Shenzhen Ejoin Technology Co., Ltd.

Add : 3rd Floor, Wanyuan Business Building,Liuxian NO.2 Road ,71 Block , Bao an District. Shenzhen City, P.B China
 Tel : +86 755 85245166 Fax : +86 755 85245122
Copyright © Shenzhen Ejoin Technology Co., Ltd.2017. All Rights Reserved | 粤ICP备15045977号 



EjoinTech is a professional developer and manufacturer of VoIP products. EjoinTech provides ACOM brand VoIP communication devices and solutions.

ACOM516-256 VoIP Gateway
EjoinTech is a professional developer and manufacturer of VoIP products. EjoinTech provides ACOM brand VoIP communication devices and solutions. And we also offer customized products and OEM service. They are a cost-effective gateway for SOHO, SMEs and system integrators and it also opens up new revenue generating opportunities for service providers. 
ACOM516-256 GSM VoIP Gateway is a multi-functional and high performance product, which is designed with advanced embedded technology and every channel has 8 sim slots. ACOM516-256 is able to process traditional voice call service and internet data service and adopt new hardware and software structure, which supports up to 16 concurrent calls.
Special Features:
 Support G729a/b/e,G723.1,G.711 A/U law, iLBC auto-selecting
 EBO(Ejoin Bandwidth Optimization)
 Proxy Encryption Solution for IP Block
 Support SIM Bank
 VPN(pptp)
 SIM Card Rotating(ACOM516-256)
 Solution to solve the SIM card blocked by:
 Accumulated Call Duration
 Accumulated Connected Calls
 Accumulated Calls
 Consecutive Failed Calls
 Consecutive No-Alert Calls
 Consecutive No-Answer Calls
 Consecutive No Carrier Calls
 Consecutive Short-Duration Calls
 Station intelligent switching
 ERMS(Ejoin Remote Management System)
 Port Inter-Calling
 Fake Ring-back
 Call Duration Limitation for SIM Card/Single
 Dial Plan/Prefix Inward Translation/Intelligent Routing
 Web Browser: Firefox/Chrome /IE/Opera




ACOM 516-256

Number of Channels

16 channels 256 sim slots


GSM: 850/900/1800/1900MHz

SIP Specification

SIP/2.0 RFC3261

Session Timer RFC4028


Network Protocols





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

Number of Ports

1 WAN 10/100Base-T Ethernet(RJ-45 connector)

1 Console(USB)



1 Power and 16 groups of card online and running status indicator

Power Supply

100-240V AC, 50 - 60 Hz IN, 12V/5A OUT

Operating Environment

Operating temperature: 0 - 50ºC

Operating humidity: 10 – 90%RH


12 Months

Mobile Features:
 SMS Send, Receive and Forward(GSM/SIP/HTTP)
 SMS Inbox
 AT Command , USSD
 SMS Format: PDU/TXT
 PIN Code Management
 CDMA Delay Answer
 GSM Polarity Reversal
 Carrier Selection
 Caller ID Hidden(need SIM Card support)
Maintenance and Management:
 Multi-language Interface
 USB Serial COM
 Configuration Backup and Restore
 Support HTTP/TFTP Upgrade
 Call statistics: ASR,ACD,PDD
 Ejoin Remote Management System

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