how to implement SIP protocol?

Hi thereI just wanna know how to implement SIP protocol?Do I have API for it?I want to develop and instant messaging service.ThxVarun
[175 byte] By [sooda] at [2007-10-1 13:45:37]
# 1
There may be an RFC for it.-- iasyas
yasiasa at 2007-7-10 16:52:25 > top of Java-index,Other Topics,Java Community Process (JCP) Program...
# 2
There is a RFC 3261 and to implement this RFC JAIN SIP API is required.it is open source and u can download from java.sun.com.regardssudhir
SreenathKulkarnia at 2007-7-10 16:52:25 > top of Java-index,Other Topics,Java Community Process (JCP) Program...