To upgrade from Asterisk 18 to 22

1. If Enswitch is at version 4.4 or earlier, first upgrade to 4.4.
2. Make sure the latest Enswitch fixes are installed.
3. Do:
   • ls -l /usr/lib/asterisk/modules/codec_g729* # To check if G.729 is in use.
   • enswitch install -u asterisk
4. If using G.729:
   • enswitch install -u g729-18
5. Reboot the Asterisk machine.
6. Test calls.