Applications that operate on wireless networks may want to limit the size of SIP headers to reduce the size of messages and conserve bandwidth. Java Specification Request (JSR) 359 provides the SipServletMessage.setHeaderForm() method, which enables application developers to set a long or compact format for the value of a given header.

One feature of the SipServletMessage application program interface (API) provided in JSR 359 is the ability to set long or compact header formats for the entire SIP message using the setHeaderForm method.

In addition to SipServletMessage, Converged Application Server provides a container-wide configuration parameter that can control SIP header formats for all system-generated headers. This system-wide parameter can be used along with SipServletMessage.setHeaderForm and SipServletMessage.setHeader to further customize header formats.