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Download at Boykma.Com generate, create pdf 417 none with .net projects MS Word Call Routing with Asterisk 5. If number star ts 0207, route via PSTN. 6.

If number starts 0208, route via PSTN. 7. If number starts 0, route via ITSP A.

8. Otherwise, route via PSTN. As local numbers without a dial code are the most difficult to match against a mask, it is easiest to match everything else first and leave the local numbers without a dial code to be rounded up in the "catch-all" at the end.

Hence, in order to implement the rules described above, using macros for code clarity, we should end up with something along the following lines in the extensions.conf file:. ; ; Send emergenc visual .net pdf417 y numbers to PSTN exten => _999,1,Macro(out-PSTN,${EXTEN}) exten => _911,1,Macro(out-PSTN,${EXTEN}) exten => _112,1,Macro(out-PSTN,${EXTEN}) ; ; Send numbers starting 07 to mobile exten => _07.,1,Macro(out-GSM,${EXTEN}) ; ; Send numbers starting 001 to Provider B exten => _001.

,1,Macro(out-prov-b,${EXTEN}) ; ; Send numbers starting 00 to Provider C exten => _00.,1,Macro(out-prov-c,${EXTEN}) ; ; Send numbers starting 0207 or 0208 to PSTN exten => _0207.,1,Macro(out-PSTN,${EXTEN}) exten => _0208.

,1,Macro(out-PSTN,${EXTEN}) ; ; Send numbers starting 0 to Provider A exten => _0.,1,Macro(out-prov-a,${EXTEN}) ; ; Send anything else to PSTN exten => _X.,1,Macro(out-PSTN,${EXTEN}) ;.

[ 68 ]. Download at Boykma.Com 3 . Note that in the barcode pdf417 for .NET final "catch all" line, we don"t simply use the pattern "_." as it matches everything, even the Asterisk special extensions like s, t, i, h, and so on.

It is better to use the pattern _X. that will match on any two (or more) character dial-string, so long as the first character is a number between 0 and 9. You can, of course, implement more intelligent pattern matching for this code if so required.

The use of standard macros to handle each outbound route is recommended, though, so that you do not have to duplicate code for each rule. The process for failing over to another channel is to use the DIALSTATUS variable, as per the example below, which shows the possible contents of the out-PSTN macro mentioned above. A return value of CHANUNAVAIL indicates that the channel cannot process the call and so you should failover to another channel.

. exten => s,1,D ial(${ZAP/1/${ARG1},,T) exten => s,n,NoOp( Dial Status: ${DIALSTATUS}) exten => s,n,Goto(s-${DIALSTATUS},1) exten exten exten exten exten exten => => => => => => s-NOANSWER,1,Hangup s-CONGESTION,1,Congestion s-CANCEL,1,Hangup s-BUSY,1,Busy s-CHANUNAVAIL,1,SetCallerId(${CALLERIDNUM}) s-CHANUNAVAIL,2,Dial(SIP/sippeer/${LOCALAREACODE}${ARG1},,T). In this code, the PDF417 for .NET call is attempted via the PSTN initially, but if that channel is unavailable then the call is routed through a SIP channel instead. As we can see it is a relatively simple process, but as already intimated, proper use can result in a very resilient and frugal call routing strategy.

You could, of course, implement the failover strategy as a standard macro in its own right if your customer is happy to have all failovers handled in the same way. For example, regardless of which channel is tried first, failover to ITSP Provider A, followed by ITSP Provider B, followed by PSTN, followed by GSM gateway. It is easier to maintain than a separate failover section for each outbound route, but could potentially cost the customer a little extra over time.

However, having a separate failover strategy for each outbound route is not very onerous to maintain and usually makes sense for the customer.. [ 69 ]. Download at Boykma.Com Call Routing with Asterisk Summary. Devising a routin g strategy for your customer first requires that you understand in some depth their current call patterns (local, national, international, mobile/cell, and so on), and the options available in the local market for PSTN, mobile/cell, and VoIP traffic. Only then can you devise a plan for an Asterisk-based system that will ensure quality and value-for-money. It may also be that a customer with multiple sites needs to implement or upgrade the WAN as part of the implementation, as well as consider carefully whether they should have a single central PBX, or multiple smaller ones.

Once all this information is known, strategies should be devised for local calls, national calls, international calls, and calls to mobiles/cell-phones. A primary route for each should be chosen, with failover to alternative routes in place to ensure that calls can always be made. This can be implemented in a clear and effective manner through the use of macros in the dialplan.

Use of ENUM and/or DUNDi should also be considered as a means of routing external calls via the Internet to avoid charges from telephony providers (including VoIP providers). Both ENUM and DUNDi are means of advertising Internet-enabled telephone numbers so that other subscribers can set up a direct link between PBXs..

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