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All Digium software products which require a license key use the same basic process for registering the licenses.  The register utility (available at http://downloads.digium.com/pub/register/ ) must be executed on the target system for every key you wish to register.  During the registration process, the target host is examined, and a host ID is computed (primarily from the Ethernet devices available on the system).  Once the registration process is complete, this host ID is stored in Digium's activation database, and the license file for that key  with host ID is written to /var/lib/asterisk/licenses or /var/lib/digium/licenses.  After the license file has been written, the given Asterisk module can be reloaded (or Asterisk restarted) to use the channels provided by the new license.  See the README accompanying each individual software product for installation and registration details.

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