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VOIP means Voice Over Internet Protocol, where your telephone service is provided via the internet.

Using VOIP with a TP-Link modem

If you are using VOIP with a TP-Link modem you may experience problems such as voice being received but not transmitted after a connection is established. This may be addressed with a command line setting change in the modem to enable this via telnet to

ip nat service sip sw off

If the command is successful the following line will be returned:

nat sip v2 switch off

Accessing Telnet


Entering the command on Ubuntu Linux

On Linux operating systems you can access telnet by opening a terminal and typing in "telnet" at the prompt.


On Windows XP and Vista operating systems telnet can be accesses by using the run command and entering telnet.

Windows 7 and 8 does not support telnet out of the box, but is can be run by installing and using the PuTTY free software application.