IsRedirectionLoopConfigured()

Lua → VBScript

This function returns true if the current script user has an unconditional redirection to a user configured, where the current call already has been (in his call routing).

Please see the Introduction chapter for some usage instructions.

------------------------------------------------------------------  
-- IsRedirectionLoopConfigured 
--  
-- Checks if the undonditional redirection target of the script user is
-- already in the PreviousScripts list, i.e. the call was previously already in that user's call routing.
--
-- Parameter:
--
-- Return:
--   boolean 
------------------------------------------------------------------
function IsRedirectionLoopConfigured()
    PBXScript.OutputTrace ("-------------> IsRedirectionLoopConfigured")

    local bReturn = false

    if PBXUser.UnconditionalRedirect() then

        local sRedirectToUser = GetUserNameFromExtension(PBXUser.UnconditionalRedirectNumber())
        local tScripts = nil

        tScripts = PBXScript.PreviousScripts()
        if (tScripts ~= nil) then
            for i = 1, #tScripts do
    
                PBXScript.OutputTrace ("PreviousScript.username = " .. tScripts[i].username)
    
                if (tScripts[i].username == sRedirectToUser) then
                    PBXScript.OutputTrace ("Found redirection target in the PreviousScripts list. So this is most likely a loop!")
                    bReturn = true
                end
                
            end
        end
    end

    PBXScript.OutputTrace ("bReturn = " .. tostring(bReturn))
    PBXScript.OutputTrace ("<------------- IsRedirectionLoopConfigured")

    return bReturn
end

This function makes use of the function GetUserNameFromExtension() to get the username of the destination the current script user has an unconditional redirection configured to. Afterwards it uses the Server Script API function PBXScript.PreviousScripts() to search the username in the list of previous call routing scripts.

Once this function returns true the idea is to disabled the unconditional redirection to prevent a loop.

if IsRedirectionLoopConfigured() then
    PBXUser.UnconditionalRedirect(false)
end

There is another function IsLoopConfigured() available, following another approach to identify an existing call loop.

Please take a look into the How to avoid loops topic for more details.

This function was converted from VBScript into Lua from the initially posted version in this forum topic.

By Tom Wellige

June 5, 2022

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Function Collection (Lua)

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IsRedirectionLoopConfigured()

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