Category Archives: VoIP

Asterisk Beep on Attended Transfer

Asterisk can produce a beep sound when doing a DTMF attended transfer by setting the relevant options in features.conf

But if you use the SIP phones transfer feature buttons, the default is that there is no beep tone.

If you want to produce a beep tone when the transfer is completed using the feature keys, Asterisk has a relatively hidden option for that.

Set the¬†ATTENDED_TRANSFER_COMPLETE_SOUND channel variable to ‘beep’ prior to dialling and that will cause the recipient to hear a beep tone.



asterisk: error while loading shared libraries: cannot open shared object file: No such file or directory


You install Asterisk 12 successfully but receive the following error when trying to launch asterisk:

asterisk: error while loading shared libraries: cannot open shared object file: No such file or directory


Execute this

echo “/usr/local/lib” > /etc/




I’m not expert on this. Can anyone explain why this works? I’ll give you a link to your website in return.

Disable SIP ALG on ZyXEL P661

Disabling SIP ALG – ZyXEL P661

 WARNING, deviating from these steps may cause the device to become non-responsive.

  1. Ensure the computer is connected to the router.
  2. From the Windows desktop open a Command Prompt window.
    Navigate: Start > All Programs > Accessories > Command Prompt.
  3. At the prompt type ipconfig then press the Enter key.
  4. From the Ethernet adapter Local Area Connection section, locate the Default Gateway address (e.g.,
    The Default Gateway address will vary depending upon the configuration.
  5. At the prompt type telnet then press the Enter key.
    If telnet is not recognized, you may need to use something like Putty (
  6. Enter the router password then press the Enter key.
    The default password is 1234.
  7. At the prompt type ‘ip nat service sip active 0′ without quotes, the last letter is a zero then press the Enter key.
  8. After being told that sip alg has been disabled, type in Exit.

XLite 5 Dial plan not working properly

I had a problem recently with a user who upgraded to XLite 5 SIP Softphone.

Regardless of the numbers and settings, XLite 5 will force you to dial in the international format, regardless of whether that is correct.


To get around this issue, dial x before any number which will make xlite think you are dialling an internal extension and therefore won’t play with the number dialled.

For example, x001555123456

More information: