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Download at Boykma.Com Download at Boykma.Com The Dialplan The dialplan is the rout ing core of an Asterisk server. Its sole role is to look at what is dialed, and route the call to its destination. This is the core of any telephony system and Asterisk is no different.

The dialplan is made up of three elements extensions, contexts, and priorities. An extension is number or pattern that the dialed number is to be matched against and a context is a collection of extensions (and possibly other included contexts too). Each extension will have one or more priorities, each of which appear on a separate line, and the priority sequence always starts with the priority "1".

If you have read Building Telephony Systems with Asterisk, you will know how to use extensions, priorities, contexts, and included contexts to handle incoming and outgoing calls as well as to set up features such as: Call Queues Call Parking Direct Inward Dialling Voicemail Automated Phone Directory Conference Rooms. In this chapter, we will VS .NET pdf417 build on this knowledge by looking at: Significant updates since Asterisk 1.2 Pattern ordering within and between contexts Extending the dialplan with variables The DEVSTATE() function The SYSTEM application.

Download at Boykma.Com The Dialplan We will then use this kn owledge to provide examples of: Advanced call routing with the DEVSTATE() function Call routing based on the time of the day Using multiple ADSL lines within Asterisk to boost call capacity. The dialplan is primaril .net framework PDF 417 y defined in the extensions.conf file.

This can also include additional files that are added into it using the #include directive. For instance, systems using the FreePBX GUI will have extensions_additional.conf, extensions_custom.

conf, and extensions_override_freepbx.conf as standard files, which have been added using #include into the extensions.conf file.

We must also remain aware of files such as the features.conf file, as they also include numbers that can be dialed such as codes for Pickup and Call Parking, and so form part of the dialplan. A list of standard and optional Asterisk configuration files can be found at http://www.

Dialplan location Extensions and contexts Being familiar with Aste risk, you will have a good working understanding of extensions and contexts already. They are, of course, the very heartbeat of Asterisk, and as such they are probably subject to the most change from version to version, as Asterisk evolves to cater for new hardware, software, and more complex working practices. So let"s have a quick review of extensions and contexts, pointing out significant changes in versions 1.

4 and 1.6, before we proceed to the more advanced techniques and uses..

Pattern matching Within the dialplan, mat ching can be either direct or partial against a pattern. Normally in a PBX, these patterns are numeric. But with Asterisk, they can also be alphanumeric or even just alpha.

For example 2000, DID01234123456, and Main_number are all valid extensions. As very few phones contain alphabetic keys, the last two are typically only used for incoming DID channels. For the majority of this chapter, we will stick to numeric patterns.

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