33 CFR § 105.235 - Communications.

(a) The Facility Security Officer must have a means to effectively notify facility personnel of changes in security conditions at the facility.

(b) Communication systems and procedures must allow effective and continuous communications between the facility security personnel, vessels interfacing with the facility, the cognizant COTP, and national and local authorities with security responsibilities.

(c) At each active facility access point, provide a means of contacting police, security control, or an emergency operations center, by telephones, cellular phones, and/or portable radios, or other equivalent means.

(d) Facility communications systems must have a backup means for both internal and external communications.