DuraFon PRO Expansion Base

DuraFon PRO Expansion Base

DuraFon PRO-BU

Base Unit for DuraFon PRO Systems

Buy Now

Physical Interface

PRO-BU Base Unit


Line x4
Audio-In x 1 (3.5 mm)
DC x 1

LED Indicators
Electrical Specifications

PRO-BU Base Unit


RF Power
Peak: 708mW; Average: 304mW

Channel Spacing
200 kHz

Number of Channels


Multiple Access
Frequency Hopping TDMA

Frequency Hopping Rate
100 per second

TDMA Frame Length
10 ms

Number of Talk Paths

Receiver Sensitivity
< -108 dBm (@ BER 10-2)

Antenna Connector
Reverse TNC

Antenna Gain
2 dBi (included)
5 dBi External (optional)

TX Power Control Range

Telephone Interface
RJ11 x 4

VoIP Interface

Default IP Address

Default User Name & Pswd

SIP Protocol

Speech Coding
8 kbps G.729A

Channel Coding
8 kbps Convolutional + CRC

Transmission Data Rate
170.678 kbps

User Data Rate
128 kbps duplex

Time Division Duplex (TDD)

Voice Quality

Number of System IDs

Ring Signal
20-50 Hz, 12-90 Vrms

Auto-Attendant Coding
8 kbps G.729

Flash Time
100-900 ms Programmable

Power Source
120V/7V AC/DC Adapter

Charge Time

Charge Current

Battery Talk & Standby Time

Environmental Specifications

PRO-BU Base Unit

Regulation Compliance
FCC Part 15, Part 68

Operating Temperature
14 – 140°F (-10 – 60°C)

Storage Temperature
14 – 158°F (-10 – 70°C)

20 – 75 %

IP Rating

11.0" x 2.1" x 8.5" (215 x 53 x 280 mm)

Device Weight
2 lbs. (907g)

Product Highlights
The EnGenius DuraFon PRO-BU is the expansion base that enables connection of an additional four (4) lines/ports to an existing DuraFon PRO installation.
  • Multi-Line Functionality
  • Supports up to 90 DuraFon PRO or DuraWalkie Handsets
  • Works Behind any Analog Port (PBX, VoIP, PSTN, FXS or POTS)
  • Expandable for Extended User Capacity

Package Includes

1 - Phone Base unit w/ rubber antenna
1 - Base unit AC adapter

Related Products
Base Model Number
DuraFon PRO Base Unit DuraFon PRO-BU
DuraFon PSL Base Unit DuraFon PSL-BU
Handsets Model Number
DuraFon PRO Handset DuraFon PRO-HC
DuraFon UHF Handset DuraFon UHF-HC
Two-Way Radio Only Handset DuraWalkie
Kits Model Number
DuraFon PSL System DuraFon PSL
DuraFon PRO Multi-Handset Kit DuraFon PRO-PIA Kit
DuraFon PRO Multi-Handset Kit w/ Outdoor Antenna DuraFon PRO-PIB-20L Kit
DuraFon PRO Multi-Handset Kit w/ Indoor Antenna DuraFon PRO-PIB-20L-IND Kit
Headsets Model Number
DuraFon & FreeStyl Headset Microphone SN-ULTRA-EPM
DuraFon & FreeStyl “Security-type” Headset Earpiece SN-ULTRA-EPET
DuraFon & FreeStyl "Over-the-Ear" Headset Earpiece SN-ULTRA-EPEH
DuraFon & FreeStyl "Security-type" Headset Earpiece & Microphone SN-ULTRA-EPMT
DuraFon & FreeStyl "Over-the-Ear" Headset Earpiece & Microphone SN-ULTRA-EPMH
External Antenna Accessories Model Number
Outdoor Antenna & Cable Kit SN-ULTRA-AK20L
Indoor Ceiling-Mount Antenna & Cable Kit SN-ULTRA-AK20L-IND
Antenna Coaxial Coupler SN-ULTRA-ACP
Antenna Splitter SN-ULTRA-AS
Lightning Protection Module SN-ULTRA-LPK
Common Handset Accessories Model Number
Battery Pack for DuraFon PRO, DuraWalkie, DuraFon SIP, DuraFon 1X DuraFon-BA
Battery Pack for DuraFon UHF DuraFon UHF-BA
Belt Clip (Handset button w/ swivel clip) for DuraFon PRO, DuraWalkie, DuraFon SIP, DuraFon 1X DuraFon-BC
Belt Clip (Handset button only) for DuraFon UHF DuraFon UHF-BCO
Belt Clip (Swivel clip only) for DuraFon PRO, DuraWalkie, DuraFon SIP, DuraFon 1X, DuraFon UHF DuraFon-BCS
Carrying Case for DuraFon PRO, DuraWalkie, DuraFon SIP, DuraFon 1X DuraPouch
Handset Antenna (Tall, high performance) for DuraFon PRO, DuraWalkie, DuraFon SIP, DuraFon 1X DuraFon-HSA3
Handset Antenna (Stubby, low profile) for DuraFon PRO, DuraWalkie, DuraFon SIP, DuraFon 1X DuraFon-HSA2
Other Accessories Model Number
FreeStyl 1 Replacement Base Station Antenna FreeStyl 1-ANTB
Charging Cradle w/ AC Power Supply DuraFon-CH
Handset Charger for DuraFon UHF DuraFon UHF-CH
AC Adapter for DuraFon PRO Base Unit FreeStyl 1-ACB
DuraFon Battery Cover Replacement DuraFon-HBC
Handset Battery Cover For DuraFon UHF DuraFon UHF-HBC