The following SIP application listeners, in package javax.servlet.sip, are available to SIP servlet developers:
Table 1–11 SIP Application Listeners| 
 Listener  | 
 Description  | 
|---|---|
| 
 SipApplicationSessionListener  | 
 Implementations of SipApplicationSessionListener receive notifications when SipApplicationSession instances have been created, destroyed, timed out, or are ready to be invalidated. See the SIP Servlet 1.1 Javadocs for more information.  | 
| 
 SipApplicationSessionAttributeListener  | 
 Implementations of SipApplicationSessionAttributeListener receive notifications when attributes are added, removed, or modified in SipApplicationSession instances. See the SIP Servlet 1.1 Javadocs for more information.  | 
| 
 SipApplicationSessionBindingListener  | 
 Session attributes that implement SipApplicationSessionBindingListener receive notifications when they are bound or unbound to SipApplicationSession instances. See the SIP Servlet 1.1 Javadocs for more information.  | 
| 
 SipApplicationSessionActivationListener  | 
 Implementations of SipApplicationSessionActivationListener receive notifications when SipApplicationSession instances are activated or passivated. See the SIP Servlet 1.1 Javadocs for more information.  |