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Cisco Bug: CSCvv92477 - Allow config of DH key length for H323 calls

Last Modified

Oct 22, 2020

Products (2)

  • Cisco TelePresence Video Communication Server Software
  • Cisco TelePresence Video Communication Server (VCS)

Known Affected Releases

X12.6 X12.6.1 X12.6.2 X12.6.3

Description (partial)

In VCS 12.6 software versions, allow administrators to define DH Encryption key length for H323 Calls:
Provide a command-line option to change that behaviour to allow a choice of key lengths: 1024-bit only; 2048-bit only; both 1024-bit and 2048-bit

VCS supports 2048 bit encryption for H.323 calls since 12.6 release. Will offer both 1024 bit and 2048 bit encryption for video endpoints. This is a hardcode change in VCS version 12.6.0~12.6.3.

While in previous VCS 12.5 release, VCS only support and offer 1024 bit encryption for H.323 endpoints.

However, this "offer both 1024 and 2048 bit encryption" change in VCS 12.6 code cause issues when setting up calls between VCS and Video Endpoints, one-way or no-way audio/video could be seen. 

This request is in VCS 12.6 CLI add a handle to make "H.323 Encryption Level" as a configurable value between 1024 bit and 2048 bit. So admin could choose the value to fit their environment.

ETA is 12.6.4 MR release.

VCS software version 12.6.0-12.6.3
Affeced endpoints use H.323
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