And this is a very interesting info in NetSuite FAQ:

If you update your software and integrations regularly, your SuiteTalk (web services) integrations should not be affected by the end of support for early versions of TLS. Your integrations will be affected by this change if your company uses integration clients that are now considered outdated, and do not support TLS 1.2, for example, integrations built on JDK 1.6 or .Net 4.0.