Reference Turnkey Applications Tutorials Visual Designer
Reference Turnkey Applications Tutorials Visual Designer
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docs 1.0
  • docs
    • 1.0
  • docs
  • Accessing custom SIP headers from an RCML or Visual Designer application

Accessing custom SIP headers from an RCML or Visual Designer application

CPaaS provides an additional interface to communicate with an RCML/Visual Designer application by means of custom SIP headers. The idea is that all custom SIP headers in a SIP message are detected and converted to HTTP parameters in the request to the RCML application using a convention. The RCML application can consume this parameters. Furthermore, Visual Designer converts these parameters to RVD variables and makes them available to its modules.

RCML applications

The following conventions are followed:

  • Any SIP header starting with X- prefix is custom.

  • HTTP parameters are created out of each custom SIP header by adding the SipHeader_ prefix to its name.

Example mappings from SIP header names to HTTP parameter names:

X-My-Header -> SipHeader_X-My-Header

Thus the SipHeader_X-My-Header will be available as typical GET or POST parameter in the RCML application.

Visual Designer applications

Visual Designer will take the previous convention one step further and create a Visual Designer variable out of the parameter. Thus, the mapping from a custom SIP header to an Visual Designer variable will be the following:

X-My-Header -> $core_x_my_header

So, if X-My-Header SIP header arrives at CPaaS, Visual Designer will have a variable named $core_x_my_header available in its modules. Note the following:

  • All characters are converted to lower case. This happens because although SIP headers are  not case insesitive while Visual Designer variables are.

  • All non alpha numeric characters i.e. [^A-Za-z0-9_],  are converted to `_'  (underscore). That happens because Visual Designer has some additional restrictions for naming variables. Here is the regular expression that is used for invalid characters to underscore:

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