What does it do?
Wireless phones keep staff who are away from their desks reachable on their PBX extension anywhere on site. The Mitel OpenScape family offers three DECT architectures and one WLAN option. The right one depends on the PBX type, the area to cover, the number of handsets and the alarm requirements.
With OpenScape Business integrated DECT, base stations connect to the PBX's digital (UP0/E) ports and handsets use almost all PBX features. With OpenScape Cordless IP V2, base stations connect directly to the LAN (Ethernet, PoE) and work over SIP; it is the only option on Business S and scales to tens of thousands of handsets in large installations. OpenScape Cordless Enterprise is based on OpenScape 4000 boards, carries the PBX features to the wireless subscriber and allows roaming across 32 OpenScape 4000 systems in a network.
WL4 and WL4 Plus are not DECT: they are WLAN phones that work over SIP on the existing enterprise Wi-Fi. Voice and data share one network, but the Wi-Fi must be configured to carry voice (QoS, fast roaming, cell planning). On the handset side, SL7, S6 and R6 cover the office and general sites, and the M3 family covers IP65 industrial and ATEX environments.
Who is it for and in which environment?
Nurses and doctors reachable in corridors, operating theatres and the emergency department. Nurse call and alarm messages reach the handset through the OScAR alarm server.
M3 Ex and M3 Ex Plus for explosive atmospheres (ATEX gas zone 1, dust zone 21). Man-down and no-movement alarms for lone workers.
Dust- and water-resistant (IP65) R6 and M3. If the Wi-Fi is ready for voice, WL4 on the same network as scanners and terminals.
SL7 and S6 handsets. OpenScape Business integrated DECT in a single building; Cordless IP V2 or OpenScape 4000 with Cordless Enterprise across multiple buildings.
Wireless extensions for housekeeping and technical staff. In smaller properties OpenScape Business integrated DECT is sufficient.
Handsets and key features
- SL7: slim, light (104 g) office handset; works with OpenScape Business, OpenScape 4000 (V8 and later, Cordless Enterprise LW V7R1.31 and later) and Cordless IP V2
- S6: general office use (118 g); S6 Base for a small system on an analog port (6 handsets, 2 simultaneous calls)
- R6: IP65, LED usable as a flashlight; for warehouses, technical service and field teams
- M3 family: IP65, shock-resistant, −10…+55 °C; M3 Ex / Ex Plus ATEX gas zone 1 (II 2G Ex ib IIC T4 Gb) and dust zone 21 (II 2D Ex tb IIIC T120°C Db)
- M3 / M3 Ex: emergency call key, out-of-range and low-battery alerts. M3 Plus / Ex Plus: man-down, no-movement, escape, pull-cord and technical alarm; with or without OScAR
- With OScAR (via Cordless IP V2): location by base station and signal strength, acknowledged text messages, personal security alarms
- WL4: 802.11 a/b/g/n/ac, SIP, SRTP/TLS, WMM and fast roaming with 802.11r/k; IP44
- WL4 Plus: alarm button, man-down, no-movement, automatic call after alarm, push-to-talk (PTT); location via BLE beacons
- WSG: central management, messaging and alarms for WL4; LDAP and OScAR interface
- DECT runs in its own protected 1880–1900 MHz band and does not share capacity with Wi-Fi traffic
System comparison
| OpenScape Business integrated DECT | Cordless IP V2 | Cordless Enterprise | WL4 (WLAN) | |
|---|---|---|---|---|
| PBX | OpenScape Business X1–X8 | OpenScape Business (only option on Business S), OpenScape 4000, OpenScape Voice | OpenScape 4000 | OpenScape 4000 V8+, OpenScape Business V3+, OpenScape Voice V9+ |
| Base station / access point connection | PBX UP0/E port | Ethernet, PoE (802.3af class 2) | UP0/E via SLMC board; 1–3 ports per base | Existing enterprise Wi-Fi access points |
| Max. base stations | X1: 7 · X3/X5R: 7 (15 with SLU8N) · X8: 64 | By installation size ¹ | 24 UP0/E ports per SLMC | Depends on Wi-Fi design |
| Max. handsets | X1: 16 · X3/X5R: 64 · X8: 250 | By installation size ¹ | Depends on board and license configuration | Depends on Wi-Fi design |
| Simultaneous calls | X3/X5R: 48 · X8: 128–192 | By installation size ¹ | 12 DECT channels per base | Depends on access point capacity |
| Roaming | Within one system | Handover domain of 10 DECT Managers | Across 32 OpenScape 4000 systems in a network | 802.11r/k, OKC |
| Feature set | PBX HFA features | SIP features | OpenScape 4000 features | SIP features, messaging, alarms (Plus) |
| Coverage (per base) | Depends on base station type | ~50 m indoors, ~300 m outdoors | ~50 m indoors, ~300 m outdoors | Depends on Wi-Fi cell plan |
| ATEX handset | M3 Ex / Ex Plus | M3 Ex / Ex Plus | M3 Ex / Ex Plus | None |
Source: OpenScape Business V3 Feature Description, OpenScape Cordless IP V2 Data Sheet, OpenScape 4000 V11 Feature Description and System Components, WL4 / WSG Data Sheet and Planning Guide. The exact number of base stations and handsets is fixed in the BOM after the coverage survey and licensing. ¹ By installation size: small 10 bases / 60 handsets / 20 calls; medium 60 bases / 250 handsets / 60 calls; large 60 bases per DECT Manager, 20,000 handsets and 6,000 calls per system.
DECT or WLAN phone?
- Its own 1880–1900 MHz band; not affected by Wi-Fi load
- More simultaneous calls per transmitter and longer range
- The only option for explosive atmospheres: M3 Ex / Ex Plus
- A separate base station network is installed
- Uses the existing enterprise Wi-Fi; voice and data on one network
- Same infrastructure as scanners and terminals in healthcare, retail, logistics and manufacturing
- Wi-Fi needs WMM QoS with 802.11k and 802.11r enabled together; at least −70 dBm at the cell edge
- A site survey is required with more than four access points or in RF-dense environments
What Promark delivers
- Site survey: floor plans, existing PBX, cabling and Wi-Fi infrastructure
- DECT coverage measurement and base station placement plan
- Wi-Fi readiness check for WLAN phones: QoS, roaming, channel and cell plan
- Datasheet-based design; BOM and license list within 24–48 hours
- Installation of base stations, handsets and WSG; integration with the PBX
- Commissioning of alarm, man-down and messaging scenarios with OScAR
- Annual maintenance; field service across Türkiye and in Turkmenistan
Sectors
Related catalog products
Frequently asked questions
Should I choose DECT or WLAN phones?
WL4 makes sense if your Wi-Fi is built to carry voice (WMM QoS, 802.11k/r, sufficient cell overlap) and staff already use Wi-Fi devices. DECT is chosen when the Wi-Fi is busy, when range and call capacity matter or when there is an explosive atmosphere; in ATEX areas only M3 Ex / Ex Plus can be used. During the site survey we compare both options for coverage and cost.
What is the difference between Cordless IP and Cordless Enterprise?
With Cordless IP V2, base stations connect to the LAN via Ethernet and PoE and register with the PBX over SIP; on OpenScape Business it is an alternative to integrated DECT and on Business S the only option. Cordless Enterprise is based on OpenScape 4000 SLMC boards, base stations connect via UP0/E and the PBX features are carried to the wireless subscriber, with roaming across 32 OpenScape 4000 systems in a network.
Which phone can be used in an ATEX zone?
OpenStage M3 Ex and M3 Ex Plus are certified for gas zone 1 (II 2G Ex ib IIC T4 Gb) and dust zone 21 (II 2D Ex tb IIIC T120°C Db). Both are DECT handsets; there is no ATEX version of the WL4 WLAN phone. M3 Ex Plus also provides man-down, no-movement and escape alarms.
Is there a phone with a man-down alarm for lone workers?
Yes. On DECT, M3 Plus and M3 Ex Plus support man-down, no-movement, escape, pull-cord and technical alarms. On WLAN, WL4 Plus provides an alarm button, man-down, no-movement and an automatic call after an alarm. Who receives the alarms, in which order and with which location information is set up with the OScAR alarm server.
How many DECT handsets can OpenScape Business support?
With integrated DECT, up to 16 handsets on X1, 64 on X3 and X5R and 250 on X8. The number of base stations is 7 on X1, 7 on X3 and X5R (15 with the SLU8N board) and 64 on X8. For more handsets or on Business S, Cordless IP V2 is used.
What does the Wi-Fi need for WLAN phones?
WMM QoS must be enabled; DSCP 46 is recommended for voice (RTP) and DSCP 26 for signalling (SIP). For fast roaming, 802.11k and 802.11r are enabled together. At least −70 dBm at the cell edge and 6–10 dB overlap with neighbouring access points are required. On 2.4 GHz only channels 1, 6 and 11 are used; DFS channels are avoided for voice.
Send us the PBX type, the area to cover (floor plans if available), the number of handsets and any ATEX or alarm requirements by WhatsApp. We return a BOM and quote within 24–48 hours. Across Türkiye and in Turkmenistan.