A temporary problem with SIP servlet invocation exist in such way that a dummy deployment descriptor web.xml has to be present alongside with the sip.xml for each deployed SIP servlet. Unless present the servlet will not be invoked regardless of rules present in the sip.xml. These files will have to coexist in WEB-INF directory.

Here's an example web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
        <display-name>temporary_fix</display-name>     
    <description>temporary_fix</description>     
</web-app>