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System Requirements
Following are manual configuration and setup instructions (for use with Thaitel Account) for use of the Linksys RT31P2-NA Broadband Router with 2 Phone ports. The RT31P2 must indicate as having No Affiliation with a VoIP carrier by having the -NA designation trailing the model number.
After purchasing IP-Phone account from Thaitel.com, you would get Thaitel PLUS account & password, which account will have format like 0029xxxxxx
High Speed Internet, such as ADSL or DSL Internet connection
Telephone & telephone line
Broadband Phone (Linksys RT31P2)
How to config IP Phone
Guide to install IP Phone
Configuring Thaitel Account through a Web Browser
Quality of Service
How to make a call
Guide to install IP Phone
The Back Panel:
The Router's ports and the Reset button are located on the back panel of the Router.
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Internet, This Internet port connects to your cable or DSL modem.
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Phone1, For your primary telephone line, the Phone1 port allows you to connect the Router to your telephone (or fax machine). Phone2 If you have a second telephone line, the Phone2 port allows you to connect the Router to your second telephone (or fax machine).
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Ethernet 1-3, These three Ethernet ports connect to the network devices, such as PCs or more switches.
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Reset Button, There are two ways to reset the Router's factory defaults. Either press the Reset Button,for five seconds, or restore the defaults from the Router's Web-based Utility.
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Power, The Power port is where you will connect the power adapter.
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The Front Panel
The Router's LEDs, which inform you about network activities, are located on the front panel.
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Power, Green. The Power LED light up when the Router is powered on. If the LED is flashing, the Router is booting up, running a system self-test, or upgrading its firmware.
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Ethernet 1-3, Green. The Ethernet LED serves two purposes. If the LED is solidly lit, the Router is connected to a device through the corresponding port (Ethernet 1, 2, or 3). If the LED is flashing, the Router is sending or receiving data over that port.
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Phone 1-2, Green. The Phone LED is solidly lit when a telephone or fax machine has a registered connection through the corresponding port (Phone1 or Phone 2). (The connection is registered if your Thaitel service account is active.) This LED is not lit when there is no registered connection. It flashes when the phone is being used or an incoming call has been detected.
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Internet, Green. The Internet LED lights up when the Router is connected to your cable or DSL modem. IF the LED is flashing, the Router is sending or receiving data over the Internet port.
Connection Instructions |
- Before you begin, make sure that all of your hardware is powered off, including the Router, PCs, switches, and cable or DSL modem
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- Connect one end of an Ethernet network cable to one of the numbered ports on the back of the Router. Connect the other end to an Ethernet port on a network device, e.g., a PC, print server, or switch. Repeat this step to connect more PCs or other network devices to the Router.
- If necessary, disconnect the telephone cable of your telephone from the telephone wall jack. Then connect that end to the Router PHONE 1 port.
Note: Make sure your telephone is set to its tone setting (no pulse)
- If you have a second phone line or fax line, repeat step 3 to connect a telephone or fax machine to the Router PHONE 2 port.
- Connect your cable or DSL modem Ethernet cable to the Router Internet port
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- Power on the cable, ADSL or DSL modem.
- Connect the included power adapter to the Router Power port, and then plug the power adapter into an electrical outlet. The Power LED on the front panel will light up when the adapter is connected properly.
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Configuring Thaitel Account through a Web Browser
1. Firstly, connect one end of an Ethernet network cable to one of the numbered ports on the back of the Router with your computer. And you must connect the power port with power adapter.
Note : Please don't fix IP address LAN card on yout computer.
2. Open web browser and type http://192.168.15.1 like in the picture below.

2. The dialogue box will appear. The factory default username and password is "admin" and "admin".

2. To begin the RT31P2 VoIP setup select the Voice button.

Line1
Subscriber Information
- Display Name : Your Name
- User ID : Thaitel Account
- Authentication Password : Thaitel Password
- Registration / Proxy Server : ipphone.thaitelplus.com
Voice Quality Settings
- Voice Quality : Normal (G.723 Require 7k Bandwidth) or
Good (G.729 Require 8k Bandwidth)
To make sure that all of functions like in the same status as the picture, then click Save Settings and click OK for saving configuration and reboot RT31P2.
Note: You can use 2 phones. But you must have one Thaitel Account for setting Tab Line2.
5. The page will return in 8 seconds and the Phone 1 LED on the device will illuminate to indicate that the device is registered.

6. When the system is redirected to the main page, click Tab Status and see menu Voice if it shows Registration Status is Online that mean your phone now logging in and ready to use.

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Quality of Service
The Linksys Broadband Router with 2 Phone Ports also maintains an effective Quality of Service (QoS) application.
QoS preserves speech/audio quality by reserving a portion of the available broadband speed for the Voice application. QoS will constrict the available bandwidth avialble for non VoIP (audio) data to upload out to the internet through the Linksys RT31P2-NA. Once enabled, this QoS feature occurs only when a VoIP call is active via the Linksys RT31P2-NA.
Following is a simple method for enabling voice QoS on the Linksys RT31P2-NA:
- From the main menu bar at the top of the RT31P2 screen, click on the Applications & Gaming button.
- In the Applications and Gaming Menu, select QoS on the far right.

- In the Voice QoS section at the bottom of the screen click the Enable radio button.
- Select either Auto Detect or Manual radio buttons. If Manual is selected, then a pre-determined amount of bandwidth to be reserved must be input to the adjacent parameter field.
- Click Save Settings at the bottom of the page. The page will return in 8 seconds.

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How to make a call
To make a call between Thaitel Account
Enter Thaitel Account number and dial
For example : 002900xxxx and dial
To make a call to normal phone or call phone
Enter destination number in this format
[ Country code + City Code + Phone Number ]
For example
Calling to USA : 1800 + phone number
Enter : 18007737126
Calling to England : 44 + City Code + Phone number
Enter : 447880999999
Calling to Bangkok : 66 + 2 + phone number
Enter : 6621234567
Calling to Mobile phone : 668 + Mobile phone number
Enter : 66871234567
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Guide to configure IP Address to IP Phone
1. Firstly, connect one end of an Ethernet network cable to one of the numbered ports on the back of the Router. And you must connect the power port with power adapter.
Note : Please don't fix IP address LAN card on yout computer.

2. When you connected RT31P2 with computer. Open web browser and type http://192.168.15.1 (default LAN IP Address) like in the picture below and dialogue box will appear. The factory default username and password is "admin" and "admin".

3. Basic Internet Setup. On the Basic Setup screen. If you want to connect through a dynamic IP address, you can select Obtain an IP Automatically. After that you can save configuration by click Save Settings and click OK for reboot RT31P2. But If you are required to use a permanent IP address, then select Static IP. And type IP Address, Subnet Mask, Default Gateway and DNS1-3 like in the picture below.

To make sure that all of functions like in the same status as the picture, then click Save Settings and click OK for saving configuration and reboot RT31P2.
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