Interaction

    local n2svcd = require "n2.n2svcd"
    local scp_api = require "n2.n2svcd.scp"

    local handler = function (scp_call)

        local result = scp_api.prompt_and_collect (srp_name, message_id, 'German', nil, 4, 4, options)

        local.result = scp_api.interaction ({
            srp_name = 'DefaultSRP',
            message_id = 1010,
            language = 'English',
            prompt = 1,
            min_num_digits = 4,
            max_num_digits = 4
        })

        -- Note that it is possible to get digits even if the A-Leg control was lost.
        if (result.digits) then
            n2svcd.notice ("DIGITS = %s")

        -- In the case of non-collection, we might have been abandoned, or we might 
        -- have encountered a problem on the SRP (e.g. bad announcement, collection timeout).
        -- At least one explaination will apply.
        --
        else 
            n2svcd.notice ("NON-COLLECT = %s", result.error or result.reason)
        end

        -- If the call control w
        if (result.controlled) then
            scp_api.release_call (5)

        else
            n2svcd.notice ('Interaction Abandoned = %s', result.reason)
        end

        return 
    end

    return n2svcd.handler (handler)

    local n2svcd = require "n2.n2svcd"
    local scp_api = require "n2.n2svcd.scp"

    local handler = function (scp_call)

        local result = scp_api.play_announcement ("SWITCH", { 1070, 1073 }, "German", { { integer = 5000 }})

        if (result.error and result.controlled) then
            result = scp_api.play_announcement ("SWITCH", { 1080, 1073 }, "German", { { integer = 5000 }})
        end

        -- Call will release automatically on exit.
        return 
    end

    return n2svcd.handler (handler)

    local n2svcd = require "n2.n2svcd"
    local scp_api = require "n2.n2svcd.scp"

    local handler = function (scp_call)

        local SWITCH = "SWITCH"

        -- Override some options for no good reason at all.
        local options = {
            end_digit = '*',
            cancel_digit = 'e',
            first_digit_timeout = 6,
            inter_digit_timeout = 4,
            interruptable = false
        }

        -- Collect exactly 4 digits, or none at all.
        local result = scp_api.prompt_and_collect (SWITCH, 3007, nil, nil, 4, 4, options)

        -- If the caller is gone, we don't bother going on.
        if (not result.controlled) then
            return
        end

        -- Our scenario REQUIRES digits.
        if (not result.digits or not string.len (result.digits)) then
            error "No digits entered, cannot continue."
        end

        -- Play back the collected digits (as "number digits" type).
        result = scp_api.play_announcement (SWITCH, 4040 nil, { { number_digits = result.digits } })

        -- This will automatically release the call (if needed) with default release cause.
        return 
    end

    return n2svcd.handler (handler)