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370 Dialogic
®
Global Call IP Technology Guide — November 2007
Dialogic Corporation
Third Party Call Control (3PCC) Operations and Multimedia Support
Figure 78. OPTIONS Request without a MIME Body
5.4.7.2 With a MIME Body
Figure 79 depicts the host application behavior when performing an OPTIONS request on an active
dialog with the OPTIONS access enabled and a MIME body attached:
Application A
Global Call
Library A
(IPCCLIB)
Global Call
Library B
(IPCCLIB)
Application B
gc_Extension
MSG_TYPE_SIP
_OPTIONS
OPTIONS
GCEV_EXTENSION
MSG_TYPE_SIP
_OPTIONS
gc_Extension
MSG_TYPE_SIP
_OPTIONS_OK
IPSET_SDP
GCEV_
EXTENSIONCMPLT
200 OK
SDP Capabilities1
GCEV
_EXTENSIONCMPLT
GCEV_EXTENSION
MSG_TYPE_SIP
_OPTIONS
IPSET_SDP
A GCEV_SIP_200_OK event
is not sent to the application
when a 200 OK is received
on an OPTIONS transaction.
SIP OPTIONS transactions
do not receive an ACK.
In third party call control mode, SDP is included
in the parameter block and attached to the meta-event as
IPSET_SDP/IPPARM_OPTIONS_ANSWER.
Note:
There is no offer/answer protocol
enforcement in OPTIONS transactions.