Huawei IP Phone eSpace
7810&7820&7830&7850&7870&7803X
Administrator Guide
1 Overview
Issue 01 (2011-12-31)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
2
If the network is in a good condition, G.711 is recommended, and the voice quality will be excellent. If
the network is not in a good condition, G.729AB or G.723 is recommended.
PoE Function
eSpace 7870, 7850, 7830, 7820 and 7810 support the PoE function. When not being
connected to a power adapter, a client can obtain power from a PSE device (a PoE switch
such as the S3900) to work normally. eSpace 7870, 7850, 7830, 7820 and 7810 support the
mode of free-line power supply and mode of signal-line power supply. When the PoE function
is used, the reliable power supply distance is up to 100 meters.
Bridging Function
eSpace 7870, 7850, 7830, 7820 and 7810 support the bridging function. The device connected
to the PC port of an IP phone can access the network connected to the LAN interface of the IP
phone and can communicate with other devices in the network. In this case, the IP phone acts
as a switch with two interfaces but the working mode is different from the working mode of a
normal switch. Special configurations are performed at the lower layers of an IP phone to
separate the broadcast packets between the two interfaces. Therefore, the IP phone is not
affected by a large number of broadcast packets.
DSP Functions
The DSP chip of eSpace 7870, 7850, 7830, 7820 and 7810 supports comfort noise generation
(CNG) and voice activity detection (VAD). These functions are controlled by the DSP
automatically, which can be set on web pages. You can enable this function by selecting
Enabled
in
Voice
on the
Phone
page of the web configuration interface.
VLAN Function
eSpace 7870, 7850, 7830, 7820 and 7810 support the Virtual Local Area Network (VLAN)
function. The packets sent by an IP phone are labeled with tags. This makes packets
transmitted in a separate voice VLAN, and the stability of VoIP packets is ensured.
QoS Functions
The eSpace 78XX-series IP phones support the layer 2 quality of service (QoS) technology
based on 802.1q and 802.1p and the layer 3 QoS technology based on ToS. The deployment
of QoS on the VoIP bearer network ensures the voice quality during the transmission.
PPPoE Function
eSpace 7870, 7850, 7830, 7820 and 7810 support the PPP over Ethernet (PPPoE) dialing
function. By using the preset PPPoE user name and password, an IP phone can initiate the
PPPoE dialing and set up a connection with the softswitch through ADSL. This facilitates the
setup of VoIP conversations.
1.3 Network Introduction
In terms of network features, eSpace 78XX-series IP phones can be deployed on enterprise
networks to interoperate with application servers such as the IP PBX and UMS servers,
