[Asterisk-Users] NuFone + VoIPJet = busy busy busy

[Andrew Kohlsmith]

On March 9, 2005 10:43 am, Cirelle Internet Products wrote:
> How are you determining a fallback condition from one voip to another?

Mine's rather simple but it works well:

[macro-nufone-dial]
exten => s,1,GotoIf($[$ACCOUNTCODE != ""],s,gotac)
exten => s,n,SetVar(ACCOUNTCODE=${ARG2})
exten => s,n,GotoIf($[{$ARG2} != ""],s,gotac)
exten => s,n,SetVar(ACCOUNTCODE=benshaw)
exten => s,n(gotac),SetAccount(${ACCOUNTCODE})
exten => s,n,GotoIf($[${LEN(${ARG1})} = 10]?s,add1)
exten => s,n,Dial(IAX2/USER at nufone/${ARG1},,g)
exten => s,n,NoOp(NUFONE: HANGUPCAUSE is ${HANGUPCAUSE} and DIALSTATUS is 
${DIALSTATUS})
exten => s,n,Goto(dial-${DIALSTATUS},1)
exten => s,n(add1),Dial(IAX2/USER at nufone/1${ARG1},,g)
exten => s,n,NoOp(NUFONE: HANGUPCAUSE is ${HANGUPCAUSE} and DIALSTATUS is 
${DIALSTATUS})
exten => s,n,Goto(dial-${DIALSTATUS},1)

exten => dial-CANCEL,1,Hangup
exten => dial-ANSWER,1,Hangup
exten => dial-NOANSWER,1,Hangup
exten => dial-BUSY,1,Busy
exten => dial-CONGESTION,1,Macro(pri-dial,${ARG1},${ARG2})
exten => dial-CHANUNAVAIL,1,Macro(pri-dial,${ARG1},${ARG2})

; handle NXX-NXX-XXXX, 1-NXX-NXX-XXXX and 011...
[nufone]
exten => _NXXNXXXXXX,1,Macro(nufone-dial,${EXTEN})
exten => _1NXXNXXXXXX,1,Macro(nufone-dial,${EXTEN:1})
exten => _011.,1,Macro(nufone-dial,${EXTEN})

You can ignore the accountcode stuff, we handle calls for several businesses 
so I sort the accounting out that way.  

For contexts that I want to have calls go out to Nufone I include the 'nufone' 
context.  As you can see, it handles 10-digit, 11-digit and international 
(variable-digit) extensions.

Basically if it's a 10-digit #, add a '1' to it.  Then attempt to Dial() 
through my Nufone account.  You'll notice the 'g' flag to the Dial() 
application which tells it to go on in context after a hangup.  I then check 
the status of DIALSTATUS and if the result was CONGESTION or CHANUNAVAIL I 
fall back and dial out my PRI.

Personally I think that CONGESTION should never be returned unless the other 
side SAYS "piss off, I'm too busy to handle your call" but IAX will throw 
back a CONGESTION status if it can't reach the other side, which is why I 
have to check for both CONGESTION and CHANUNAVAIL.

-A.