Filter
Top Products
98 Dialogic
®
Global Call IP Technology Guide — November 2007
Dialogic Corporation
IP Call Scenarios
3.4.1 Sending T.38 Fax in an Established Audio Session
In this scenario, the user application uses the Dialogic
®
Global Call API to open a Media device,
configures “Manual” mode of operation and establishes an audio session with the remote device.
See Section 4.26.2, “Specifying Manual Operating Mode”, on page 322 for more information on
manual mode. A T.38 Fax device is then opened and the application switches from an audio session
to a T.38 session.
When the application receives notification that the T.38 session is ready, fax information can be
sent. Figure 40 shows the scenario diagram.
Note: The application must not use both Dialogic
®
Global Call API and Dialogic
®
IP Media Library API
functions on the same device. The Dialogic
®
IP Media Library API calls (ipm_) in Figure 40 are
shown for informational purposes only. Global Call interacts with the IP Media Library on behalf
of the application.
Figure 40. Sending T.38 Fax in an Established Audio Session
IPML
Remote Device Capable of
Signaling, Audio and T.38
App
gc_OpenEx(:N_iptB1T1:M_ipmB1C1)
SETUP with TCS/INVITE to send Origination IP
address and RTP Port number
Call Connected
FAX
fx_open(dxxxB23C1)
dev_Connect(ipmB1C1, dxxxB23C1)
REINVITE/RequestMode to switch to T.38 Fax. Send local
UDP port and IP Address
200OK/RequestMode Ack
Ipm_StartMedia()
Send UDP port number and IP address to
the firmware
Stop the RTP streaming.
Audio Data
Fx_sndfax()
T.38 Data via RTP
GC/cclib
gc_MakeCall()
GCEV_CONNECTED
GCEV_EXTENSION (IPSET_SWITCH_CODEC,IPPARM_READY)
IPVSC/IPML forwards
ipm_StartMedia() to T.38
device based on the
information fro
dev_Connect()
Ipm_GetLocalMedia()
gc_SetUserInfo(IPSET_FOIP,IPPARM_T38_CONNECT)
gc_SetConfigData(IP_MANUAL_MODE)
gc_Extension(IPSET_SWITCH_CODEC,IPPARM_T38_INITIATE)
Ipm_Stop()
gc_UnListen()
GCEV_EXTENSIONCMPLT