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Asterisk Tutorial 13 - Asterisk Variables

Asterisk Tutorial 13 - Asterisk Variables

Introducing Asterisk Phone Systems – Asterisk Variables

Today, we show you how to dial any length of number.

Building on from last time when we introduced the topic of Regular Expressions within Asterisk, this time we demonstrate how to use Asterisk Variables to be able to store dialled numbers within your dialplans. Beyond that, we also show you how using variables and expressions combined, you can script your dialplan to be able to call any number, regardless how long it is and manipulate how the number is recorded in the Asterisk CLI.

You can configure variables within Asterisk by using the following format:


For the purposes of today’s tutorial, we have used the EXTEN variable which if you’ve ever wanted to know how to store the number you actually dialled within your dialplan – here is your answer. EXTEN is one of the most common Asterisk Variables, but for more variables, please visit

Another useful tool when using variables is the ability to manipulate them. In our tutorial, we showed you how to configure your variable so that the offset (point at which you jump into the string) and string length, which can be done using


This will enable you to record only the most important dialled numbers within your dialplan. For example, eliminating the 0 for selecting the outside line or by using the minus (-) symbol to start your offset from the end of the string.

Once you have tested your variables, you can then clean up your outgoing context dialplan by using a regular expression


to be able to dial any number.

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Final Word

A well-configured business phone system that oozes useful tools, delivers excellent audio quality and intuitive call flows will leave callers with a highly professional impression. The configuration options and application availability and how well they are utilized will have a decisive impact on how professionally you manage your calls and therefore how your customers view your company. The switch to a pascom VoIP phone system solution provides the opportunity to not only upgrade your internal collaboration but also to redefine telephony in your company.

If you would like more information regarding pascom and our Asterisk based Software PBX, please visit our website or give the pascom team a call on +49 991 29691 0 to discuss your requirements and get started within minutes using our free hosted business VoIP phone system edition.

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Philipp Meixner, CEO
As a communications agency with just under 20 employees, the pascom phone system is perfect for us. The technical concept simply functions, which is what you want. The service is exceptional and always accessible (even if it is rarely needed) and as one of the agency’s business partners, we can only recommend pascom: open, straight forward, pleasant to work with - great. Thank you pascom!

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Lars Hoeger, IT Director
When we make decisions regarding new systems, we want to make sure that we have both reins firmly in our hands. Therefore, it is essential to implement systems which adhere to OpenStandards, allowing us to seamlessly connect and integrate these to our existing systems. In addition, we require reliable suppliers, who are ready to customise their solutions to our requirements, which is why we chose pascom who offer exactly this service and more.

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Kassandra Martin, Deputy Director & Reception Manager
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Wake & Camp Ruhlsdorf

Markus Gerlitzki, Managing Director
My team and I pride ourselves on the level of excellent care we provide our guests. However, it can be distracting when the phone is always ringing and we constantly answer the same questions. Thanks to the pascom phone system, we have been able to setup an automated self-service hotline which allows guests to quickly get answers and if required callers can be quickly and efficiently routed to an an employee. The system greatly improves customer service with around the clock answers around opening times and courses and therefore reduces the strain on employees, ensuring we are free to cater to the needs of our on-site guests.

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