Articles in the voice category

1. Linksys SIP Phone Losing User Settings?

   Posted on January 29, 2008 in voice

   During a recent project, I was asked to configure a Linksys SPA942 4-Line IP Telephone to work with Asterisk in an medium-sized office environment. Since this phone was going to be one of many used in a corporate environment, I decided I would need one master configuration, and then individual …

2. Asterisk WaitExten() Music on Hold Option Only Uses Default Class

   Posted on January 10, 2008 in voice

   This might be a bug with the particular version of Asterisk 1.2 I'm using, but it's pretty darn annoying. Hopefully, it doesn't effect you if you are using the latest version of 1.2 or 1.4.

   What I'm trying to do is play some background music while I …

3. T.37 Store and Forward Fax and Cisco AS5300: Dial Peers

   Posted on January 09, 2008 in voice

   Note: This is part of a discussion regarding the configuration of a Cisco AS5300 for T.37 Store and Forward Faxing.

   The final piece of the T.37 Store and Forward Fax configuration is the dial peers to handle the incoming fax and the outgoing email. I'll walk you through …

4. TCL Onramp Script for T.37 Store and Forward Fax

   Posted on January 08, 2008 in voice

   Note: This is part of a discussion regarding the configuration of a Cisco AS5300 for T.37 Store and Forward Faxing.

   Unfortunately, the Cisco AS5300 does not have the ability to handle incoming fax processing without the help of additional software. You can download the app_faxmail_onramp TCL script from the …

5. T.37 Store and Forward Fax and Cisco AS5300: MTA and General Setup

   Posted on January 07, 2008 in voice

   I was recently engaged to configure a fax-to-email solution using a Cisco AS5300 and Asterisk. My original idea was to compile spandsp into Asterisk and use the RxFax() application to receive faxes. Everything seemed to work OK on the Asterisk side, but I had a lot of trouble with incoming …

6. T.37 Store and Forward Fax and Cisco AS5300: Full Configuration

   Posted on January 02, 2008 in voice

   !
   fax receive called-subscriber $d$
   fax interface-type fax-mail
   mta send server mail.example.com port 25
   mta send subject Incoming Fax Received
   mta send postmaster postmaster@example.com
   mta send mail-from hostname example.com
   mta send mail-from username $s$
   !
   call application voice onramp flash:app_faxmail_onramp.2.0.1.3.tcl
   !
   dial-peer …

7. Asterisk Channel Variables and the Asterisk::AGI Perl Module

   Posted on May 14, 2007 in voice

   When calling an AGI from inside your dialplan, you can pass variables to your AGI via the AGI() application call. The AGI() application takes parameters in the following format (note the ';' is only necessary in AEL:

   AGI(command|ARG1|ARG2|ARGn);
   

   The additional arguments are useful when passing in non-channel …

8. Debugging AGIs In Asterisk

   Posted on April 30, 2007 in voice

   Trying to debug an <acronym title="Asterisk Gateway Interface">AGI</acronym> in Asterisk can be a frustrating experience. The main problem is that STDERR only outputs to the terminal Asterisk was started from. In most cases, this means the terminal is the server console. If your Asterisk server is sitting …

9. VoIP Hairpinning Issues

   Posted on April 16, 2007 in voice

   When using Asterisk and a remote bank of <acronym title="Primary Rate Interface">PRI</acronym>s (or any other form of <acronym title="Public Switched Telephone Network">PSTN</acronym> connectivity for that matter), you may encounter an issue known as hairpinning. Hairpinning describes what happens when a call coming from …