25 meg in your case.

I hope that makes sense to you...

Let me know if it doesn't.

VR

P2

Tags: Cisco Support

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