WSS4 SIP Adapter ATA


WSS4  Analog Telephone Adapters (ATA) series offers high quality low-density access devices used in residential, SOHO and mobile office VoIP applications. It provides reliable, low-cost, and flexible means to deploy converged communication solutions for network operators and enterprises. WSS4 series can be configured as either 2-in-1 with connections to Ethernet and analog phones, or 3-in-1 with connections to Ethernet, analog phones and CO lines. 

Consisting of 3 models, WSS4 series is a desktop and wall mountable. The highly compact hardware with a ARM9 400M CPU supports the Linux kernel, delivering stable performance, high interoperability and compatibility, and rich features. WSS4 series is a cost-effective entry-level VoIP device with the capability and quality seen in expensive VoIP equipments., it is nice VoIP Phone Adapter for VoIP service provider or IP PBX system Integrator;



WSS4 is a multi-purpose VoIP gateway product series designed with the needs of service providers and enterprises in mind. With WSS4 VoIP SIP gateways, service providers can provide telephony and fax services to subscribers using many access methods such as FTTB, HFC, and ADSL. Enterprises can use the WSS4 for IP PBX phone solutions, and the interconnection of multiple sites like PABXs. WSS4 can also serve as a remote SIP terminal for IP-PBX solutions

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 analog phone adapter

      SIP-PSTN analog VoIP ATA adapter

      Support IMS TISPAN Specs

      TR 069 for Management

      RADIUS Client for CDR

      High Speed Fax

Technical Specs





VoIP Specs

Protocols:   SIP and MGCP

Voice Codecs:  G.711u/aLaw, G.729A

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:  ATMEL AT91SAM9G20

DSP:  TI TMS320VC5509A

System Memory: 32M

Flash Memory: 8M

FXO/FXS Connector: RJ11

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 12V/1A

Power Consumption    12W 

Dimension (H x W x D) 150 x 109 x 30 mm 

Weight: Net weight: 0.4Kg; Gross weight (include package): 0.5Kg

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

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



analog phone adapter



Model name FXS ports FXO ports Ethernet ports Power supply
WSS4-1S/1 1 1 2 DC 12V 1A
WSS4-2S 2 0 2 DC 12V 1A
WSS4-2S/2 2 2 2 DC 12V 1A

Above Models with same software and WEB menu;