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Global Call IP Technology Guide — November 2007 359
Dialogic Corporation
Third Party Call Control (3PCC) Operations and Multimedia Support
Figure 70. Alternate Third Party Call Control Establishment (part one)
Application A
Global Call
Library A
(IPCCLIB)
Application B
Global Call
Library B
(IPCCLIB)
IPML
Library B
Global Call
Library C
(IPCCLIB)
IPML
Library A
IPML
Library C
Application C
gc_MakeCall
SDP Offer 1
GCEV_DIALING
INVITE
SDP 1
ipm_StartMedia
(Tx/Rx)
GCEV_OFFERED
SDP Offer 1
IPMEV_START_MEDIA
RTP
gc_SetUserInfo
SDP Answer 1
gc_AcceptCall
GCEV_ACCEPT
180 Ringing
SDP Answer 1
GCEV_ALERTING
SDP Answer 1
ipm_ModifyMedia
(TxRx)
RTP
IPMEV_MODIFY
_MEDIA
gc_AnswerCall
200 OK
SDP Answer 1
GCEV_CONNECTED
GCEV_SIP_200OK
gc_SipAck
ACK
GCEV_SIP_ACK_OK
GCEV_ANSWERED
GCEV_SIP_ACK
continued in
Alternate Third Party Call Control Establishment (part two)
figure
SDP added by the application
in a provisional response
will be automatically included
in the dialog's final response.
The repeated SDP will be delivered
to the application once.