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GSM Gateway

GSM Gateway


KNXSGSM-8 GSM Gatway is a multi-functional product used to effectively implement the smooth transition between PLMN (GSM) and VoIP network. The GSM/CDMA VoIP gateway is designed for comfort, ease-of-use to satisfied necessary of customers. It is not only inherits tradition of quality voice communication over IP network but reduce the human resource of VoIP network deployment. It’s a cost-effective gateway for call termination (VoIP to GSM) and origination (GSM/CDMA to VoIP). It is fully compatible with leading soft switch and SIP server.

Open third-party API development interface

The wireless convergence gateway provides an open HTTP API interface for users to perform secondary development for certain services such as SMS and USSD, and integrate with external applications (Apps) such as the customer's call center system and voice communication system. The wireless convergence gateway can be used as the short message receiving and transmitting channel of the system, using TCP bearer, adopting the request/response method, and all the digital type fields use the network sequence. And support SMS to Email and Email to send text messages to enrich the enterprise's communication applications.

Call record query
Call Detail Record (CDR) records the detailed call information of the incoming and outgoing calls through the gateway, including the call origination/end time, the calling and called number, the duration of the call, the codec, the reason for the hang up, etc., and the user can view the call in real time. The situation and the inquiry of the historical bill, the tracking inquiry of the missed call, and the fault location processing of the abnormal bill.
TLS and SRTP encryption protocols
The wireless convergence gateway supports SIP TLS and SRTP communication encryption mechanisms. When TLS is used to transmit SIP packets, the SIP packets are encrypted and transmitted throughout, protecting user data from being stolen by others, improving the security of voice communication. Supports the Secure Real-time Transport Protocol (SRTP), which encrypts, authenticates, and retransmits RTP/RTCP packets by encrypting payloads of RTP/RTCP packets.

Rich application and flexible networking
The Wireless Converged Voice Gateway is a versatile product for seamlessly connecting PLMN mobile networks and VoIP voice networks, and inherits the SMS transmission and reception and USSD interaction functions of mobile terminals. It adopts the standard SIP protocol and can exchange softswitches with various SIPs. Docking, realizes mobile network and IP voice network signaling interaction and voice call function; provides balance inquiry, balance alarm, call minute limit and other functions, and supports flexible call control strategy, which can quickly build low-cost, flexible and diverse PLMN-to - IP communication system.

==>>>> Product Specification

Key benefits

8 GSM channels 

SMS sending and receiving 

LINUX platform 

PSTN and VoIP hotline 

Carrier select 

USSD, open API for SMS GSM: Quad-band 850/900/1800/1900MHz 

Up to 8 concurrent calls 

PIN modified 

Flexible dial plan, digit map



G.711A/U law, G.723.1, G.729A/B 

Silence Suppression & Detection 

Comfort Noise Generation(CNG) 

Voice Activity Detection(VAD) 

Echo Cancellation(G.168) 

Adaptive (Dynamic) Jitter Buffer 

Call Progress Tone Generation 

Programmable Gain Control


SIP Characteristics

By port registration 

By device registration(share account) 

Support IP trunk and IP trunk group 

Two 183 mode 

Response code switch 

All ports busy, redirected to other device


Mobile Specifications

Frequency Range: 

GSM : 850/900/1800/1900MHz (optional) 

WCDMA : 900/2100MHz (optional) Or 850/1900MHz (optional) 

DTMF mode: Signal/RFC2833 


Provide API interface 

Call duration limitation 

One/two stage dial-up, Hotline 

Polarity Reversal 

Custom IVR 

PIN modified 

Carrier select 




Network Features

IM card slot: 8 GSM channels 

Ethernet Interface: 4*10/100M Base-Tx RJ45 

Static IP, PPPoE, DHCP 

Network Protocol Support: 


Ping, NTP, SNTP, Http, DNS 

NAT traversal: 

Static NAT, STUN 

Static/dynamic ARP request 

Up to 32 routing 



Physical properties
Power: 220 VAC 
Temperature(operation): 0 ℃ ~ 45 ℃ 
(storage): -20 ℃ ~80 ℃ 
Operation Humidity: 10%-90% no condensation 
Dimension(w/D/H): 440*307*44.5mm 
Weight: 4.2kg


Maintain & Upgrade

Web based configuration 

Telnet configuration 

Configure backup/restore 

Support English and China language 

Firmware upgrade by TFTP 

Web & telnet login password modify 

Factory reset 

Output CDR/Tracking news by syslog 

Ping and Tracer test on web 

Traffic statistics: TCP,UDP,RTP 

VoIP call statistics 

PSTN call statistics: ASR,ACD,PDD


Packing Content


RJ-45 Network cable 


User’s Manual CD


==>>>>Telephone System

GSM Gatway system

==>>>>Product Application

GSM Gatway system

==>>>>Product Detailed Pictures
GSM Gatway
GSM Gatway
GSM Gatway
GSM Gatway

==>>>>Product Video

==>>>>Please Email US marketing@koontech.com

This product model:KNXSGSM-8