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Appendix A - Call Control Scenarios
379
Application Device Driver State Firmware Network
CCEV_PROCEEDING
(if requested not
masked)
<--
DIALING *B channel cut
thru
CALL_PROCEEDING
<--
Proceeding
<--
CCEV_PROGRESSING
(if requested not
masked)
<--
PI=1
(interworking
with a non-ISDN
has occurred
within the
network)
CALL_PROGRESS
<--
Progress
<--
CCEV_PROGRESSING
(if requested not
masked)
<--
PI=2 (the
destination user
is not ISDN )
CALL_PROGRESS
<--
Progress
<--
Application may
assign a voice
resource to
detect the in-
band tone
CCEV_PROGRESSING
(if requested not
masked)
<--
PI=8 (in-band
information is
now available)
CALL_PROGRESS
<--
Progress
<--
CCEV_ALERTING
(if requested not
masked)
<--
ALERTING CALL_ALERT
<--
Alerting
option
<--
CCEV_CONNECTED
<--
CONNECTED CALL_CONNECT
<--
Connect
<--
* Application may connect a voice channel to the B channel.