22.2263GPPGlobal Text Telephony (GTT)Release 15Stage 1TS
The user shall be able to use and access GTT in a secure manner. Within the limitations enforced by the host environments, the following apply.
– It shall be possible for the contents of GTT sessions to be read only by the intended recipient(s).
– The “Security Threats and Requirements” specified in 22.133  shall not be compromised.