User guide

• Enable the possibility of receiving audio by the same port that we send audio.
In the PBX:
• Inform Asterisk that the softphone is inside of a NAT.
A good softphone running SIP that works well inside of a NAT is X-Lite from Xten.
38
IAX2 softphones inside of a NAT should not present major problems. Ensure that the IAX2 UDP port
4569 is not blocked. A good softphone running IAX2 is iaxcomm.
39
From the conceptual point of view, the configuration of the softphone is not much different from any
other VoIP client. Use the user/password 465/465pass and 466/466pass in each of the softphones.
Ensure that the G711 (u-law) codec is enable and that the IP address of our PBX is set to:
192.168.46.1
Image 9: The Farmers' Association is connected to the Telecentre using a wireless NAT. A softphone is installed
in each of the two computers. The first client is using SIP while the second uses IAX2.
7.3 Configuring Asterisk
Step 1: Define and Configure Communication Channels
In this first scenario we have two types of communication channels: SIP and IAX2, which implies that
we need to edit the files sip.conf and iax.conf.
Note that comments in Asterisk configuration files start with a semi-colon.
38. A free version can be downloaded from http://www.xten.com/index.php?menu=download
39. IaxComm can be downladed from http://iaxclient.sourceforge.net
Page 31 TRICALCAR | www.wilac.net/tricalcar – Version: February 2008