The module does specific handling for notify-subscribe message-summary (message waiting indication) events as specified in RFC 3842. It is used with the general event handling module, presence. It constructs and adds message-summary event to it.
The module does not currently implement any authorization rules. It assumes that publish requests are only issued by a voicemail application and subscribe requests only by the owner of voicemail box. Authorization can thus be easily done by OpenSER configuration file before calling handle_publish() and handle_subscribe() functions.
The module implements a simple check of content type application/simple-message-summary: Content must start with Messages-Waiting status line followed by zero or more lines that consist of tabs and printable ASCII characters.
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