iOS v2.21.1 SDK Released Jessica Chapin February 16, 2022 11:29 Updated This article may be out of date! Please visit our new help center api.support.vonage.com Version 2.21.1 of our iOS SDK is available. This version adds the ability to enable Opus DTX. For more information, see the release notes in our developer documentation. Comments 0 comments Article is closed for comments.