Dialogic 6.2 Manuale Utente

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.

(1) L4L3mCALL_REQUEST

Host

(3) L3L4mCONNECT

(2) L3L4mALERTING