Does ISO 27001 require documentation of communication rules?

ISO 27001 emphasizes the importance of effective communication within an organization's Information Security Management System (ISMS). However, the standard does not mandate specific documentation of "communication rules." Instead, it focuses on the establishment of a framework for managing information security risks and effective communication relevant to those risks.

While it encourages organizations to establish communication channels and procedures, the specific need for documenting communication rules is not explicitly required. This allows organizations the flexibility to determine their own processes based on their context and specific needs, thus tailoring their approach to communication in alignment with their information security objectives.

Choices that suggest a requirement for documentation (either comprehensively or for specific types of communication) do not reflect the flexibility and discretion that ISO 27001 provides to organizations regarding how they manage and document their communication processes.