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Global Call IP Technology Guide — November 2007 369
Dialogic Corporation
Third Party Call Control (3PCC) Operations and Multimedia Support
5.4.7.1 OPTIONS Request Without a MIME Body
When performing SIP OPTIONS transactions in 3PCC mode, SDP content is always delivered in a
parameter block attached to the Global Call event as an IPSET_SDP /
IPPARAM_OPTION_ANSWER or IPSET_SDP / IPPARM_OPTION_OFFER parameter element
regardless of MIME body inclusion. This is consistent with connection establishment SDP
behavior in this mode, except that there is no offer/answer protocol enforcement in OPTIONS
transactions. Offer/answer protocol enforcement applies to media connection establishment
transactions.
When performing SIP OPTIONS transitions in 1PCC mode, the SDP information is delivered to
the application in the parameter block attached to the Global Call event as an IPSET_MIME /
IPPARM_MIME_PART_BODY parameter element regardless of MIME body inclusion.
Refer to Section 4.14, “Sending and Receiving SIP OPTIONS Messages”, on page 210 for more
information about enabling OPTIONS access
Figure 78 depicts the host application behavior when performing an OPTIONS request on an active
dialog. A MIME body is not attached in Figure 78: