![[8.5.5.7 or later]](../images/ng_v8557.gif)
Differences between SIP 1.0 and SIP 1.1
There are some key differences between Session Initiation Protocol (SIP) 1.0 and SIP 1.1 in areas such as the deployment descriptor, annotations, and servlet specifications.
Function | SIP 1.0 | SIP 1.1 |
---|---|---|
Deployment descriptor | The deployment descriptor is described by a DTD. | The deployment descriptor is described by an XML schema. Some other changes in the deployment descriptor are:
|
Annotations | No annotations support | Support for annotations that are defined by Java™ EE 5 within SIP servlets and listeners; defines custom annotations that represent SIP
interfaces. You can use annotations for these tasks:
There are 4 supported annotations in SIP 1.1:
|
New in SIP 1.1 servlet specification
SIP 1.1 servlet specification adds some features:
- Introduces a new entity that is called an Application Router
- Sits alongside the SIP Container for routing SIP requests
- Has logic to select which SIP applications to call.
- WebSphere® Application Server provides a default application router. For more information, see the topic on SIP application router in the WebSphere Application Server documentation.
- o The SIP Servlet API was extended to include two new methods:
- doRefer(): forwards request to a third party.
- doUpdate(): updates a session without changing the dialog state.