Section 700 - Operation Chapter 7. SLT Features576-50-700 DBS 576HD (USA) issued September 2001 3-11Class of ServiceDescriptionA Class of Service (COS) allows or restricts access to a group of features or functions. For instance,an Extension COS may allow Call Forwarding features. In the System, both extensions and trunks useclasses of service.The System supports the following COSs for trunks and extensions:• COS - Trunk/Tie• COS - Ext/Ext Restriction• COS - Extension Feature• COS - Trunk to Trunk RestrictionClass of Service - Trunk/TieTie/Trunk COS allows or restricts access to various features. Each trunk is assigned to one of 16 trunkclasses of service (00-15).The following table shows the features that can be enabled/disabled for each trunk COS.Table 3-1. Trunk COSHardware Requirements• N/ARelated Programming• N/AConsiderations• N/ANumber Feature1 Intercom Ringing Tone (CO or intercom ring tone)2 Dial Tone to Tie Lines (Enable/Disable)3 Forced Recover on Fast-Busy Tone (Send fast busy or disconnect line)4 DID/DDI Dialed Number Conversion Table (DID/DNIS Table A or B)5 Paging on DISA/Tie-Line Call (Allow/Restrict)6 DISA Security Code Verification7 Network Flash Forwarding (Version 2.0 or higher)8 Network Flash Receive (Version 2.0 or higher)9 Brokers Hold for Network Calls (Version 2.0 or higher)10 Priority Message-Waiting Set/Cancel (Version 2.0 or higher)11 Network-to-Network Transfer (Version 2.0 or higher)12 Camp-On for Tie-Lines (Version 2.0 or higher)13 T1 Trunk Ring Back Service Tone (Version 3.5 or higher)
