When using FreePBX 2.8x and/or Elastix you experience the following error:
retrieve_conf failed to sym link:
/etc/asterisk/chan_dahdi.conf from dahdiconfig/etc
This can result in FATAL failures to your PBX. If the target file exists and not identical, the symlink will not occur and you should rename the target file to allow the automatic sym link to occur and remove this error, unless this is an intentional customization.
To resolve this error:
1. $ rm -f /var/www/html/admin/modules/dahdiconfig/etc/chan_dahdi.conf
2. $ amportal restart
For further details click here.