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ZED-3
Profesyonel GSM Gateway Çözümü
Key Features
Modular gateway supporting analog, CDMA, and GSM
2G, 2.5G, and 3G compatible
Permits mixture of interfaces
Connects to VoIP PBXs and SIP networks with Ethernet
Operates as a gateway (with clustering) without IP PBX
Connects to PBXs, key telephone systems, analog phones, or analog phone lines
Up to four GSM or CDMA interfaces
Up to four analog FXS interfaces
Up to eight analog FXO interfaces
Up to eight channels of voice
Send and receive voice calls between any interfaces
Passes caller ID for incoming calls
Send and receive SMS
Captures log of calls and statistics
Simple configuration with web browser
Multiple languages and worldwide support
Benefits
Connects directly to IP or analog PBX to simplify wiring
Connects to traditional phone systems with analog circuits
Compatible with open standards SIP networks
Connect to wireless and land line phone networks
Free calls to phone network (depending on plan)
Easy expansion of phone lines
Extend PBX extension seamlessly to your mobile phone
Setup an office without needing land lines
Mobile phones become extensions of business PBX
Useful for businesses from SOHO to branch office to enterprise
Other Resources
Click the images below for more information about the industry recognition for this product.
 
Scroll down to see some applications for the GS8 modular gateway. Also click here for specific application notes.
Zed-3 offers the GTXT software to send and receive SMS on the GS8 modular gateway. Click here for information on this product.
Description
The Zed-3 GS8 modular gateway is a stand alone gateway for VoIP, PSTN, and mobile phone networks. It converts the format of a phone call to allow it to pass among these networks. The device connects to the PSTN using analog, the mobile network using GSM or CDMA, and the IP network using SIP.
With this device you obtain great flexibility in how calls should be routed and have a means to provide telephony backup in the event the standard telephony path fails. Further, you can significantly reduce the money you spend on telephony, especially for the cost of calls from your internal phone system to CDMA or GSM phones.
The GS8 modular gateway is compatible with most IP PBXs using the SIP protocol, is compatible with traditional (legacy) phone systems with analog circuits, and can be used separately or in a cluster without any PBX. It provides a means to easily integrate mobile telephony as part of your company’s phone system.
Hardware and Telephony
The GS8 modular gateway can be mounted in a 19” rack and has four slots into which you can plug any interface module. The GSM, CDMA, and FXS modules have one port (or circuit) each; the FXO module has two ports (circuits).
The FXS port can connect to analog telephones or to a PBX (in which case, it appears as the telephone exchange). The FXO port connects as a subscriber to your PBX or to the telephone exchange.
If you have a single wireless module, you may be able to connect a small antenna directly to the module. However, for better reception, you may want to use an external antenna, connected with coaxial cable to the module. If you have multiple modules, you should use the antenna splitter (combiner) and then use a single external antenna.
SIP Operation
There are two working modes in which the GS8 modular gateway connects with other SIP devices, including interconnection with other GS8 modular gateways.
The basic working mode is similar to that of a SIP phone in which the GS8 modular gateway registers to another SIP device, such as a soft switch or IP PBX.
The second working mode is to connect to other SIP devices without registration. This permits the GS8 modular gateway to operate independently of an IP PBX and also permits the clustering of GS8 modular gateways to transparently create a virtual gateway that has more than four wireless ports.
SMS
The GSM and CDMA modules can send and receive SMS text messages to or from a mobile phone. These are transmitted over the Ethernet port as SIP MESSAGE messages to ensure compatibility with a variety of different SIP PBXs. You determine for each module the destination of received SMS messages and you can program that SMS are always sent to a person who sent an SMS to that phone number within a specified time.
The GS8 modular gateway can send and receive text messages in 7 bit mode (160 characters per message) or in Unicode (70 characters per message). It can send and receive multimedia messages comprising images and rich text that are limited to 30 KB.
Zed-3 offers the GTXT software to send and receive SMS on the GS8 modular gateway. Click here for information on this product.
IVR (Interactive Voice Response)
The GS8 modular gateway has an IVR function that can prompt callers. This can be enabled or disabled separately for the IP, FXO, GSM, and CDMA ports.
When enabled, it provides authentication and two stage dialling. A call is answered by the GS8 modular gateway which then prompts the caller to enter a password, a number, or both, depending on your criteria. When calls are received on the specific interface, the GS8 modular gateway will verify the password (if programmed), and collect the destination phone number. The call is then routed according to the routing table in the same way it would be if the IVR was not enabled on that port.
System Administration
The GS8 modular gateway has an HTML based administration UI so that it is not necessary to install any management software on a PC. The administration UI is intuitive and easy to navigate. You can access and manage the GS8 modular gateway from anywhere as long as you have a web browser and access to the Internet.
The administration UI provides various real time information and statistics of the GS8 modular gateway. These include operation state, system and network information, events and alarms, line status, and comprehensive call detail records (CDRs).
Data Networking
Most IP networks existing today support VLAN and QoS and using these features can increase the voice quality of phone calls. The GS8 modular gateway fully supports IEEE 802.1Q VLAN tagging and IEEE 802.1p QoS. At the IP layer, the GS8 modular gateway supports the ability to mark the lower six bits of the IP QoS byte with the various differentiated service code point (DSCP) markings.
Diagnostics and SNMP
The system chassis has two LEDs on the front to indicate the status and two LEDs on the Ethernet port. The wireless modules have two LEDs to indicate status and the analog modules have a single LED per port to indicate when a call is in progress.
The system provides ping, traceroute, and DNS lookup for network diagnostics. These tools will help you identify most networking problems. To identify call setup problems, the system also provides a SIP Route Trace diagnostic tool.
The GS8 modular gateway supports Trap in SNMP. This allows you to be notified immediately if the system is experiencing any problems.
Global Features
Zed-3 sells and supports its products worldwide. The GS8 modular gateway supports telephony protocols for many countries so it can connect directly to the local PSTN. Different modules are available for the GSM frequencies of 850 MHz and 1900 MHz (USA and most of the Americas) or 900 MHz and 1800 MHz (most of the rest of the world). The CDMA module operates at 800 MHz, serving most parts of the world. You can navigate the GS8 modular gateway’s administration UI in English or Simplified Chinese.
Application: Basic Use
Equipped with GSM and CDMA modules, the GS8 can connect your office phone system directly to the mobile phone network. Depending on the calling plan you have with your carrier, this could mean that calls to the PSTN or other mobile phones cost nothing for each call.
The configuration shown in the figure permits the office to make and receive calls over the mobile network instead of over the PSTN land line.
Some carriers offer free calls among a group of users. By putting one of the SIM cards in the GS8, calls between your remote users and the office will be free. Similarly, some mobile phone carriers have very low cost rates for international calls compared to an equivalent call on a land line. By routing all international traffic over the GSM or CDMA network, your company may have significant savings.
The business can also choose to publish the mobile phone number associated with the ports on the GS8 modular gateway. Callers using a mobile phone may be able to call the company’s “mobile” number cheaper than if they called the company’s land line phone number. This will lead to increased business and customer satisfaction.
Application: One Number for Executives
As an extension of the previous application, you can use call forwarding on the PBX to automatically route inbound calls to your mobile phone. Depending on the PBX, you may be able to do this selectively, based on the time of day, day of week, or caller.
Then when the executive is not in the office he or she can still receive calls directed to the office phone. This is achieved without having to disclose the executive’s mobile phone number to the caller. The call is forwarded to the mobile phone automatically, with minimal delay, and at no additional cost to the caller or the business (depending on the calling plan).
Application: Extension to Other Offices
If you have branch offices, you can extend the calling from those offices to be transmitted over one GS8 modular gateway, so you don’t need to have multiple gateways in each office.
The configuration shown in the figure permits the remote office to use the gateway at the main office thereby reducing communications costs in that office, too.
Application: Use for Backup Communications
If you are using an IP PBX as the communications, and that PBX is connected directly to an ITSP (internet telephony service provider), you can use the GS8 modular gateway to provide backup telephony in the event the internet service fails.
The configuration shown in the figure shows an office making and receiving its normal telephony with the ITSP. If that service fails, calls can be routed through the GS8 modular gateway to the PSTN or mobile networks.
Alternatively, calls may be routed to the GS8 modular gateway using a least cost routing (LCR) algorithm in your PBX. This LCR determines whether a call should be routed over the ITSP, the analog PSTN network, or over the GSM or CDMA network. The LCR is programmed to compare part or all of a dialled number against a list in a routing table and can, for example, cause calls to a mobile phone to be made from CDMA or GSM to mobile instead of land line to mobile.
Application: Connection to Traditional PBX
The GS8 modular gateway can connect to a traditional PBX to provide flexibility and low cost telephony calls. It can connect with the FXS or FXO modules.
In the configuration shown in the figure, the GS8 modular gateway is connected to standard analog ports on the PBX with an FXO module. The GSM or CDMA module or modules are mapped to these analog circuits. The GS8 modular gateway appears to the PBX as subscriber extensions. A call to the analog extension on the PBX will be routed automatically to a mobile phone. This seamlessly provides a mobile phone user with a wireless extension on the PBX.
You can choose whether incoming calls are private or public. A private call would be treated just like any extension call. The system can authenticate the caller and either permit calls from only a specified mobile phone or prompt the caller for a password. A public call would be treated just like a call from the PSTN and always be routed to the operator or automated attendant.
In the configuration shown in the figure, the GS8 modular gateway is connected to standard analog ports on the PBX with an FXS module. The GSM or CDMA module or modules are mapped to these analog circuits. The GS8 modular gateway appears like the PSTN (or central office) to the PBX. Outgoing and incoming calls to the mobile phone network can be treated identically to those to or from the PSTN.
You can use LCR on the PBX to determine if a call from the PBX should be routed to the GSM or CDMA network, or to the PSTN network. Again, call forwarding configured on the PBX can permit calls to a user to be automatically routed to a mobile phone.
Application: Reduction of Multiple Mobile Phones
In many parts of the world, there is fierce competition among the authorized mobile phone operators. They may charge little or nothing for calls to other phone numbers in their network and charge much for calls to phones on a competing network. This may force an executive to carry multiple mobile phones and publish multiple mobile phone numbers on his or her business card. Using the GS8 modular gateway as shown in figure the executive now needs to carry only a single mobile phone.
The figure shows a GS8 modular gateway with four GSM or CDMA modules. The modules are registered with service providers ‘A’ to ‘D.’ The executive used to carry four mobile phones and now carries a single mobile phone, in this case the one registered with provider ‘A.’
When a call is received on provider B’s network, the PBX routes it to the executive’s extension. The executive has a simple call forwarding rule to redirect all calls to the mobile phone (on provider A’s network). This will probably be at zero cost and is transparent to the caller.
The GS8 modular gateway can operate in this mode completely stand alone, without any IP connection. It can be programmed to route any call received on any one of its ports to any other port. As the next example shows, it can operate this way in a cluster so this application can be extended to five or more mobile phone service providers. The scheme shown in figure has the advantage that when the executive is in the office he or she can stop the call forwarding and receive all calls on his or her desk phone.
Application: Clustering of GS8 Modular Gateways without an IP PBX
Figure shows how multiple GS8 modular gateways can be connected together to create a virtual GS8 modular gateway with increased capacity. A SIP call can be routed from one GS8 modular gateway to another GS8 modular gateway. The receiving GS8 modular gateway simply accepts the call and routes it based on the programmed routing strategy.
In this example an incoming call from the traditional PBX can go out to the GSM or CDMA network from any free GSM or CDMA port, and this GSM or CDMA module does not have to be in the same chassis as the analog module.
It is theoretically possible to extend this cluster of GS8 modular gateways without the limitation of location and number of nodes.
Application: Service Business using SMS
This shows how a business can improve customer satisfaction by sending (and receiving) SMS text messages to customers. Figure shows a company that has a data base with details about the service provided to the customer and a small piece of middleware software that interfaces to the data base and communicates with the GS8 modular gateway either directly or through the IP PBX.
On a changing customer situation in the data base, the middleware can cause an SMS to be sent to the customer. It can receive a response from the customer and cause another action in the data base. This will all happen without anyone needing to initiate the transaction or gather any response.
One example might be a car repair garage. After a customer’s car has been repaired or serviced, the data base is updated with the details of the service. The system can send an SMS to the customer to inform him or her that the car is ready and the total bill.
Another example might be a dental or optician office that schedules regular appointments with clients every six months or so. Usually, the practitioner will call the client prior to the appointment to ensure he or she has not forgotten and will confirm the appointment. Instead, the middleware is programmed to send a reminder by SMS a few days in advance and request that the client acknowledge attendance by replying “yes” or “no.” A further reminder can be sent 12 hours before the appointment if required.
A third application is where a restaurant accepts reservations for booking a table. When the reservation is accepted the caller’s mobile number is entered into the data base. The system sends an SMS to the caller with the address of the restaurant and a confirmation of the booking date and time. If the booking was made long in advance, the system can request confirmation of the appointment with an additional text message a few hours before the meal.
Each of these examples is less intrusive to the client, requires no intervention in the office, and improves customer satisfaction.
More Applications
We have written application notes that are specific for the GS8 modular gateway. Click here to see a list of them.
Specifications
Capacity
4 GSM ports (850 & 1900 MHz or 900 & 1800 MHz)
4 CDMA ports (800 MHz)
4 FXS ports (loop start)
8 FXO ports (loop start)
Any mixture of interfaces is permitted
8 channels active simultaneously
Telephony and Messaging
A-law and μ-law G.711, G.729A, G.723.1, GSM
Automatic negotiation of code
Route audio between any interface
Echo cancellation
Fax support for Group III up to 9.6 kb/s with T.38
Call progress tones for multiple regions
Caller ID screening
Call routing for received and transmitted calls without external PBX
ASCII and Unicode characters for SMS messages
VoIP and IP Networks
SIP user agent and B2BUA (RFC3261 compliant endpoint)
Operates with and without SIP registration
Simultaneous registration to multiple proxies
Dynamic jitter buffering
Packet loss compensation
Adaptive VAD with CNG
IP TOS, 802.1p/Q VLAN tagging, and DiffServ
DTMF signalling in band, RFC2833, or with SIP Info
NTP
Configuration and Management
HTTP interface (uses web browser)
English and Chinese languages for administration
Online upgrade with HTTP
Configuration backup and restore
Least cost routing
RADIUS client
Diagnostic tools: ping, tracer, DNS lookup, SIP route trace
Comprehensive alarm and event records
Access control list (ACL)
SNMP trap
Hardware Specifications
LED indicators on chassis and modules
SMA connector on GSM and CDMA modules
RJ11 connector(s) on analog modules
Each GSM and CDMA module accommodates one SIM card
Reset button
One 10/100 Mb/s LAN port
Power
External ac to dc power adapter
Input: 100~240 Vac @ 47~63 Hz
Power: 20 W
Physical and Environmental
Operating temperature: 10°C to 40°C (50°F to 104°F)
Storage temperature: 0°C to 50°C (32°F to 122°F)
Weight: 2.6 kg (5.7 lb). Shipping weight 3.9 kg (8.6 lb)
Size: 440 mm (W) x 225 mm (D) x 45 mm (H) (17.3” x 8.9” x 1.8”)
Safety: FCC Part 68
EMI: FCC Part 15A
RoHS: Compliant
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