SIP TLS 1.2 Requirement for Cisco Webex
From April 25, 2019, the Webex app will require TLS 1.2 for your deployment to remain in compliance.
The Payment Card Industry (PCI) Security Standards Council recommends that organizations stop using Secure Socket Layer (SSL) and Transport Layer Security (TLS) 1.0, and upgrade to TLS 1.2 as soon as possible. See Migrating from SSL and Early TLS .
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