G.729 and G.723 Codec installation on Asterisk

Installation and Configuration of G.729 and G.723 codecs on asterisk

1. Download the codec binary file from http://asterisk.hosting.lv/bin/codec_g729-ast14-gcc4-glibc-pentium4.so
2. Copy it to the /usr/lib/asterisk/modules folder.
3. Restart the Asterisk: /etc/init.d/asterisk restart

Estimating the Number of G.729 Channels Required

If you choose to purchase the G.729 license from Digium you will need to compute the number of G.729 channels required by your configuration. You can estimate the required value by using the following information:

• a call between two SIP extensions usually requires two G.729 channels, unless the pass-thru mode is used (http://voip-info.org/wiki/view/Asterisk+G.729+pass-thru), in which case it doesn’t require any G.729 channel.
• a call between a SIP extension and a Zaptel/DAHDI extension/trunk requires one G.729 channel.
• a call to Voice Mail or another Asterisk service where IVR messages must be played requires one G.729 channel.

SIP Trunking - IP Based authentication and Password based authentication

SIP trunking is the method of sending calls to ITSP service provider using sip protocol.

Indepth details refer RFC 3261

There are two types of authentications

1. IP based authentication
2.Username and Password based authentication


For IP Based Authentication

You need to do the following changes in the sip.conf


[siptrunk]
type=friend
fromuser=X.X.X.X ( your asterisk server ip ) which will send traffic to the service provider
host=X.X.X.X ( service provider ip )
canreinvite=no
qualify=no
dtmfmode=RFC2833
context=intenal
disallow=all
allow=g729
allow=ulaw
allow=alaw
port=5060


Then you need to edit extensions.conf
[intenal]
exten => _9X.,1,Dial(SIP/${EXTEN}@siptrunk)


For Username and password based authentication

[siptrunk]
type=friend
username=
fromuser=X.X.X.X
host=X.X.X.X
canreinvite=no
secret=
qualify=no
dtmfmode=RFC2833
context=intenal
disallow=all
allow=g729
allow=ulaw
allow=alaw
port=5060

define username and password to it