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Global Call IP Technology Guide — November 2007 357
Dialogic Corporation
Third Party Call Control (3PCC) Operations and Multimedia Support
Figure 69. Basic Third Party Call Control Establishment (part two)
Application A
Global Call
Library A
(IPCCLIB)
Application B
Global Call
Library B
(IPCCLIB)
Global Call
Library C
(IPCCLIB)
Application C
IPML
Library A
IPML
Library C
re-INVITE
SDP Offer 2
GCEV_REQ
MODIFY_CALL
SDP Offer 2
ipm_ModifyMedia
(TxRx)
IPMEV_MODIFY
_MEDIA
gc_AcceptModifyCall
SDP Answer 2
200 OK
SDP Answer 2
GCEV_MODIFY
_CALL_ACK
SDP Answer 2
GCEV_SIP_200OK
gc_SipAck
SDP Answer 2
GCEV_SIP_ACK_OK
gc_SipAck
ipm_ModifyMedia
(TxRx)
IPMEV_MODIFY
_MEDIA
ACK
No SDP
GCEV_SIP_ACK_OK
GCEV_ACCEPT
_MODIFY_CALL
RTP
ACK
SDP Answer 2
GCEV_ANSWERED
SDP Answer 2
GCEV_SIP_ACK
RTP
GCEV_SIP_ACK
no SDP