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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
SAI CCM OOBINFO RE
Q
MGA
BCM
H3A
RTP Cut thru (H323 fast start)
N
TFY (fxr / t38(start))
Service feature Ind
(
fax-start
)
H245 Re
q
uest mode
(
t38
)
CNM API
RemoteModifyCL_ex (in active)
MDCX (inactive)
CNM API
RemoteModifyCL_ex (send recv, t.38
SDP)
MD
C
X
(
L
:
a:
im
age/t38,
Se
n
d
R
ecv
ACK/NACK
CNM API
p
repareResponse (ACK/NACK)
Fax transmission starts
N
TFY (fxr / t38(stop))
Service feature Ind
(
fax-sto
p)
Service feature Re
q(
fax-sto
p)
RQNT (fxr / t38())
Normal Call release
CRCX(PCMU, t38)
CNM API
EstablishCx_ex (PCMU, T38 )
Service feature Re
q(
fax-start
)
ÍÎ Fax information exchange