You can configure the lookup path for the lua library in kamailio.lua
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local cur_dir = debug.getinfo(1).source
cur_dir = string.gsub(debug.getinfo(1).source, "^(a)(.+/)kamailio.lua$"lua$",
"%1")
package.path = package.path .. ";" .. cur_dir .. "?.lua"
package.path = package.path .. ";" .. cur_dir .. "routing/?.lua"
local utils = require 'logger'
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