freeSwitch DISA实现

D.I.S.A. (Direct Inward System Access)，是提供一种呼入平台转呼出的特性。注意这类特性的安全。摘录来自wiki的一个lua实例。

dialplan:

<extension name="disa"><condition field="destination_number" expression="^disa$"><action application="lua" data="disa.lua"/></condition>
</extension>

disa.lua

api = freeswitch.API();
domain = freeswitch.getGlobalVariable("domain_name");
user_id = "";
creds_tries = 0;
creds_tries_limit = 3;
authorized = false;
invalid_entry_sound = "ivr/ivr-that_was_an_invalid_entry.wav";
no_permissions_sound = "ivr/ivr-not_have_permission.wav";
dialtone = "tone_stream://%(10000,0,350,440)";
end_call_sound = "tone_stream://%L=3;(100,100,350,440)";session:answer();if (session:ready()) then-- Line is live, start talkingsession:flushDigits();session:execute("playback", "silence_stream://1500");session:execute("playback", "ivr/ivr-hello.wav");-- Try authenticationwhile (creds_tries_limit >= creds_tries) do-- Prompt for user iduser_id = session:playAndGetDigits(1, 10, creds_tries_limit, 3000, "#", "ivr/ivr-please_enter_extension_followed_by_pound.wav", invalid_entry_sound, "\\d+", "", 3000);if (user_id == "") then-- Exceeded triescreds_tries = creds_tries_limit;elseif (api:executeString("user_exists id ".. user_id .. " " .. domain)) then-- User id exists, prompt for pinpin = session:playAndGetDigits(1, 64, 3, 3000, "#", "ivr/ivr-please_enter_pin_followed_by_pound.wav", invalid_entry_sound, "\\d+", "", 3000);pin_valid = "";freeswitch.consoleLog("info", "PIN valid: " .. pin_valid);if (pin == "") then-- Exceeded triescreds_tries = creds_tries_limit;elsepin_valid = api:executeString("vm_fsdb_auth_login default " .. domain .. " " .. user_id .. " " .. pin);freeswitch.consoleLog("info", "PIN valid: " .. pin_valid);if (pin_valid == "-OK") then-- DISA Authenticated-- Make sure user is authorized for DISAtoll_allow = api:executeString("user_data " .. user_id .. "@" .. domain .. " var toll_allow");if(string.match(toll_allow, "disa")) then-- Authorized for serviceauthorized = true;break;else-- Not authorized for servicesession:execute("playback", no_permissions_sound);break;endelse-- Bad pinsession:execute("playback", invalid_entry_sound);creds_tries = creds_tries + 1;endendelse-- Bad user idsession:execute("playback", invalid_entry_sound);creds_tries = creds_tries + 1;endendif (authorized) then-- Authorized for service, play instructions and give dialtonesession:execute("playback", "ivr/ivr-please_enter_the_phone_number.wav");session:execute("playback", "ivr/ivr-followed_by_pound.wav");digits = session:playAndGetDigits(2, 15, 1, 15000, "#", dialtone, invalid_entry_sound, "\\d+", "", "3000");if (digits == "") thensession:execute("playback", "voicemail/vm-goodbye.wav");else-- Set user using set_user dialplan application, then transfer the callsession:execute("set_user", user_id .. "@" .. domain);session:execute("transfer", digits .. " XML default");endelsesession:execute("playback", "voicemail/vm-goodbye.wav");endend

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