Version 3 Enhancements

Default Numbering Plan Changes

Some areas of the default numbering plan have changed in Version 3. Extension numbers begin at 301, not 300. Additionally, Ring Groups (now part of the new Department Group feature) begin at 601, not 600.

VoIP Extensions

VoIP extensions are now available. You can install IP extensions on-premise in a managed network or remotely in off-site and home offices. There are two types of DSX IP extensions available: the 34-Button Backlit Display IP Telephone with Full-Duplex Speakerphone and the 34-Button Backlit Super Display IP Telephone with Full-Duplex Speakerphone. These keysets are quick to set up and support common CODECs so you can easily balance voice quality with available bandwidth. In an installation without a PoE compliant router, each DSX IP Keyset uses a single, low-profile ethernet cable to the desktop connected to a compact, unobtrusive DSX IP Adaptor.

Additionally, DSX VoIP supports third party SIP extensions that meet the SIP VoIP RFC 3261 standard.

For a complete index of the available VoIP resources, click VoIP Extensions in the menu bar at the top of this page.

Line Scheduling with Skip Ahead

The Line Scheduling enhancement lets you quickly set up how you want the system to handle incoming calls. Line Scheduling is easy to understand and intuitive to set up, but has the power and flexibility to satisfy even complex call answering scenarios.

Skip Ahead, part of the new Line Scheduling feature, allows a user to press a key to skip ahead to the next schedule entry. This Skip Ahead key and allows the user to advance from the current schedule to the next schedule. Have to leave early for the day? Just press Skip Ahead to activate the evening schedule. Starting early? Press Skip Ahead to advance from your overnight schedule to the normal workday schedule.

Hot Dial Pad

Now you can place a call without first lifting the handset or pressing INTERCOM. With Hot Dial Pad enabled, easily place Intercom calls (without first pressing INTERCOM), quickly place outside calls (using Line Group Access and Direct Line Access), and even use the User Programmable Features.

Cascading Message Notification

When an extension user receives a new message in their mailbox, Cascading Message Notification will call them at up to five preset destinations to let them know a new voice mail message has arrived. A destination can be an outside number (such as a cell phone, pager, or home office) or a co-worker's extension. This new feature requires IntraMail Pro.

Find Me Follow Me

Find Me Follow Me helps a caller locate an extension user who is not at their desk. If their call is unanswered and is picked up by voice mail, the caller can try to locate them at up to three alternate Find Me Follow Me destinations. A destination can be an outside number (such as a cell phone or home office) or a co-worker's extension. Find Me Follow Me requires IntraMail Pro.

Want to learn more about all the DSX Version 3 enhancements? Just click the Introduction tab at left.

How This Manual Is Organized


Introduction provides information about the DSX system’s default feature setup and basic startup programming. You’ll also find handy charts for system codes and capacities, as well as key layout illustrations for each DSX telephone.


Features contains the description, programming, related features, and operation for each DSX telephone system feature. The programming required to customize each feature is presented in a handy, easy to understand, step-by-step guide. For feature operation, use the convenient operation charts at the end of each feature.

IntraMail Features

IntraMail Features gives you description, programming, related features and operation of each IntraMail Voice Mail with Automated Attendant feature.

Programming Options

  • 1000: Programming System Options
    • Use this category for details on the DSX system option programming.
  • 2000: Programming Station Options
    • Use this category for details on the DSX station option programming.
  • 3000: Programming Line Options
    • For details on the DSX line option programming, refer to this category.
  • 4000: Programming IntraMail Options
    • When setting up IntraMail, you’ll find the details on each IntraMail option here.
  • 9000: Maintenance Options
    • The maintenance options are grouped together in this category.