Dialogic 6.2 - Manual (Page 225)

Managing Calls Using IP Telephony
November 2009 225
Call Progress Values
Brooktrout Bfv API has mapped all possible IP call INVITE
responses to Bfv call progress values. See Table 9 for values for
functions that provide a final call progress value:
Table 9. Mapping of SIP responses to Bfv FCP values
SIP
response
code Bfv final call Progress code
486 Busy here FCP_BUSY1
600 Busy everywhere FCP_ROBUSY
503 Service Unavailable FCP_SITINTC
180 Ringing FCP_RING1
200 OK (when in response to an INVITE
when SDP media type and subtypes are
image and T.38 respectively.)
FCP_ANSWER_TONE_DETECT