What should all interphone messages be terminated with?

All interphone messages should be terminated with your operating initials to ensure clear accountability and traceability of communications. Including your initials at the end of a message signifies that you are the originator of the information being conveyed, which not only enhances the clarity of communication but also provides a reference point in case the message needs to be followed up later. This practice is essential for maintaining a professional standard in communication protocols, especially in dynamic environments where multiple personnel are involved.

It's important to ensure that messages are documented correctly, as verification of who sent the message can be crucial in situations where operational decisions or actions are based on the content of those interphone communications. Other options, while relevant in a broader communication context, do not provide the same level of assurance regarding the sender's identity that initials do.