Asterisk : The Cookbook 食譜 034 - 輪用辦公桌

Q034: 我想提供輪用辦公桌(Hot-Desking)使用電話系統，請問該怎麼設計？

說真的，以目前的食譜要來設計這樣的需求是足夠了，先來看看流程圖

簡單講就是，判斷是不是有人已經用同一支電話登入了，如果有，就將它登出，然後再用新的登入，否則直接登入。

底下直接寫範例(我也還在研讀當中):

[HotDesking]
  exten => 7000,1,Verbose(2,Attempting logoff from device ${CHANNEL(peername)})
    same => n,Set(PeerName=${CHANNEL(peername)})
    same => n,Set(CurrentExtension=${DB(HotDesk/${PeerName})})
    same => n,GoSubIf($[${EXISTS(${CurrentExtension})}]?  subDeviceLogoff,1(${PeerName},${CurrentExtension}):loggedoff)
    same => n,GotoIf($[${GOSUB_RETVAL} = 0]?loggedoff)
    same => n,Playback(an-error-has-occurred)
    same => n,Hangup()
    same => n(loggedoff),Playback(silence/1&agent-loggedoff)
    same => n,Hangup()
上面這段設定分機號碼 7000 用來登出裝置，

1. 裝置以 ${PeerName} = ${CHANNEL(peername)} 表示，
2. 分機號碼以 ${DB(HotDesk/${PeerName})} 表示

底下 71XX 則表示先登出現有的分機號碼再登入

  exten => _71XX,1,Verbose(2,Attempting to login device ${CHANNEL(peername)} to extension ${EXTEN:1})
    same => n,Set(NewPeerName=${CHANNEL(peername)})
    same => n,Set(NewExtension=${EXTEN:1})

    same => n,Set(ExistingExtension=${DB(HotDesk/${NewPeerName})})
    same => n,GotoIf($[${EXISTS(${ExistingExtension})}]?get_existing_device)

    same => n(check_device),NoOp()
    same => n,Set(ExistingDevice=${DB(HotDesk/${NewExtension})})
    same => n,GotoIf($[${EXISTS(${ExistingDevice})}]?get_existing_extension)
    same => n,NoOp(Nothing to logout)
    same => n,Goto(login)

    same => n(get_existing_device),NoOp()
    same => n,Set(ExistingDevice=${DB(HotDesk/${ExistingExtension})})
    same => n,GotoIf($[${ISNULL(${ExistingDevice})}]?login)
    same => n,GoSub(subDeviceLogoff,1(${ExistingDevice},${ExistingExtension}))
    same => n,GotoIf($[${GOSUB_RETVAL} = 0]?check_device)
    same => n,Playback(silence/1&an-error-has-occurred)
    same => n,Hangup()

    same => n(get_existing_extension),NoOp()
    same => n,Set(ExistingExtension=${DB(HotDesk/${ExistingDevice})})
    same => n,GoSubIf($[${EXISTS(${ExistingExtension})}]? subDeviceLogoff,1(${ExistingDevice},${ExistingExtension}):remove_device)
    same => n,GotoIf($[${GOSUB_RETVAL} = 0]?loggedoff)
    same => n,Playback(silence/1&an-error-has-occurred)
    same => n,Hangup()

    same => n(remove_device),NoOp()
    same => n,Set(Result=${DB_DELETE(HotDesk/${ExistingDevice})})
    same => n,Goto(loggedoff)

    same => n(loggedoff),Verbose(2,Existing device and extensions have been logged off prior to login)

    same => n(login),Verbose(2,Now logging in extension ${NewExtension} to device ${NewPeerName})
    same => n,GoSub(subDeviceLogin,1(${NewPeerName},${NewExtension}))
    same => n,GotoIf($[${GOSUB_RETVAL} = 0]?login_ok)
    same => n,Playback(silence/1&an-error-has-occurred)
    same => n,Hangup()

    same => n(login_ok),Playback(silence/1&agent-loginok)
    same => n,Hangup()

  exten => subDeviceLogoff,1,NoOp()
    same => n,Set(LOCAL(PeerName)=${ARG1})
    same => n,Set(LOCAL(Extension)=${ARG2})
    same => n,ExecIf($[${ISNULL(${LOCAL(PeerName)})} | ${ISNULL(${LOCAL(Extension)})}]?Return(-1))
    same => n,Set(PeerNameResult=${DB_DELETE(HotDesk/${LOCAL(PeerName)})})
    same => n,Set(ExtensionResult=${DB_DELETE(HotDesk/${LOCAL(Extension)})})
    same => n,Return(0)

  exten => subDeviceLogin,1,NoOp()
    same => n,Set(LOCAL(PeerName)=${ARG1})
    same => n,Set(LOCAL(Extension)=${ARG2})
    same => n,ExecIf($[${ISNULL(${LOCAL(PeerName)})} | ${ISNULL(${LOCAL(Extension)})}]?Return(-1))
    same => n,Set(DB(HotDesk/${LOCAL(PeerName)})=${LOCAL(Extension)})
    same => n,Set(DB(HotDesk/${LOCAL(Extension)})=${LOCAL(PeerName)})
    same => n,Set(ReturnResult=${IF($[${DB_EXISTS(HotDesk/${LOCAL(PeerName)})} & ${DB_EXISTS(HotDesk/${LOCAL(Extension)})}]?0:-1)})
    same => n,Return(${ReturnResult})