Static severe Audio connection endpoint Polycom HDX series

Greetings,

I'm looking for ideas on the question.

We experience severe (and immedate, connecting) levels of static audio when Cisco (SX20 or C40) endpoint connects to a Polycom HDX endpoint.  Cisco endpoints are running TC7.2.1.  This doesn't happen when you connect between Cisco endpoint to an endpoint of Polycom VSX.

If HDX endpoint connects to a Cisco endpoint, in addition, there is no problem.  This only happens during a call from Cisco to HDX endpoint.  All connections are made via H.323 SIP not.

All units are stored on the same device of control VCS.  VCS rolls X8.5.1 and shows no errors or questions.

Any thoughts would be appreciated.

Thank you

-TM

This is a bug in TC7.2.1

See here

CSCuq94402

CSCur78783

Symptom
Get a white noise for audio and not video

Condition
Use TC7.2.1 and Polycom with software version 3.0.5 and call using H323 with active encryption.

Workaround
Disable encryption, call using SIP, downgrade from TC7.1 or earlier version of Polycom or wait for TC7.3.0 and xConfiguration H323 1 encryption KeySize value profile: Max1024bit

We have disabled encryption until TC7.3.3 is released.

7.2.1 is originally models C20 revive the call

7.1.4 has vulnerability shellshock

Tags: Cisco Support

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