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How to connect to analog telephone lines

Due to the fact that SIP telephony is inevitably spreading, there is a huge demand for connecting old PSTN devices to the VoIP network. Ozeki Phone System XE VoIP PBX allows to connect analog phone lines and PSTN devices effectively. Follow this article for step-by-step configuration guides.

You can easily connect analog phone lines and PSTN (Public Switched Telephone Network) devices to Ozeki Phone System XE. For this purpose you will only need an ATA (Analog Telephone Adapter) device. The PBX will handle these lines and devices with the help of the connected ATA. This way, PSTN-to-VoIP and VoIP-to-PSTN calls can be made easily (Figure 1).


Figure 1 - Ozeki Phone System XE is connected to PSTN devices

Regarding PSTN-to-VoIP communication, address translation is the key factor. In a VoIP network, the connected computers and VoIP devices are differentiated by IP addresses. It means that an IP address is assigned to each device.

When you would like to call a PSTN phone number from a VoIP network, then the assigned IP address of the phone needs to be translated to a phone number. This phone number then can be easily recognized in the PSTN network.

The PSTN connection can be created in the PBX as an extension. It means that this connection will seem to be a SIP extension from the VoIP side, while the VoIP network will seem to be a traditional phone line from the PSTN line.

Step-by-step configuration guides

  1. How to connect to analog telephone lines
  2. How to connect analog telephone sets

1. How to connect to analog telephone lines

Please follow this step-by-step guide in order to connect Ozeki Phone System XE to analog telephone lines.

First of all, start Ozeki Phone System XE and log in with your username and password (Figure 2).


Figure 2 - Login

Click on Install next to PSTN device option in Outside lines section (Figure 3).


Figure 3 - Select PSTN Device

Now you need to enter the parameters for the installed PSTN device on the configuration form. Please provide the Connection name, Username, Authentication name, Password under the General configuration page. On the bottom of the tab, you need to give the IP address of your PSTN gateway (Figure 4).


Figure 4 - General settings

On the Calls subpage you can set which phone number will be shown on the receiver's phone and which prefix should be used to make a call toward the PSTN line (Figure 5).


Figure 5 - Caller ID and prefix

In addition, you need to set an Analog Telephone Adapter (ATA).. You need to connect it to the public switched telephone network and the local computer network. In order to connect the ATA with the Ozeki Phone System XE, find the PSTN line configuration page of the ATA, and set the follows (Figure 6):


Figure 6 - Linksys SPA3102 ATA

To receive calls from the traditional telephone network you need to add a new dial plan. Click on the Add rule button in the Dial plan section (Figure 7).


Figure 7 - Add rule

On the next page, under the Description tab you need to write a description for the new routing rule. (Figure 8).


Figure 8 - Dial plan description

Under the Source tab you need to select a Specific outside line which needs to be the created PSTN device (Figure 9).


Figure 9 - Source

And finally, on the Destination tab you can give which phone will be ringing in case of a call from the PSTN device (Figure 10).


Figure 10 - Destination

Now your Ozeki Phone System XE is ready to initiate calls to the PSTN network and receive calls from the PSTN network.

2. How to connect analog telephone sets

Please follow this step-by-step guide in order to configure an analog phone as an extension in Ozeki Phone System XE.

First of all, start Ozeki Phone System XE and log in with your username and password (Figure 11).


Figure 11 - Login

Click on Install next to SIP Extension option in Extensions section (Figure 12).


Figure 12 - Select SIP Extension option

Now you need to enter the parameters for the installed extension on the configuration form. Please provide the Extension phone number, Authentication name, Password and click on the OK button. In addition, note the IP address of your PBX (Figure 13).


Figure 13 - Configure SIP Extension

In order to use your analog phone, you need to have an Analog Telephone Adapter (ATA). After connecting the ATA to the phone and the computer network, open its configuration page. Click on the Voice and Line 1 buttons. And provide the following data (Figure 14):


Figure 14 - Linksys SPA3102 ATA

Now return to the Ozeki Phone System XE and click on the Log button. Figure 15 shows the registration of the desktop phone.


Figure 15 - Desktop phone registration

Keep in mind

Ozeki Phone System XE makes it possible to connect to PSTN lines and devices easily. This way, you can manage all corporate phone calls under one flexible platform. For this purpose, you only need to setup an ATA to connect VoIP PBX with PSTN devices.

For more information or assistance, please contact us at info@ozekiphone.com

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