The Cisco 79XX Phones include a mini-browser that allows the phone to interact with specially designed web services. These services can be developed as a CGI script on an HTTP server which outputs content using the XML syntax.
A phone operator presses the "Services" button to access a menu of available services. Using the numeric key pad or the up/down button, a service is selected. The phone will then contact Apache or IIS to download an XML document which can contain the description of an object.
For your second question,yes,cisco provides a number of sample services for deployment and for development purposes.
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