Dialogic 6.2 ユーザーズマニュアル

Enabling the R2 Protocol

November 2009

358

An outbound call request sequence that results in call rejection by 

the remote side is illustrated in 

. 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.

(1) L4L3mCALL_REQUEST

Host

(2) L3L4mCLEAR_REQUEST