Overview


The GXW series offers a cost-effective, easy to deploy VoIP FXO/FXS analog gateways. The GXW4108 is an analog gateway equipped with 8 FXO ports. Each of those eight ports can take the signal of an analog fixed line. Actually Grandstream offers even more. The GXW4108 is equipped with two Ethernet (RJ-45) ports so you will be able to use the device as switch. According to Grandstream the device is T.38 compliant, so you will be able to send and receive faxes through it. It supports various Audio Codecs as G711, G723, G729 and GSM. The firmware can be updated by TFTP or HTTP so you will be able to update it whenever you want. The device has even a video surveillance capabilities (a video input port).



The GXW4108 supports multiple SIP accounts, associated with physical line ports, each account corresponding to one of the multiple SIP profile. The device also supports multiple SIP profiles, max of 3 profiles per system. Each profile hosts 0 to multiple number of SIP accounts, depending on user need. Dialing through GXW4108 is divided into One stage and Two stage dialing:

Initialization

The first thing that you should do is to setup the network configuration. By default the GXW4108 has configured static IP address 192.168.0.160 with network mask 255.255.255.0 So in order to access the device you should be directly connected to it (no routing) and to have an IP address in the network 192.168.0.x

The device configuration interface is located on http://192.169.0.160 Start your web browser and type in the address. You will see the authorization form. The only thing that you can input is the administration password. The default password is `admin`. Type it in and click on the Login button. Once you logged in you will be able to configure the device by using the five configuration pages:

For clarity of this documentation I will divide it into few sections:

Network Configuration

In order to reconfigure your network configuration you should have a network access to the device. It's default settings are as following:Which means that you should assign a temporary dummy address in the network 192.168.0.x in order to access the device. All the configuration is been made through the web interface which is located on http://192.168.0.160. The default password is `admin`. Access the page and click on the Basic Settings tab.

From this page you will be able to reconfigure you network settings. There are two ways to configure your network settings

Static Network Settings

You should edit the network configuration by using this form:

When you fill your new network settings click on the `Update` button. The device will save the new settings and will reboot. Note that the device won't be accessible from 192.168.0.160. You should restore your network settings and try to access the device from its new IP address. In our case it is: 10.2.5.126

Dynamic Network Settings

The device can set acquire network settings from your DHCP server or through PPPoE.

Setting accounts and extensions

GXW4108 supports up to three separate server profiles. That's why we are going to set accounts and extensions on two different servers. The first server will have an IP address 10.1.1.1 and the second 10.2.2.2. Grandstream's device works with SIP so we will create SIP accounts on our servers.

We'll create an additional IAX account for the Idefisk softphone which we will use for tests.

We will also add extensions that will dial IAX/idefisk-x on each server.


The rest of the extensions will be create later, when we describe the one and two stage dialing.

Remember to reload your Asterisk configuration before continuing with the configuration of GXW4108. We have changed sip.conf, iax.conf and extensions.conf so we will reload the entire Asterisk configuration. We will achieve this by using the command

Configuring Server Profiles

In order to set GXW4108 SIP account we will have to configure the server "connection" settings. In order to achieve that we'll have to set up the Server Profiles. Click on `Profile 1` on the tabs. From this page you will be able to configure the connection settings.
• For 10.1.1.1 which has domain name myasterisk.server.net
• For 10.2.2.2 which has no domain name

Configuring Channels

We are ready to configure the channels. In order to that click on the `Channels` tab on the menu. You should fill the form in the beginning of the page. Here is a screenshot of the form filled with our sample accounts.

Remember ti set the appropriate Profile in the drop down menu. GXW4108 will try to register with the Auth ID and Auth Password on the targeted Profile. Note that you should specify to which channels this configuration is applied. When you are ready with this click on the `Update` button. The device will reboot and load the new settings.

Once the device boots properly we will check if it has registered itself properly on the two Asterisk servers. To do this we will use the command:





Dialing Configuration

When it comes to dialing GXW4108 supports two modes. The first one is called One Stage Dialing, and the second one is Two Stage Dialing. For simplicity we will describe two methods separately. We will begin with the Two Stage Dialing because it is more simple.

Two Stage Dialing
In order to use Two Stage Dialing for certain channel you should set it into the `FXO lines` configuration page. We will set channels 1 and 2 to One Stage Dialing, channel 3 to Two Stage Dialing, channels 4 to 6 to One Stage Dialing and channels 7 and 8 to Two Stage Dialing. This refers to setting:


Two Stage Dialing means that when you dial the GXW4108 from your Asterisk server (by executing Dial(SIP/103) for example) the GXW4108 will Answer your call from and you will hear the PSTN's dialing tone. You will be able to dial any number, just like you are on fixed line. If you dial from the PSTN to your fixed line which is attached on channel 3 the GXW4108 will Answer your call and will give you the Asterisk dial tone. You will be able to dial any extension that is in the `incoming ` context.

One stage dialing

In order to use Two Stage Dialing for certain channel you should set it into the `FXO lines` configuration page. We will set channels 1 and 2 to One Stage Dialing, channel 3 to Two Stage Dialing, channels 4 to 6 to One Stage Dialing and channels 7 and 8 to Two Stage Dialing. This refers to setting:
The FXO interface currently does not support Direct Inward Dialing (DID). The GXW4108 implements an off-hook autodial feature for each physical port (FXO channel). That's why we will have to configure the Off-Hook setting for those channels which are under One Stage Dialing. If someone calls the fixed line which is connected to channel 1 we will dial 0101 extension on our Asterisk server.

		ch	server		extension
		1	10.1.1.1	 0101
		2	10.1.1.1	 0102
		4	10.2.2.2	0204
		5	10.2.2.2	0205
		6	10.2.2.2	0206

This will result into the following setting for Off-Hook Autodial setting:


We'll have to configure those extensions on the respective Asterisk servers. We'll show it only for 10.1.1.1 . One of the extensions will dial our test IAX account and the other one will be an echo test.

	[incoming]
	exten => 0101,1,Dial(IAX/gtest,20)
	exten => 0101,2,HangUp()

	exten => 0102,1,Answer()
	exten => 0102,2,Echo()
	exten => 0102,3,HangUp()

Reload your dialplan configuration by using:Now if you dial your fixed line number connected on channel 2 the GXW4108 will transfer you automatically to extension 0102 - the echo test. If you dial your fixed line number connected on channel 1 the GXW4108 will transfer you automatically to extension 0101 - it will dial IAX/gtest.
Dialing out from our Asterisk server can be performed as if the SIP account was trunk. Here is an example:This extension will dial number 35928118118 through the fixed line attached on channel 1. You can always use some matching in order to dial more numbers

Firmware Update

It is good to have your devices always updated to the latest available firmware. GXW4108 supports firmware update from a HTTP or TFTP server. It also supports automatic update based on time. The first thing you should do is to go to the Grandstream official web site and download the latest patch. The file that you should download should be named Release_GXW4104_GXW4108_1.x.y.z.zip where x,y and z are the version of the firmware. In this tutorial we will describe only the TFTP method. First you should install a TFTP server. You can achieve this by executing those commands: Once you install this server go to /tftpboot/ directory. If it does not exist create it. Unpack the archive into this directory. Then go to the configuration interface of the GXW4108. Go to `Advanced Options` tab. Fill up the IP address of the TFTP server. Select TFTP as method for update. Then update and reboot the device. Once it boots up it will try to connect to your TFTP server and download the files.


Here is a link to the current latest firmware: Release_GXW4104_GXW4108_1.0.0.41.zip

Links

Here is the list of the resources that we have used for configuration and testing:

We have gathered some usefull links: