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Enabling the R2 Protocol
November 2009 358
An outbound call request sequence that results in call rejection by
the remote side is illustrated in Figure 54. In this case, BSMI
determines that the call has been rejected during inter-register
signaling and automatically clears the call request. BSMI then
provides the Host indication of the failed call attempt with the
L3L4mCLEAR_REQUEST message. As in the case of call
acceptance, this message contains the IISDN_R2_CALL_STATUS
structure that is examined to determine the precise reason for call
failure. Normally, the call has been rejected by the remote side and a
status code of IISDNR2statGROUP_B_AVAILABLE is indicated
with the associated Group B reason for the rejection. However, other
failures are possible during abnormal operation and are indicated by
other values in enumeration IISDN_R2_CALL_STATUS_CODES.
Figure 54. Outbound Call Rejected
(1) L4L3mCALL_REQUEST
Host
(2) L3L4mCLEAR_REQUEST