Huawei eSpace U1981 Unified Gateway - Huawei Products
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Huawei eSpace U1981 Unified Gateway

Huawei eSpace U1981 unified gateway (U1981 for short) is a core voice gateway in the Huawei Unified Communications (UC) solution. It works with Huawei IP terminals and UC applications to provide professional IP telephony (IPT) and UC services.
U1981 uses the SIP architecture, features high integration, and supports 1,000 users per subrack. U1981 also provides powerful networking capabilities. In the downstream direction, it supports both narrowband and broadband access, allowing for hybrid networking of analog phones and IP phones. In the upstream direction, it can connect to the public switched telephone network (PSTN) or to voice switches in private networks using digital, analog, and broadband SIP trunks.

High integration and impressive array of functions

  • Extensive IPT services
  • Built-in hi-fidelity audio conferencing, with multiple conferencing modes available
  • One Number Link You (ONLY), allowing users to answer incoming calls from anywhere, at any time, in the way that users prefer
  • Built-in voice mailbox, recording messages from unanswered callers so users never miss any important calls
  • UC application extension

  • High stability and high reliability

  • 99.999% carrier-class reliability
  • Redundancy backup for key modules

  • Effective cost control

  • Number analysis and whitelist/blacklist
  • 32-level customized call rights
  • Password-based call barring
  • Intelligent routing, saving communications costs

  • Quick deployment and easy maintenance

  • GUI-based deployment tools for easy and quick installation
  • Unified network management system, helping improve management and maintenance efficiency
  • Built-in web management system for convenient operations

IP PBX

U1981 can function as an IP PBX. As shown in the following figure, a U1981 is deployed at the headquarters of an enterprise to provide call control services for users over the enterprise's network. The branches, according to their user capacities, can use different models of Huawei eSpace U1900 series unified gateways as local voice gateways. These local voice gateways support local regeneration. U1981 at the headquarters and the local voice gateways at the branches can connect to the PSTN using narrowband and broadband trunks. They can also connect to multiple types of terminals, including SIP phones, integrated access devices (IADs), analog phones, and fax machines, to provide a rich array of voice services for users.


U1981 supports two deployment modes to ensure a highly reliable IPT solution: local two-node clustering and remote disaster recovery.


Parameter Specification
User capacity per U1981 A maximum of 10,000 users (including 160 directly-connected analog phone users)
Terminals supported Analog phone, IP phone, video phone, and soft terminal
Trunk ports A maximum of 60 FXO ports, 12 E1/T1 ports, and 20 BRI ports
Signaling protocols PRI, QSIG, SS7, R2, and SIP
Codecs G.711a/μ, G.729a/b/ab, iLBC, and G.722/G.722.1/G.722.2
Conference capacity A maximum of 360 participants
A maximum of 120 conferences, with a maximum of 60 participants per conference
Built-in voice mail 30 channels concurrently
Built-in 16G SD storage card
Power supply AC: 100–240 V AC, 50/60 Hz
DC: –38.4 to –60 V DC, typical value: –48 V DC
Two power modules in 1+1 backup mode
Power consumption 220 W (in full configuration)
Dimensions (H x W x D) Standard 19-inch 2U subrack
86.1 mm x 442 mm x 310 mm
Weight 10 kg (in full configuration)
Environment Storage temperature: –40°C to +70°C
Long-term operating temperature: 0°C to 45°C
Short-term operating temperature: –5°C to +55°C
Operating humidity: 5% to 95% relative humidity (RH), no condensing
Air-filtration systems should be deployed in the operating environment. Air-borne dust potency should be less than 180 mg/m³.
System reliability ≥ 99.999%
Mean time between failure (MTBF): 30 years
Manageability Centralized/Remote device management, signaling tracing, resource management, and alarm management

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