GSM 4 ports high quality small sms gateway bulk sms modem

GSM  4 ports  high quality small ports sms gateway bulk sms modem 

SK4 is a multi-functional and high performance product, which convert GSM network to VoIP.
It supports 4 calls concurrent.With multiple call duration control and unique human behavior , 
customers can get high performance easily. It is widely used in call termination,call center, 
enterprise communication,sim active, sms verify code, sms termination, automated appointment reminder service,sim recharge and corporate sms,sms mobile marketing,wallet payment system etc.

Funtion

4-4 series is able to process traditional voice call service and internet data service. 
Compare to the 1-1 GSM/CDMA/WCDMA/LTE series VoIP Gateway,
4-4 series adapt new hardware and software structure, which supports up to 4 concurrent calls.

1) Support 4/8/16/32 Ports, auto sim switch by call minutes/SMS limit per sim/day.
2) 2G/3G/4G models all available.
3) Support work with Call Center Software, IPPBX, 3CX,Elastic,Asterisk, Vos,VPS, Freeswitch, Softswitch Cicso etc.
4) Free Firmware Version upgrade online and Remote Centralized Management.
5) Free lifetime Tech Support 7x24x365

Special Features:
1.Support G729a/b/e,G723.1,G.711 A/U law, iLBC auto-selecting
2 EBO( Bandwidth Optimization)
3.Proxy Encryption Solution for IP Block
4.Support SIM Bank
5.VPN(pptp)
6.SIM Card Rotating(4-4)
7.Solution to solve the SIM card blocked
8.Accumulated Call Duration
9.Accumulated Connected Calls
10.Accumulated Calls
11.Consecutive Failed Calls
12.Consecutive No-Alert Calls
13.Consecutive No-Answer Calls
14.Consecutive No Carrier Calls
15.Consecutive Short-Duration Calls
16.Station intelligent switching
17.ERMS( Remote Management System)
18.Port Inter-Calling
19.Fake Ringback
20.Call Duration Limitation for SIM Card/Single
21.Dial Plan/Prefix Inward Translation/Intelligent Routing
22.Web Browser: Firefox/Chrome /IE/Opera

Mobile Features:
1.SMS and call Send, Receive and Forward(GSM/SIP/HTTP)
2.SMS Inbox
3.AT Command , USSD
4.SMS Format: PDU/TXT
5.PIN Code Management
6.CDMA Delay Answer
7.GSM Polarity Reversal
8.Carrier Selection
9.Caller ID Hidden(need SIM Card support)

Maintenance and Management:
1.Multi-language Interface
2.USB Serial COM
3.Configuration Backup and Restore
4.Support HTTP/TFTP Upgrade
5.Call statistics: ASR,ACD,PDD
6. Remote Management System

Frequency Bands
2G/3G/4G( seperate models)
2G:850/900/1800/1900Mhz
3G: 800/850/900/1700/1800/1900/2000/2100Mhz
4G: FDD-LTE/TDD-LTE (4G Frequency difference frequencies for different areas contact us for details

Network Protocols:
DHCP/PPPoE/VPN(pptp)
NTP
Telnet/HTTP/FTP/TFTP
Encryption:,VOS2000,RC4,XOP.Base64

Telephony Features: Hot-line call ,Dial plan, Speed dial, Phone book, CDR, LCR, White/Black list

Telephony Signaling: 
DTMF tone dectection/generation
DTMF relay: in-band, RFC 2833 and SIP info
Call forward: unconditional, no answer and busy
N-way conferencing
Caller ID display/generation, Mobile Number Portability

Voice Capability:
Voice codecs:G729a/b/e,G723.1,G.711 A/U law, iLBC
Echo cancellation
Silence suppression & detection(VAD, CNG)
Adaptive jitter buffer
Volume adjustable
IVR customized

SMS Capability: 
WEB/HTTP/SMPP Client & Server
Bulk Receive/Send SMS 
SMS to Email, Email to SMS
Flash sms,silent sms, emoji and long sms

Anti-sim blockage Solution: 
Human behaviour feature
* IMEI modify & Band & PIN Modify
* Port Inter-calling/sms
* Base Station intelligent switching 
* Multiple SMS control
* Access to internet surfing
* Call wait
* Call duration control 
* Internet surfing

Special Features
* SMS Send, Receive and Forward online
* AT/USSD command
* SMPP server/client
* HTTP API for SMS/USSD/AT Command
* SMS checking
* Get SIM Number/Balance auto 
* SMS statistics
* Auto Recharge

VOIP solution

Packaging & Shipping

4 pieces antennas
1 UK/EU/US/AU/JP/CCC power plug for reference
1 power adaptor with 12V/8A
1 network cable
1 USB cable

 Our Services

>We provide strong technical support about VoIP service and A-Z call and sms traffic termination(7 days*24 hours)

>We can help you rent a VoIP server in USA

>We can provide copy version VOS

>We can instal Relay server, SMS server, SMB server for you.(for free)

>We can offer voip terminal guide

>We would lke to buy your termina routes.

Company Information

SKYLINE INTERNATIONAL COMMUNICATION Co., Ltd. is a manufacturer of VoIP Gateways,GSM VoIP gateways, with well-equipped testing equipment and strong technical force. 
With a wide range, good quality, reasonable prices and stylish designs, our products are extensively used in communication industry and other industries. 
Our products are widely recognized and trusted by users and can meet continuously developing economic and social needs.

                       FAQ

If you have any questions, ask me freely by below contact details:

skype/whatsapp/telegram/wechat : 

008618665362836  Tina Kong

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