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Gateway grandstream: Hybrid telephony solution

There is still doubt whether having an IP PBX in place or a cloud-based PBX, which is the best choice? Features, performance and costs will be the key when selecting our option, always thinking about the needs of the company.


Brief history of Grandstream Networks


Grandstream Networks was founded in 2002 in the United States with the objective of becoming the leading manufacturer of voice/video telephony/video surveillance systems in Internet protocols.

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The products are based on standard SIP protocol, offering the broadest interoperability in the industry.

Corporate Structure

This privately owned company has more than 400 employees worldwide.

Its Corporate mission is to become the provider of system innovations in voice/video/video communication/IP surveillance for SMBs and consumers worldwide.



Types of switchboards and their functions

In the business communications market, three types of switchboards stand out: analogue, digital and IP PBX’s.

Analogue switchboard:



They are based on analog technology, calls are switched and redirected to the recipient through the electronics of this switchboard (small switches). Phones are usually simpler and connect with an RJ9 connector (two wires).

They use basic lines (RTB) for outdoor connection. Its price is cheaper with rather limited functionality, require outside physical line for each call.

Digital switchboard:

At present, most PBXs are of this type (digital). In a technical way it can be said that they are similar to a server (computer), the calls are managed transforming them to data (1 and 0s).

A switchboard has the ability to support several types of input lines (ISDN, RTB, GSM, fax, modem, among others).

The terminals to be connected must be digital (they are connected through an RJ11 or RJ 45 cable). They merit as well as analogical switchboard to have the wiring in the office.

IP switchboard:

IP PBXs are the most advanced and modern solution available. They are very similar to digital switchboards (they manage data with 1 and 0) their standard is IP communication (just like Internet data).

Thus, sharing office Internet networks (Ethernet) as well as external networks that connect everyone.

This system allows sharing Internet networks, including computers, through any Ethernet connection.




Why choose an IP PBX?


When we talk about the reasons for choosing an on-site PBX we are not going to have any other answer than control.


Who doesn’t like to have control?


Advantages of Gateway Grandstream


There are a number of advantages when we decide to have an IP PBX, among which stand out:


  • Long-term money savings, lower recurring rates with many more features and customization capabilities.
  • Features, resources and integrations are leveraged.
  • Redundant and high availability solution (important if your company provides continuous service).
  • Guaranteed security: manages, monitors and controls the security of the system.
  • Great integration capacity with CRMs, PMSs and call centers.


Comparison of the best Gateway Grandstream options


Below is a comparison table with the best options for an IP PBX available on the market.


FXO Ports4 analog lines8 analogue lines16 telephone ports (RJ11) 50-pin Telco connector24 telephone ports (RJ11) 50-pin Telco connector2 Telco 50-pin connectors
Surveillance PortAnalogYes1 Gigabit Ethernet.1 Gigabit Ethernet.1 Gigabit Ethernet.
Electricity supplyExternalExternalAdvancedAdvancedAdvanced
RJ-45 PortsTwo portsTwo portsOne PortOne PortOne Port
SIP AccountsThree accountsThree accounts2 SIP profiles, 1 account per port2 SIP profiles, 1 account per port4 SIP profiles, 1 account per port
Caller IDYesYesYesYesYes
Firmware UpdateBy TFTP and HTTPBy TFTP and HTTPBy TFTP and HTTPBy TFTP and HTTPBy TFTP and HTTP
Dialing StagesTwoTwoTwoTwoTwo
Port Video InYesYesYesYesYes
Other specificationsResponse to small businesses with branches or remote offices.

With web connection can be

Response to small businesses with branches or remote offices.

With web connection can be used as video surveillance

New generation of high density compatible with SIP standard.

Advanced security by AES encryption

New generation of high density compatible with SIP standard.

Advanced security by AES encryption

New generation of high density compatible with SIP standard.

Advanced security by AES encryption


Why implement hybrid VoIP solutions?

There are many reasons to go from a traditional telephony (analog) to a digital (SIP, VoIP), we name below only three by which you should implement in your business.


  1. Investment


Tight budgets can make it difficult to make a complete infrastructure change when it comes to changing telephony altogether.

A granstream gateway can simultaneously connect analog phones and IP PBXs to deliver the benefits of SIP technology.



  1. Lack of availability


In some geographic regions the bandwidth is reduced, preventing to obtain a SIP connection to migrate completely to digital telephony.

With grandstream gateway you can build a 100% IP network internally and connect it to analog trunks.



  1. Massive deployments of analog telephony.


Many residential phones are based on analog technology and refuse to switch to digital technology.

Creating a smooth transition to allow users to continue using analog devices will be the best way to address this problem.



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Gateway Grandstream: Analog adapters for Internet protocols

Telephone infrastructures have allowed communication for years, now all systems have been changed to digital, using Gateway grandstream can adapt analog phones to receive VoIP calls.

What is an analog adapter?

The Analog Telephone Adaptor (ATA) is a device capable of converting the signals used for analog communications into the Internet Protocol (VoIP).

Generally these adapters are used to convert the digital signal (own or IP) in the analog signal, so you can connect to traditional phones (analog) or facsimile (also work transforming the digital signal to analog).


Why are they called Gateway?

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Analog phone adapters can be described as Gateway because their operation is precisely the connection between both worlds (analog and IP).

However, we must be clear that a Gateway is described as a multi-port telephone adapter, which is almost always accompanied by more complex routing functions.


Disadvantages of ATAs

The main disadvantage of using these ATA devices is that you cannot enjoy all the benefits of IP telephony.

Differences between analog and digital (IP) phones

Before we continue talking about Gateway grandstream, ATA and digital telephony we will proceed to explain what is analog telephony and digital telephony.

Analogue telephony


An analog telephony is one that uses “waveform signals”.

It may be the best known type of signal, and undoubtedly the oldest. Remembering that the signalling between a telephone exchange and a telephone is the ability to receive and send information, among which stand out:


  • The start of the conversation is requested.
  • Select who to talk to
  • There is progress in the call (ring, busy ring)
  • If you initiate a new call

Brief history of analog telephony.

In the beginning the telephones used only a copper wire, so in this way, the audio was sent as signaling while the return was done by land.

As the number of telephones increased, it was necessary to increase them to a second wire per telephone (to avoid interference).

Characteristics of analog telephony.

Analogue telephony has the following characteristics:


  • Only one communication per contracted line.
  • More suitable for residential market
  • Numerical identifier (DDI) on each line.

Digital Phones

In the early 1980s, the foundations were laid for new telephone networks, where digital terminals were offered to customers.

The idea of digitally covering telephony merits the implementation of a digital signalling protocol between the device and the telephone exchange.

The ISDN protocol was designed, which consists of establishing a data channel between the telephone exchange and the device in order to be able to exchange messages.

The signal protocols used are generally “proprietary” by each of the manufacturers, only a few use the standard protocol ISDN.

Characteristics of digital telephones.

Among the most salient features are the following:



  • ISDN lines (BRI) allow 2 simultaneous calls using 2 channels of 64 Kbps (voice and data).
  • Adapts to a central for a single DDI (for outgoing calls).
  • ISDN lines (PRI) up to 30 simultaneous calls using 30 64 Kbps channels (for voice and data)
  • Its target is the business market.
  • The sound quality is better than analog (no noise or interference).

IP Phones


After the standardization of digital telephones, it evolved into telephones with the capacity to transport multimedia data through data networks.

IP phones have the ability to digitize the voice in the terminal itself, to pack and send data using the network (must use IP protocols).

The advantage of these terminals is that they can be “virtual” using applications. At the corporate level they usually use SIP protocols, in many cases using Gateway grandstream to carry out this task.

Features IP Phones.

IP phones have the following features:



  • No dependence on physical lines, rather merits a network infrastructure, no limitation on simultaneous calls
  • Telephone numbers hosted in the cloud of our telecommunications service provider. There are no limits when it comes to contracting telephone numbers, as well as geographical location we want to choose (there are regulations to be respected).
  • By not relying on physical lines you can create a network with a large number of locations.
  • Allows the interconnection between networks of stores, or delegations so that they are connected using a single header number.
  • Allows the interconnection between networks of stores, or delegations so that they are connected using a single header number.

Grandstream VoIP Gateway

Grandstream’s VoIP Gateways will act in several ways, the most important of which are the following: Gateway to other networks, as well as a platform to unify analog and digital communications.

Analog adapters enable the integration of analog devices into the VoIP PBX.

Features of Gateway grandstream.

Here are some of the features of the grandstream gateway

Analog adapters are robust.

No need for a server

Different SIP, ISDN or analog interfaces

Low energy consumption

Enables integration with analog devices

What does Grandstream offer?

Grandstream’s Gateways are ideal for any company that needs the incorporation of IP technology.

It is also ideal for taking advantage of investments made in traditional equipment (analog telephony, faxes and PBX systems).

Gateway Grandstream Recommendations

There is a wide variety of products and series available from Gateway grandstream that can be better adapted to your needs, we explain in a general way:

Models GXW4104/4108

These grandstream Gateway devices have the ability to convert IP calls into traditional calls.

The GXW 4104 offers 4 ports while the 4108 offers 8 FXO ports, both are installed the same way. These grandstream gateways offer the most complete interoperability with IP PBXs, IP servers and softswitches.

Models GXW4216/GXW4224/GXW4248

Gateway grandstream models have from 16 to 48 analog ports (FXS). In addition, these Gateway devices come with advanced security protection, unsurpassed voice quality, easy to configure, and excellent performance with high call volumes.