This document refers to TNG for Asterisk.
Username must be in the Asterisk Database for the SIP extension
TNG version 22.214.171.124 or newer
See forum post: TNG for Asterisk version 126.96.36.199 upgrade
NOTE: all the above requirements must be in place. TNG will auto update the extension names from the Asterisk database to TNG.
Refer to “Configuration required in TNG:” section in forum post: Can my user names for extensions be auto updated to TNG?