Glare (Call Collision)

The glare condition occurs when both an incoming and outgoing call requests the same time slot. The following scenario illustrates a glare condition where priority is given to the incoming call.

Application	Libgcs7	State	Stack	Network
gc_MakeCall( ) -->	CRN # 1 assigned IAM -->	NULL	IAM -->	IAM -->
	GCEV_DISCONNECTED for CRN # 1 <--	1 DISCONNECTED	IAM <--	IAM <--
	CRN # 2 assigned GCEV_OFFERED 2 <--	2 OFFERED
gc_DropCall(1) -->
	GCEV_DROPCALL 1 <--	1 IDLE
gc_AcceptCall(2) (optional) -->	ACM -->		ACM -->	ACM -->
	GCEV_ACCEPT 2 <--	2 ACCEPTED
gc_ReleaseCallEx(1)*	CRN #1 released	1 NULL
gc_AnswerCallEx(2) -->	ANM -->		ANM -->	ANM -->
	GCEV_ANSWERED 2 <--	2 CONNECTED
Note: * = gc_ReleaseCallEx() is done upon reception of GCEV_DROPCALL

As indicated in Section 5.2, Handling of Glare Conditions, the application must be ready to receive events for two different CRNs. However, for the CRN corresponding to the failed outgoing call, the application only has to respond to the GCEV_DROPCALL event by calling gc_ReleaseCallEx( ). It does not really have to handle two calls. Indeed it is first notified that call is disconnected.

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