
Cisco BTS 10200 Softswitch T.38 Fax Relay
External Interfaces
9
Cisco BTS 10200 Softswitch T.38 Fax Relay Support
Call Flow
The following call flow diagram (Figure 1) illustrates the interactions between the Cisco BTS 10200
Softswitch software modules for the CA-controlled T.38 Fax Relay implementation.
Figure 1 CA-Controlled T.38 Fax Relay
MGA
H3A
RTP Cut thru (H323 fast start)
TFY (fxr / t38(start))
Service feature Ind
fax-start
H245 Re
uest mode
t38
CNM API
RemoteModifyCL_ex (in active)
MDCX (inactive)
CNM API
RemoteModifyCL_ex (send recv, t.38
SDP)
MD
X
L
im
n
R
CNM API
repareResponse (ACK/NACK)
TFY (fxr / t38(stop))
Service feature Ind
fax-sto
Service feature Re
fax-sto
RQNT (fxr / t38())
CRCX(PCMU, t38)
CNM API
EstablishCx_ex (PCMU, T38 )
Service feature Re
fax-start
ÍÎ Fax information exchange
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