Section 700 - Operation Chapter 6. SLT FeaturesDBS-2.3/9.2-700 DBS Manual - Revised April 2000 6-29Related Programming• FF1 (System) Extension Class of Service Setting (CPC-AII and CPC-BVersion 3.1 or higher)• FF3 (Extension) Extension Class of Service Assignment (CPC-AII andCPC-B Version 3.1 or higher)Considerations• With CPC-A, SLTs cannot receive callback requests.• Up to four Message Waiting/Callback Requests can be sent to any oneextension.• If a Callback Request is sent to an extension for which Call Forwarding isset, the Callback Request is automatically forwarded to the designatedextension. The Message Waiting/Callback request is not cleared if aconnect is extablished with the extension forwarded to.• You can send a Callback Request to an extension that has Do Not Disturbor Absence Message activated.• Beginning with CPC-A 3.28, CPC-B 4.07, and CPC-A II 6.0, making ablind transfer to an extension to which you have previously sent a callbackrequest will not cancel your callback request. Earlier CPC versionscancelled your callback request if you transferred a call to the sameextension.Off-Hook Voice Announce (OHVA)(CPC-A Version 3.1; All Versions of CPC-A II and CPC-B)DescriptionUse the Off-Hook Voice Announce (OHVA) feature to interrupt a busyextension and then make an announcement that only the called party can hear.OperationTo make an OHVA:1. Lift the handset.