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The Linksys Internet Phone Adapter enables high-quality feature-rich VoIP (voice over IP) service through your broadband Internet connection. Just plug it into your home Router or Gateway and use the two standard telephone ports to connect analog phones or use one of the ports for a fax machine. Each phone port operates independently, with separate phone service and phone numbers, like having two telephone lines. You'll get clear reception and a reliable fax connection, even while using the Internet at the same time.

The PAP2 and PAP2T have the same functionality (although different hardware). PAP2-NA stands for "North America" (same functionality)


1.    Connect your router with the supplied Ethernet network cable to the PAP2.

2.    Connect your phone to the PAP2 Line 1 port.

3.    Finally plug the supplied power cable into the PAP2.

Wait 60 seconds after plugging your PAP2 in.

If you are replacing another VOIP box, then re-boot or power OFF/ON all of your hardware, including your Router and your PC(s).



You must pickup a number of parameters from your VOIP provider. For example, Clearpointel allows you to login to your account and click on "SIP Settings". Here you find the values of all the parameters that need to be set using the following steps.



You must first determine what IP address it received. To do this, you need to pick up the phone attached to the Line 1 jack and

dial:   **** (four asterisks)
then dial:  110#

and you will hear the IP address of your device (e.g.



On your PC (connected to the same LAN or router), use an internet browser (e.g. IE Explorer) and enter the URL address: http://<IP ADDRESS>

(where <IP ADDRESS> is the address that was given to you in STEP 1.

You should now be communicating to the Lynksys ATA and you should see the following screen:

Config main screen 


Please note that the PAP2 by default does not have a password assigned to it, so you should see the above sceen immediately.

If instead you are prompted to enter the username and password please enter it and you should see the image above.



Click on the "Admin Login" button near the top right side of the screen:

ATA Main Menu 


then click on the "Line 1" tab.

Main Manu Line 1 Tab 


On this screen, you need to modify only a few parameters from the factory default.
They are:


e.g.: voip.clearpointel.ca

Register Expires:

e.g.: 180

Display Name:

Enter the name you want to show as your caller ID.

User ID:  

Enter the phone number you chose when you signed up for Clearpointel service. E.g.: 16473334444


Enter the password that was provided by your VOIP provider.

Line 1 Parameters 

On this same screen, scroll towards the bottom of the page.

Line 1 parameter config 

Change the "Preferred Codec"  to G729a (To save bandwidth).

(Also make sure the "Use Pref Codec Only" is set to No). You can only do this for one line. So, if Line 1 is on G.729a, Line 2 has to be some other codecs.



Switch to “Advanced view”.

Switch to Advanced view 

Click on the "SIP" tab on the main menu.

SIP parameter Tab 

Scroll down to the "RTP Parameters" section.

Set RTP Packet Size to: 0.020



Click on the “Regional" tab on the main menu.

Regional parameters Tab 


Scroll down to the Ring and Call Waiting Tone Spec section.

Set Ring Tone Frequency to: 52
Set Ring Tone Voltage
to: 90

Scroll to the bottom of the Regional page.

In the "Time Zone" field select the number of hours plus or minus that your local time is offset from Greenwich Mean Time (GMT).



Click on the "Save Settings " button at the bottom of the page:

Save settings buttons 


You are now ready to make and receive calls!


Before trying any complex fix, make sure you have the latest firmware for your PAP2(T) box. Currently it seems to be 3.1.22(LS).

PROBLEM 1: You may be able to receive calls, they hear you, but you do not hear them. Also you cannot read your voice messages, as the other side does not hear your dial buttons.

This may be due to the type of router you have: You may have a router without the SIP Application Layer Gateway (ALG). In this case, if you do not want to replace your router, you can try the following settings:

Click on the "SIP" tab.

 SIP parameter Tab

Modify the following parameters (Configuring Network Address Translation - NAT - with a Static IP address):

Handle VIA received: yes
Handle VIA rport: yes
Insert VIA received: yes
Insert VIA rport: yes
Substitute VIA Addr: yes
Send Resp To Src Port: yes
STUN Enable: no
STUN Test Enable: no
STUN server: <leave blank>
xxx.xxx.xxx.xxx (This is the External IP address of your router. If you do not know your IP address, you can use a browser and go to: www.whatismyip.com to find out.)

Then Click on the "Line 1" tab

Main Manu Line 1 Tab

and set the following parameters:

NAT Mapping Enable: yes
NAT Keep Alive Enable: yes

Click on the "Save Settings " button at the bottom of the page:

Save settings buttons 

Hopefully this solved your problem.

NOTE: If you are on cable and there is a power outage or your cable service is disrupted, your IP address may change and you have to remember to change your EXT IP parameter in the ATA PAP2 box as well.


PROBLEM 2: No ring. You may not hear the ring, or the ring is a few random beeps.

First the obvious: Make sure your phone set ringer isn't turned off.

The type of ring you hear may be dependent on the phone set you are using.
The best phones to work with the PAP2 are analogue with power supply or some cordless phones. Keep at least one of those near you.

Click on the “Regional" tab on the main menu, as in STEP 5 above and try the following combination of parameters, until you hear a ring.

Ring Waveform: Try both Sinusoid and Trapezoid;
Ring Tone Frequency
: Try the following values: 20, 25, 30, 35, 40, 45, 50, 55.
Ring Tone Voltage
: to: Try the following values: 70, 75, 80, 85, 90.

If one of the above combinations gave you a good ring, you solved your problem. Otherwise...

You may have a defective Line 1 on the Linksys box (not generating the right voltage/frequency). Try to invert Line1 with Line 2.
To do this:
-copy the parameters you set in STEP 3 into Line 2;
-Invert the "SIP Port" numbers: (Line 1 is now 5061 and Line 2 is 5060);
-Plug your telephone set in Line2.






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