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364 Dialogic
®
Global Call IP Technology Guide — November 2007
Dialogic Corporation
Third Party Call Control (3PCC) Operations and Multimedia Support
Figure 74. Successfully Modifying the Coder (part two)
IPML
Library A
Application A
Global Call
Library A
(IPCCLIB)
Application B
Global Call
Library B
(IPCCLIB)
IPML
Library B
gc AcceptModifyCall
SDP Answer 2
200 OK
SDP Answer 2
GCEV_MODIFY
_CALL_ACK
SDP Answer 2
RTP
GCEV_SIP_200OK
ipm_ModifyMedia
(Tx/Rx)
IPMEV_MODIFY
_MEDIA
gc_SipAck
ACK
GCEV_SIP_ACK_OK
GCEV_ACCEPT
_MODIFY_CALL
GCEV_SIP_ACK
If the application executes ipm_ModifyMedia( )
when the re-INVITE is transmitted or when the
GCEV_MODIFY_CALL_ACKis received,
there will alway be a short media drop.
This is a limitation in the IPML library.