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VoIP Networking & LAN Issues

The LAN is everything in your network starting from the Internet connection.  In most cases this will be from the modem inward.  It can include the IAD/router, other routers, switches and computers.  How these devices are networked can affect the connectivity of your IAD and computers.  Looking at the devices and how they are connected can often lead to solving some issues, including one-way audio and lost connections.

There are several different VoIP ATA's, find out which ATA can be used with the provider you want to sign up with and the buy it yourself from a trusted supplier.Your IAD/router or ATA device.

Many homes and small commercial networks using VoIP use one of a few ATA/router devices. 

Upgrade or expand your existing network with Networking Equipment from VoIP Supply, the leading VoIP hardware supplier since 2002.

Some popular models are:

Sipura, which became Linksys and then Cisco/Linksys, have built in diagnostic light patterns that help diagnose certain conditions.  The more important blink patterns are as follows:

  • Slow Blinking (0.5s On, 0.5s Off - continuous) - This patter could indicate that the system is booting up or initializing and could be as long as 10 seconds.  Or it is looking for DHCP.  (Or possibly that  Firmware is downloading)
  • Link Error (long, short, short, Off for 2 seconds) - This pattern indicates that No Ethernet link is detected.
  • Error 2 (short, short, long, long, off for 2 seconds) - This could indicate a duplicate IP is detected.
  • Fast Blinking (0.1s On, 0.1s Off - continuous) - Indicates it is writing the firmware to flash.

Some others are:

  • Error 1 (short, short, long, off for 2 seconds) - Device is using the back up IP address or the last known good IP address.
  • SOS (short 3 times, 2 longs, short 3 times off for 2 seconds) - This could indicate the firmware is in recovery mode.

VoIP ATA manuals for Linksys spa9000, pap2t, and sps2002.

Both the Sipura and the Cisco/Linksys PAP2 ATAs have built in an IVR (Interactive Voice Response) into their firmware.  You can access this IVR by using a connected phone and pressing **** (the star button 4 times).  You should then be greeted by the voice response asking you to place a command followed by the # (pound) sign.  A list of these commands are as follows:



DHCP Client status (whether or not the unit obtains its IP address by DHCP).


Announces the current IP address of the device.


Change DHCP client. (1 to enable, 0 to disable)


Assign the ATA a static IP address.  To assign a static IP address, replace the dots in the IP address with the star key and then terminate with the pound key.  (DHCP must be disabled, otherwise you will hear Invalid Option.)


Announces the subnet mask.


Used to set the subnet mask.  (Use the same format as with 111 command.)


Announces the default route (gateway).


Sets the default gateway.  (Use the same format as with 111 command.)

140 Announces the MAC address of the adapter.
160 Announces current setting of primary DNS Server.


Tells you the firmware version.


Reboots the ATA, resets all configurations back to default.  Requires password.

 List of IVR commands for Sipura & PAP2 ATAs

The Linksys RT31P2 and RT41P2 both are combination routers - ATAs. They have the traditional Linksys router options like their 4 port Linksys counterparts, as well as a Voice ATA sitting on the WAN side of the device.  They have 3 Ethernet ports to attach other devices (computers) to the LAN.

The Linksys router/IAD RT41P2 can be accessed by connecting a computer to one of it's numbered Ethernet ports and using a web browser with the following address and information:

  • Username left blank, Password "admin"

Description of a Linksys RT31P2-AT and RT41P2 Lights

Power    This light should be solid green.  It will light up when the router is powered on, and will flash as it is booting up, which will last for a brief time.  If the power light continues to flash, this could indicate a problem with router�s firmware.           Ethernet 1-3  Each corresponding light should display a solid green if there is a corresponding active device plugged into that port.  It will flash when it is sending or receiving data.  If no light is lit, this could indicate a problem with the device, router port or cable.                                                                                                           Phone 1-2  The phone ports will flash when a connected phone is being used or an incoming call has been detected.  When the phone is not in use the LED will be solid as long as the IAD is registered.  If the LED is not lit, then the IAD has no current registered connection.                                                                                                                        Internet  The Internet light will light green when it is connected to your ISP�s modem and will flash as data is received or transmitted.

Continue : routers and switches

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