Variables for Copying Data between Messages

You can use variables in SIP message manipulation rules to copy specific information (data) from one message to another. Information from one message is copied to a variable and then information from that variable is copied to any subsequent message. The device can store information in local (call) or global variables.

To store data in a variable, add the name of the variable in the 'Action Subject' field and set the 'Action Type' to Modify. To retrieve data from a variable, add it in the 'Action Value' field, or use it as a condition value in the 'Condition' field.

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By default, the variable types described in this section support the following maximum number of variables per entity (e.g., a specific call):

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15 variables for Mediant Software with 8 GB of memory or higher.

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10 variables for all other devices.

You can configure this maximum number of variables, using the [MMSubVariables] ini file parameter (range 1 to 25).

For each variable type per entity, all the used variables together can contain up to 1,500 characters.

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Variable names can include alphanumeric characters and hyphens (-).

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Variable values can be any string.