2.5.5.3 Trunk AccessDescriptionThe following methods can be used to access a trunk:Method Description Accessing methodIdle Line Access (LocalAccess)Selects an idle trunkautomatically from the assignedtrunk groups.Dial the Idle Line Access number, orpress a L-CO button.Trunk Group Access Selects an idle trunk from thecorresponding trunk group.Dial the Trunk Group Access numberand a trunk group number, or press aG-CO button.S-CO Line Access Selects the desired trunk directly. Dial the S-CO Line Access numberand the trunk number, or press theS-CO button.Conditions• COS programming determines the trunk groups available for making calls.• Trunk numbers can be referred on a trunk port basis.• Button AssignmentA flexible button can be customised as a G-CO, L-CO, or S-CO button as follows:Type ParameterLoop-CO (L-CO) No parameter (all assigned trunk groups through system programmingare applied.)Group-CO (G-CO) A specified trunk group.Single-CO (S-CO) A specified trunk.It is possible to assign:– the same trunk to the S-CO button and to a G-CO button.– the same trunk group to more than one G-CO button.– more than one L-CO button.Dialling the Trunk Access number selects a CO button in the following order: S-CO ® G-CO ® L-CO• Direct Trunk Access– Pressing an idle CO button automatically switches on the hands-free operation mode and allows a userto use On-hook Dialling. The user need not press the SP-PHONE button, MONITOR button, or lift thehandset.– When a user of a UT-series SIP extension uses an S-CO button to seize a trunk and then initiates acall, the outgoing call may be disrupted by an incoming call. In this case, the user hears a reorder tone.• Group Hunting Order for Idle Line AccessAn idle trunk is selected from the trunk groups assigned for Idle Line Access. If multiple trunk groups areavailable, the trunk group hunting sequence can be determined through system programming.• Trunk Hunting Order for Idle Line Access and Trunk Group AccessThe trunk hunting sequence in a trunk group (from lowest numbered trunk, from highest numbered trunkor rotation) can be determined through system programming.Feature Guide 1092.5.5 Seizing a Line Features
