RS520 VoIP phone

VoIP Phone

The RS520 IP Phone support 2 SIP lines and IAX2, PoE enabled, provided the perfect combination of features and performance for most office workers, an intermediate-level deskset, is providing a perfect combination of features to empower knowledge workers and other critical employees


Technical specs

The RS520 is an advanced, fully featured two-lines IP Telephone that takes full advantage of VoIP technology by offering a flexible, interoperable solution at an affordable price it leverages the SIP standard to provide advanced calling, conferencing, and messaging features, and protects investments with an upgradeable flash-based architecture.

Feature Highlights

Two lines / call appearances with LEDs

Conference calling (with or without server)

Call transfer (blind or consultative)

Call hold, call waiting, and call forwarding

Caller ID and Call-waiting caller ID

Do not disturb

Number note pad


Auto answer

Configurable dial plan

500 entry phone book


User Interface

Keypad dialing

Speed dial from phone book and call log

100 number redial list

Menu layout for easy navigation via softkey

Missed / outgoing / incoming call logs, 100entries each voicemail retrieval via keypad or programmable keys

8 distinctive ring tone

Volume and Ringer level control

4 or 12 (with expansion module ) programmable keys for speed dial or feature access.


Configuration and Management

Simple Web-based configuration and status check

Auto-provisioning using TFTP

Update phone book remotely via web browser

Software upgrade via TFTP or FTP


Enterprise Functionality

Integrated 2 port 10/100 Mbps Ethernet switch

Hands free full-duplex speaker phone

802.3af Power over Ethernet

Headset jack (RJ9)

VLAN and DSCP support


Technical Specification

Protocols Supported:

SIP (RFC3261, RF3262)

SDP (RFC2327)

(SIP) Subscribe / Notify ( RFC3265)

(SIP) Offer / Answer Model ( RFC3264)

(SIP) Refer Method ( RFC3515)

DTMF transport ( RFC2833)

SIP INFO and in-band DTMF transport

RTP / RTCP (RFC3550, 3551)

(SIP) DNS SRV ( RFC2781)


Peer to Peer calling



WAN / LAN: Support Bridge and Router mode

Support basic NAT and NAPT

PPPoE for xDSL.

DHCP Client/Server

Support DNS Relay, SNTP Client, Firewall

Network tools in telnet server: including ping, race route, telnet client



DiffServ / IP Precedence; IEEE802.3p


Audio / Codec:

G.711 A law and G.711 U law 64K



DTMF tone Generation

Acoustic echo cancellation

Built-in audio mixer



Two level password access


User level configuration and Status:

 Brower based configuration interface and status page

Edit phone book and programmable keys using web interface

LCD display for access to configuration and customized setting


Operating Environment:


Relative Humidity:20% to 85%, non-condensing




Weight: 0.85kg/1.35kg (shipping weight)

Color : Black or Almond


IP phones