General
Product type	Wireless expansion handset answering machine
Compatible platforms	HiPath
Colour housing	Silver
Standard for cordless phones	DECT
Bluetooth profiles	Hands Free Profile (HFP), Headset Profile (HSP), Object Push Profile (OPP), Serial Port Profile (SPP)
Call services	Voice Mail, Caller ID
Dialer type	Keyboard
Position of dialer	Handset
Function keys	Voice Mail button, hands-free button, navigator button, R-button (Flash / Hookflash)
Chime tone	20
Displays	Visual doorbell light indicator
Additional functions	Built-in clock, Alarm
Additional features	Key lock, PIN code, vibration, compatible with Bluetooth headsets
Phonebook capacity	500 Names and numbers
Memory for stored numbers	20
Display type	LCD display - colour
Display location	Handset
Screen resolution	128 x 128 Pixel
Features	Screensaver
Antenna	Internal
Connections	Headset jack / Sub-Mini-Phone 2.5 mm ¦ USB
Battery capacity	750 mAh
Battery type	Lithium-ions
Intercom system
Speakerphone
Automatic redial
Menu operation
Loudness control
Chime setting
Polyphonic ringtone
Backlit keypad
Computer connection
Backlit
Audible battery alarm

The Unify OpenStage SL4 professional is a cordless expansion handset for enterprise communication systems on the HiPath platform. It serves as a mobile extension for existing telephone systems and enables the use of voicemail functions as well as a wide range of communication services. The device is silver in colour and features integrated DECT technology, ensuring a stable wireless connection indoors. Communication takes place via a digital duplex system, allowing simultaneous speaking and listening, thereby improving call quality in hands-free mode.

Applications

The OpenStage SL4 professional is designed for use in office environments and small to medium-sized enterprises requiring flexible and mobile communication within a HiPath system. It is particularly suitable for employees who frequently switch workstations or work remotely. The integrated voicemail function (Voice Mail) and caller ID display support efficient communication management. Compatibility with HiPath systems enables access to central services such as call forwarding, conference functions, and call diversion.

Functions and Equipment in Detail

The device features an illuminated keypad and a colour LCD display with a diagonal size of 4.6 cm (1.8 in) and a resolution of 128 x 128 pixels. The display is backlit and shows information such as incoming calls, contact data, and menu options. The keypad includes a navigation key, a Voice Mail key, a hands-free key, and an R key (for Flash/Hookflash). Volume control and ring tone settings allow individual adjustment to the respective environment. There are 20 different ring tones available, including multi-tone ringtones. A visual ring indicator light signals incoming calls optically.

Technology Explained Simply

The wireless technology is based on the DECT standard, developed for cordless telephones in office environments. The internal antenna ensures a reliable connection without visible antenna elements. Power supply is provided by a rechargeable lithium-ion battery with a capacity of 750 mAh. An audible battery alarm warns of a critical charge level. The integrated clock and alarm function support daily use. The key lock and PIN code offer additional security. The vibration setting enables discreet notification for incoming calls.

Compatibility and Accessories

The device is specifically developed for integration into HiPath systems and supports required call services such as voicemail and caller ID. It is compatible with Bluetooth headsets and supports the profiles Hands Free Profile (HFP), Headset Profile (HSP), Object Push Profile (OPP), and Serial Port Profile (SPP). Connection interfaces include a headset jack (Sub-Mini-Phone 2.5 mm) and a USB port. The charging cradle is included in the delivery and enables charging of the device via the network.

Mounting and Installation

Installation is performed by connecting the handset to the charging cradle, which is connected to the HiPath system. Communication is established via the DECT network. Configuration is done through the device’s menu, with menu operations and automatic redial simplifying operation. The phonebook display with up to 500 entries and a memory for 20 recently dialed numbers support daily use.

Advantages in Operation

The OpenStage SL4 professional offers high mobility within the corporate network without losing the functionality of a landline telephone. The integrated voicemail function and hands-free function increase efficiency in daily work. Bluetooth support enables connection to external headsets, making use in the office or during meetings easier. The digital duplex technology ensures clear voice transmission in hands-free mode. The included charging cradle ensures simple and secure recharging.