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Enabling the R2 Protocol
November 2009 357
Call acceptance by the remote end is determined by BSMI during
MFC inter-register signaling. At this point, BSMI issues an
L3L4mALERTING message to the Host containing the IISDN_R2_
CALL_STATUS structure. The structure element
l34msg.data.al_con_data.r2_call_status.call_status,
provides indication (IISDN_R2_CALL_STATUS_CODES) of
whether the inbound side provided a Group B line condition
(IISDNR2statGROUP_B_AVAILABLE), or whether the call was
accepted without such indication (IISDNR2statGROUP_A_CALL_
ACCEPTED). In the case of the former, element
l34msg.data.al_con_data.r2_call_status.group_B
indicates the Group B call acceptance code.
When the inbound side answers the call, BSMI issues an
L3L4mCONNECT message to the Host.
Figure 53. Outbound Call Accepted
(1) L4L3mCALL_REQUEST
Host
(3) L3L4mCONNECT
(2) L3L4mALERTING