To upgrade from Asterisk 1.4 to 1.6

1. Do:
   • ls -l /usr/lib/asterisk/modules/codec_g729* # To check if G.729 is in use.
   • mv /usr/lib/asterisk/modules /usr/lib/asterisk/modules-1.4
   • enswitch install -u asterisk-162
   • mv /etc/zaptel.conf /etc/zaptel.backup
   • ls -l /etc/asterisk/chan_dahdi.conf # Ignore next step if it already exists.
   • cp /opt/enswitch/current/install/etc/asterisk/chan_dahdi.conf /etc/asterisk # Only if it doesn't exist.
2. If using G.729, do:
   • enswitch install -u g729-162
3. Edit /etc/rc.modules or /etc/modules (depending on Linux distribution), and remove any Zaptel-specific modules that are not needed by DAHDI. "zaptel" and "ztdummy" are the most common.
4. Edit /etc/asterisk/asterisk.conf, and ensure that this line exists under [compat], making [compat] at the top of the file if necessary:

   res_agi = 1.6

5. Edit /etc/asterisk/musiconhold.conf, and ensure that this line exists under [general], making [general] at the top of the file if necessary:

   cachertclasses = no

6. Edit /etc/asterisk/extconfig.conf, and ensure that this line exists under [settings]:

   musiconhold => mysql,enswitch,musiconhold

7. Edit /etc/asterisk/res_mysql.conf, and change "[general]" to "[enswitch]".
8. Edit /etc/asterisk/extensions.conf, replace any mentions of "DeadAGI" with "AGI", and replace "extensions_enswitch.conf" with "extensions_enswitch_16.conf".
9. Edit /etc/asterisk/manager.conf, and ensure that these lines exist for [enswitch]:

   read = agent,call,cdr,command,config,dialplan,dtmf,log,originate,reporting,system,user,verbose
   write = agent,call,cdr,command,config,dialplan,dtmf,log,originate,reporting,system,user,verbose

10. Edit /etc/asterisk/features.conf, and add this line under [general]:

    comebacktoorigin = no

    then change parkext to something impossible such as "AAAAAA".
11. If allowing parked calls to return to the parking telephone, edit /etc/asterisk/features.conf and change parkingtime to the desired timeout in seconds.
12. Edit /etc/asterisk/iax.conf, and add these lines under [general]:

    requirecalltoken = no
    calltokenoptional = 127.0.0.1/255.255.255.255

13. Edit /etc/asterisk/iax.conf and /etc/asterisk/sip.conf, and add "allow = g722" with the other codecs.
14. If all machines in the cluster are running 1.6, then on the Enswitch web interface, under System » Configuration, set "Asterisk version" to "1.6". Otherwise create a /etc/enswitch/local.conf file containing a line "asterisk_version = 1.6".
15. Reboot the Asterisk machine.
16. Test calls.