Section 700 - Operation Chapter 3. System FeaturesICX-35-700 ICX (International), issued March/1998 29• N/AClass 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 4. Trunk COSHardware Requirements• N/AConsiderations• N/ANumber Feature1 Intercom Ringing Tone (trunk 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 DDI Dialled Number Conversion Table (DDI/CLI Table A or B)5 Paging on DISA/Tie-Line Call (Allow/Restrict)6 DISA Security Code Verification7 Network Flash Forwarding (Version 3.5 and higher)8 Network Flash Receive (Version 3.5 and higher)9 Brokers Hold for Network Calls (Version 3.5 and higher)10 Priority Message-Waiting Set/Cancel (Version 3.5 and higher)11 Network-to-Network Transfer (Version 3.5 and higher)12 Camp-On for Tie-Lines (Version 3.5 and higher)
