https://www.allstarlink.org/support/
https://www.repeaterbook.com/repeaters/feature_search.php?state_id=13&type=AllStar
https://www.qsl.net/kb9mwr/projects/voip/asterisk_rob-n4wgy.pdf
https://na0tc.org/lib/exe/fetch.php?media=technical:allstar1_rev.pdf