ATech Machine LIBRA-02 M Technical Information PDF herunterladen (Seite 247)

exten => start,1,VoiceMail(${ARG1}@${ARG2},${ARG3})

same => n,Hangup()

In this version we’ve made just the one change: Return() to Return(${DIALSTATUS}).

Now we can modify extension 101 to use the ${GOSUB_RETVAL} channel variable, which

will be set by Return():

exten => 101,1,GoSub(subDialer,start,1(${JOHN},30))

same => n,Set(VoicemailMessage=${IF($[${GOSUB_RETVAL} = BUSY]?b:u)})

same => n,GoSub(subVoicemail,start,1(${EXTEN},default,${VoicemailMessage}))

Our dialplan now has a new line that sets the ${VoicemailMessage} channel variable to

a value of u or b, using the IF() dialplan function and the value of ${GOSUB_RETVAL}. We

then pass the value of ${VoicemailMessage} as the third argument to our subVoice

mail subroutine.

Before moving on, you might want to go back and review “Macros” on page 204

and“GoSub()” on page 207. We’ve given you a lot to digest here, but these concepts

will save you a lot of work as you start building your dialplans.

Local Channels

Local channels are a method of executing dialplans from the Dial() application. They

may seem like a bit of a strange concept when you first start using them, but believe us

when we tell you they are a glorious and extremely useful feature that you will almost

certainly want to make use of when you start writing advanced dialplans. The best way

to illustrate the use of Local channels is through an example. Let’s suppose we have a

situation where we need to ring multiple people, but we need to provide delays of

different lengths before dialing each of the members. The use of Local channels is the

only solution to the problem.

With the Dial() application, you can certainly ring multiple endpoints, but all three

channels will ring at the same time, and for the same length of time. Dialing multiple

channels at the same time is done like so:

[LocalSets]

exten => 107,1,Verbose(2,Dialing multiple locations simultaneously)

same => n,Dial(SIP/0000FFFF0001&DAHDI/g0/14165551212&SIP/MyITSP/12565551212,30)

same => n,Hangup()

This example dials three destinations for a period of 30 seconds. If none of those lo-

cations answers the call within 30 seconds, the dialplan continues to the next line and

the call is hung up.

However, let’s say we want to introduce some delays, and stop ringing locations at

different times. Using Local channels gives us independent control over each of the

channels we want to dial, so we can introduce delays and control the period of time for

which each channel rings independently. We’re going to show you how this is done in

the dialplan, both within a table that shows the delays visually, and all together in a

Local Channels | 211

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ATech Machine LIBRA-02 M Technical Information Seite 247

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