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8 Ports GSM VOIP SK Gateway for Call Origination and Termination In GSM

8 Ports GSM VOIP SK Gateway For Call Origination and Termination in GSM


SK 8-8 8-32 products introduction:

Why choose SK gateway ?

A lot of clients now are complaining about the blocking issues. First, you may know why the Operator blocks you frequently? Second, what are the rules for the blocking? Third, how can we reduce it, even avoid it? There are some rules I have found out for you. 

#Operator detects you SIM cards are abnormal. The explain is because the Operator affirms your SIM cards are not being used by a human, instead some certain devices.

Solution: On one hand, the SK gateways are designed with a function which copies a human’s behavior of using a SIM card and makes it look like a human is using it. On the other hand, the SK gateways also can copy a human’s behavior of sending SMS and making calls among the ports. All the functions can be set by the setting page of the SK gateways. 

#Operator detects the calls of its continuous minute. Once the SIM cards reach a certain continuous minute, SIM cards block.

Solution: Our SK smart gateways can be inserted 4 SIM cards each port and support the SIM cards making calls circularly itself. For this advantage, you can set when 1 SIM card reaches a certain continuous minute, then goes to next SIM card to make calls. Also, we can set it sending SMS more frequently to reduce the blocking.

#Operator detects if your SIM cards are making call according to the same base stations.

Solution: Normally, when people are making calls, our phones are searching for the best signal from the base stations and they will not always use the same base stations; they will move and change different base stations. According to this Operator’s blocking rules, our SK gateways can change different base stations to make calls, even if you’re making calls.

#Operator detects the IMEI No. of SIM cards and blocks it.

Solution: Our SK gateways can be set to change IMEI No. Automatically to avoid blocking issues.

SK8-8 and SK8-32 support 8 calls at one time,which is different in the number of SIM cards it can insert. SK8-8 can insert 8 SIMs while SK8-32 can insert 32 SIMs at most,means 4 SIMs in one channel.pls check as follow pic:

8 ports with 8 SIMs GSM VOIP Gateway:

8 ports with 32 SIMs GSM VOIP Gateway:

Special Features:


SK8-8 / SK8-32

Number of Channels

8 channels


GSM: 850/900/1800/1900MHz



4G :
     FDD LTE: B1/B3/B5/B7/B8/B20
     UMTS: B1/B5/B8
     GSM: 850/900/1800/1900MHz
     FDD LTE: B2/B4/B5/B12/B17
     UMTS: B2/B4/B5
     GSM: 850/1900MHz
     FDD LTE: B1/B3/B8
     TDD LTE: B38/B39/B40/B41
     TDSCDMA: B34/B39
     UMTS: B1/B8
     GSM: 900/1800MHz

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 LAN 10/100Base-T ethernet(RJ-45 connector)

1 Console(USB)


1 Power and 8 groups of card online and running status indicator

Power Supply

100-240VAC, 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

 Remote Management System 

Company Introduction:

China SKYLINE Telecom  Co., Ltd. was founded in 2002, and we have 120 employees and more than 10 production lines. More than 100 companies have established business relationships with us, and they are from 30 different countries. 

Our company is a manufacturer of 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.

Skyline Telecom is one of the leading suppliers of 8 ports gsm voip sk gateway for call origination and termination in gsm which is widely used in communication industries and many other industries. Mainly focused on Asia and Africa, we will try our best to offer our quality products to Pakistan, Bangladesh, India, UAE, etc. Under strict quality control and management system, you can rest assured to buy.


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