1. MD5 - this function allows you to calculate MD5 checksum on a string.
NOTE:Information about the Asterisk functions could be obtained by typing the show functions command.
Information about a particular function could be obtained by typing the show function <function name> on the Asterisk CLI command.
NOTE: In Asterisk versions 1.2 and up there are several applications which are mark as deprecated and which are no longer supported.
These applications will now become functions and these functions will be used in combination with the Set application.
You have to know that their functionality will be the same, but with a different syntax.
The MD5 function is one of those new functions which will replace the old applications. In this tutorial we will show you its syntax and possible usage.
var - The variable, where the returned result will be stored. The result will be the calculated checksum on the string set as parameter of the MD5 function string - the system will calculate the checksum on this string.
Purpose and usage
The purpose of this function is to calculate MD5 checksum on a string.
To see how the application works we recommend you to use our IAX softphone Idefisk. You could download it from here. Please also read our tutorial to learn how to configure it to work with Asterisk PBX.
Asterisk PBX configurations
iax.conf Configurations
We need to create one user in the iax.conf file. This is because we are going to use the IAX2 protocol. If you want to use other protocol, such as SIP or MGCP, you have to do the configurations below respectively in sip.conf or mgcp.conf.
So, we have registered the user user1
Type=friend means that this user can make and receive calls. Host=dynamic means that the IP is not static but dynamic through a DHCP server. Allow=all means that the line which this user will use, could support all audio codecs. Context=test - this shows that this user is working with the extensions in this context of the configuration file extensions.conf.
On the picture above you could see our extensions.conf file.
In this example, when somebody dials 100, the call will be answered by the Answer application.
Then we will calculate the checksum on the word test through the MD5() function.
So the next executed extension will be the one, which contains the Set application. As arguments in its brackets we have set the following - NEWVAR=${MD5(test)}.
This will cause the calculation of the checksum for the word test.
We will use extension with the NoOp application - to check the result. Call the variable ${NEWVAR} in the application brackets.
NOTE: The function MD5() is case sensitive. You always have to write it with capital letters.
In order to be sure that the Asterisk PBX will hang up the line, when the conversation is over, it is a good idea to use the Hangup application.
2. Screenshots of what you could see on the CLI of the Asterisk PBX
3. Additional information
For more information about extensions.conf you can check here.
For more information about iax.conf you can check here.
This application is tested with our IAX softphone Idefisk. You can download it from here. For more information about this softphone please read our tutorial.
If you would like to test this application with the SIP channel you can read our tutorials about the SIP Softphones to learn how to configure them to work with Asterisk PBX