Section 700 - Operation Chapter 3. System Features576-25-700 DBS 576 (USA), issued March 1999 33Hardware Requirements• N/ARelated Programming• FF2: Trunk COS• FF3: Extension COS AssignmentsConsiderations• N/AClass of Service - Trunk to Trunk RestrictionTrunk to Trunk COS allows or restricts call transfers from one trunk to another trunk based on theoriginating and receiving trunk COS.Hardware Requirements• N/ARelated Programming• FF1-0-04: Class of Service Trunk/Tie• FF1-0-11: Trunk-Trunk RestrictionConsiderations• N/AClass of Service - Extension (Station) TimersCPC-96, CPC-288, and CPC-576 Version 2.0Prior to CPC Version 2.0, timers related to certain extension functions such as the Hold Recall Timerwere only available on a system-wide basis. Beginning with CPC Version 2.0 these extensionfunctions may continue to use the same system-wide timers or a newly added Station Timer Class47 Station Call Park Transfer (Allow/Deny)48 OHVA (Allow/Deny)49 OHVA Answer (Allow/Deny)50 Call-Waiting Answer at HOLD51 On-Hook Park52-54 Not Used55 Station Lockout (Own)56 Station Lockout (Other)57 Absence Message Set58 UNA Pickup59 Intercom Ring Tone at CO (Version 2.0 or higher)60 BGM AccessClass of Service Features