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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.

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  • توضیحات
  • Application scenarios

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


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.

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