WSS120 VoIP Gateways


WSS120 series VoIP Access gateway are a telecom carrier class VoIP Gateway designed for regular phone service, Fax service and IP Centrex service,WSS120 VoIP SIP gateways  can be used by carrier and enterprise as part of the cost effective IP-PBX solutions;

WSS120 VoIP Gateways is the newest family in RealTone’s WSS series VoIP gateway products.  It offers maximum capacity of 96 FXS lines and/or FXO lines, suitable for carrier and medium enterprise VoIP deployment. 



WSS120 analog VoIP Gateways bridges legacy telecom terminal equipments, such as telephone, FAX machine,  enterprise PBX,  etc, into IP  based voice network that constructed by the carrier or enterprise itself.  When placed at network side connecting with PSTN switch, WSS120 can be use to bring remote VoIP user into PSTN network. For IP based Call Center solution, WSS120 is the idea remote access gateway for thr operators. WSS120 adopts modular design, can flexible configure FXS/FXO line capacity and DSP resource to gain best performance to cost ratio.

WSS120 designed with 1U (up to 48 analog lines) or 2U (up to 96 analog lines) high and 19'' wide compact chassis. Full capacity system consumes maximum 125W power, and can be either 110-240V AC or -48V DC input.

Main Applications:

       Residential telephone service or IP-centrex with IMS platform

       Local or remote VoIP access gateways for IP PBX application Enterprise, Government branches, Hotel and schools

       Interconnection for PABXs, or Lines extension;

       VoIP Long Distance application for IP phone supermarkets and enterprises 
Carrier primary and secondary line service

Key Features:

      SIP or MGCP VoIP Access Gateway

      SIP-PSTN analog VoIP Gateway

      Support IMS TISPAN Specs

      TR 069 for Management

      RADIUS Client for CDR

Technical Specs





VoIP Specs

Protocols:   SIP and MGCP

Voice Codecs:  G.711u/aLaw, G.729A, G.723.1, GSM, iLBC

DTMF Method:   RFC2833, SIP INFO, In-Band

G.168 Echo Cancellation

T.38 fax relay, T.30 fax transparent

VAD: Voice Active detection

CNG: Comfort noise generation

Dynamic jitter buffer management Static jitter buffer

QoS:  IEEE 802.1p tag

           DiffServ code point (TOS) bits

Encryption for RTP and SIP packages





DHCP Client

PPPoE Client


NAT traversal (STUN)







FXS Ports

Dialing support both of DTMF and Pulse

Polarity inverse generation

Caller ID generation (FSK/DTMF, before ring and after ring)

Ring cadence setting

Ring frequency setting

Volume control

Hook flash timing setting

Message waiting indicator (FSK, polarity inverse)






FXO Ports

Polarity inverse detection

Caller ID detection (FSK/DTMF, before ring and after ring)

Busy tone detection

DTMF out-pulsing timing setting

Volume control

Ring timing setting

Automatic attendant (2nd  stage dialing)

Direct inward dialing DID













Call Features

Blind/Explicit  transfer

Call forward

Call Waiting

Caller ID by number or name

Caller ID blocking

Caller ID on call waiting

Distinctive ring

Do not disturb

Music on hold

Color ring back tone

Call progress tone (Configurable)

Release control (Called party control, calling party control)

Three-way calling

Speed dialing

Calling and called number based routing

Call number transformation (Add, delete, replace)

Hunt group (Sequential and circular hunt)

Ring group

Digit map

PSTN failover

Peer to Peer calls without SIP server

Intercom PBX function






TR069-based management (Include TR069, TR104, and TR106)



Web-based management interface (Local and remote access)

Configuration files import and export by WEB

System status monitoring and statistics by WEB









Processor:  FREESCALE PowerQUICC MPC8247

DSP:  TI TMS320VC5509A

System Memory: 128M

Flash Memory: 16M

FXO/FXS Connector: RJ45

Off-hook Detection: Loop start or DDI

Max. User Line Length 1500 meters

Ring Voltage: 60V 20 RMS

OnHook Voltage: -48V

Ring Equivalent Value  5 REN (short distance)

Power supply 100~240V AC, 50/60 Hz, 1A max

Power Consumption    125W max

Dimension (H x W x D) 44 x 440 x 300 mm (1U)   88 x 440 x 300 mm (2U)

Weight: Net weight: 6.1Kg; Gross weight (include package): 9.8Kg

Operating Temperature: 0~40 ℃; Humidity: 10%~90% (non conducing)

Non Operating Temperature: -10~60 ℃; Humidity: 5%~90% ( non conducing )



VoIP Gateways

VoIP access gateways



Model name FXS Ports FXO ports Ethernet Ports Rack-Mount
WSS120-96S 96 0 2 2U chassis
WSS120-72S 72 0 2 2U chassis
WSS120-96FXO 0 96 2 2U chassis
WSS120-72FXO 0 72 2 2U chassis
WSS120-48FXO 0 48 2 1U chassis
WSS120-32FXO 0 32 2 1U chassis
WSS120-24FXO 0 24 2 1U chassis
WSS120-88S/8 88 8 2 2U chassis
WSS120-80S/16 80 16 2 2U chassis
WSS120-56S/16 56 16 2 2U chassis
WSS120-24S/24 24 24 2 1U chassis
WSS120-72S/24 72 24 2 2U chassis
WSS120-48S/24 48 24 2 2U chassis
WSS120-36S/36 36 36 2 2U chassis
WSS120-48S/48 48 48 2 2U chassis
WSS120-40S/8 40 8 2 1U chassis
WSS120-32S/16 32 16 2 1U chassis
WSS120-64S/8 64 8 2 2U chassis

Above Models with same software and WEB menu;