JTAPI is enhanced to model Call events caused by CallManager's REFER and REPLACE features in
the JTAPI call model. JTAPI provides Applications the capability to handle call events caused by
REFER and REPLACE features. JTAPI does not provide any interface for Appliations to initiate
REFER or REFER/INVITE with REPLACES requests; however, it is able to handle the call events
properly.
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/jtapi_dev/5_0_4/jtdev.pdf