Holding, Transferring, and Conferencing

The call models here show the functions and events related to placing calls on hold, transferring calls, and creating conference calls.

Hold/Retrieve Function, Consulted Party Answers

The following graphic and table describe the hold/retrieve function, when the consulted party answers.

Hold/Retrieve Function, Consulted Party Answers

PARTY A	PARTY B	PARTY C
Call-Establishing Phase (ConnID 1)
	Hold (THoldCall)
	EventHeld ConnID 1 ThisDN B OtherDN A
	Make Call to C (Consultation) (TMakeCall)
Call-Establishing Phase (ConnID 2)
Release Phase (ConnID 2)
	Retrieve Call from A (TRetrieveCall)
	EventRetrieveda ConnID 1 ThisDN B OtherDN A CallState OK
Release Phase (ConnID 1)

^a With EventRetrieved, the values for attributes ThisDNRole and ThisQueue are the same as those for the attributes of the same names, if any, in the events preceding EventRetrieved (EventEstablished and EvenRinging). For non-ACD calls, however, ThisQueue is not reported.

Abnormal Call Flow

Interruption Point	PARTY A	PARTY B
*	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK
**	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK
***	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK

Hold/Retrieve Function, Consulted Party Does Not Answer

The following graphic and table describe the hold/retrieve function, when the consulted party does not answer.

Hold/Retrieve Function, Consulted Party Does Not Answer

PARTY A	PARTY B	PARTY C
Call-Establishing Phase (ConnID 1)
	Hold (THoldCall)
	EventHeld ConnID 1 ThisDN B OtherDN A
Unsuccessful Internal Call (Party Does Not Answer) (ConnID 2)
	Retrieve Call from A (TRetrieveCall)
	EventRetrieveda ConnID 1 ThisDN B OtherDN A CallState OK
Release Phase (ConnID 1)

^a With EventRetrieved, the values for attributes ThisDNRole and ThisQueue are the same as those for the attributes of the same names, if any, in the events preceding EventRetrieved (EventEstablished and EvenRinging). For non-ACD calls, however, ThisQueue is not reported.

Abnormal Call Flow

Interruption Point	PARTY A	PARTY B
*	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK
**	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK

Single-Step Transfer

The following graphic and table describe a single-step transfer.

Single-Step Transfer

PARTY A	PARTY B	PARTY C
Call-Establishing Phase (ConnID 1)
	Single-Step Transfer to C (TSingleStepTransfer)
EventPartyChanged ConnID 1 PreviousConnID 1 ThisDN A OtherDN C ThirdPartyDN B ThirdPartyDNRole TransferredBy CallState Transferred	EventReleased ConnID 1 ThisDN B ThirdPartyDN C OtherDN A CallState Transferred Cause 1stepTransfer	EventRinging ConnID 1 ThisDN C OtherDN A ThirdPartyDN B ThirdPartyDNRole TransferredBy CallState Transferred
		Answer (TAnswerCall)
		EventEstablished ConnID 1 ThisDN C OtherDN A

Abnormal Call Flow

Interruption Point	PARTY A	PARTY B	PARTY C
*	EventReleased ConnID 1 ThisDN A OtherDN C CallState OK
**	EventReleased ConnID 1 ThisDN A OtherDN C CallState OK		EventAbandoned ConnID 1 ThisDN C OtherDN A CallState OK

Single-Step Transfer (Outbound)

The following graphic and table describe a single-step transfer (outbound).

Single-Step Transfer (Outbound)

PARTY A	PARTY B	PARTY C
Call-Establishing Phase (ConnID 1)
	Single-Step Transfer to C (TSingleStepTransfer)
EventPartyChanged ConnID 1 PreviousConnID 1 ThisDN A OtherDN C ThirdPartyDN B ThirdPartyDNRole TransferredBy CallState Transferred EventNetworkReached ConnID 1 ThisDN A OtherDN C *DIAL OtherDNRole Destination *DIAL	EventReleased ConnID 1 ThisDN B ThirdPartyDN C OtherDN A CallState Transferred Cause 1stepTransfer	EventRinging ConnID 1 ThisDN C OtherDN A ThirdPartyDN B ThirdPartyDNRole TransferredBy CallState Transferred
		Answer (TAnswerCall)
		EventEstablished ConnID 1 ThisDN C OtherDN A

Abnormal Call Flow

Interruption Point	PARTY A	PARTY B	PARTY C
*	EventReleased ConnID 1 ThisDN A OtherDN C CallState OK
**	EventReleased ConnID 1 ThisDN A OtherDN C CallState OK		EventAbandoned ConnID 1 ThisDN C OtherDN A CallState OK

Mute Transfer

The following graphic and table describe a mute transfer.

Mute Transfer

PARTY A	PARTY B	PARTY C
Call-Establishing Phase (ConnID 1)
	Mute Transfer to C (TMuteTransfer*)
	EventHeld ConnID 1 ThisDN B OtherDN A
	EventDialing ConnID 2 ThisDN B ThisDNRole Origination OtherDN C OtherDNRole Destination	EventRinging ConnID 2 ThisDN C ThisDNRole Destination OtherDN B OtherDNRole Origination CallState OK
EventPartyChanged ConnID 1 PreviousConnID 1 ThisDN A OtherDN C ThirdPartyDN B ThirdPartyDNRole TransferredBy CallState Transferred	EventReleased ConnID 1 ThisDN B OtherDN A CallState Transferred EventReleased ConnID 2 ThisDN B ThisDNRole Origination OtherDN C OtherDNRole Destination CallState Transferred	EventPartyChanged ConnID 1 PreviousConnID 2 ThisDN C OtherDN A ThirdPartyDN B ThirdPartyDNRole TransferredBy CallState Transferred
		Answer (TAnswerCall)
		EventEstablished ConnID 1 ThisDN C OtherDN A
Release Phase (ConnID 1)

Abnormal Call Flow

Interruption Point	PARTY A	PARTY B	PARTY C
*	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK
**	EventReleased ConnID 1 ThisDN A OtherDN C CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK EventReleased ConnID 2 ThisDN B OtherDN C CallState OK	EventAbandoned ConnID 2 ThisDN C OtherDN B CallState OK
***	EventReleased ConnID 1 ThisDN B OtherDN C CallState OK		EventAbandoned ConnID 1 ThisDN C OtherDN B CallState OK

Two-Step Transfer: Complete After Consulted Party Answers

The following graphic and table describe a two-step transfer: complete after the consulted party answers.

Two-Step Transfer (Complete After Consulted Party Answers)

PARTY A	PARTY B	PARTY C
Call-Establishing Phase (ConnID 1)
	Hold (TInitiateTransfer*)
	EventHeld ConnID 1 ThisDN B OtherDN A
	Consultation Call to C (TInitiateTransfer Continues)
Call-Establishing Phase (ConnID 2)
	Transfer Held Call to C (TCompleteTransfer)
EventPartyChanged ConnID 1 PreviousConnID 1 ThisDN A OtherDN C ThirdPartyDN B ThirdPartyDNRole TransferredBy CallState Transferred	EventReleased ConnID 1 ThisDN B OtherDN A CallState Transferred EventReleased ConnID 2 ThisDN B OtherDN C CallState Transferred	EventPartyChanged ConnID 1 PreviousConnID 2 ThisDN C OtherDN A ThirdPartyDN B ThirdPartyDNRole TransferredBy CallState Transferred
Release Phase (ConnID 1)

Abnormal Call Flow

Interruption Point	PARTY A	PARTY B	PARTY C
*	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK
**	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK EventReleased ConnID 2 ThisDN B OtherDN C CallState OK	EventAbandoned ConnID 2 ThisDN C OtherDN B CallState OK

Two-Step Transfer: Complete Before Consulted Party Answers (Blind)

The following graphic and table describe a two-step transfer: complete before the consulted party answers (blind).

Two-Step Transfer: Complete Before Consulted Party Answers (Blind)

PARTY A	PARTY B	PARTY C
Call-Establishing Phase (ConnID 1)
	Hold (TInitiateTransfer)
	EventHeld ConnID 1 ThisDN B OtherDN A
	Consultation Call to C (TInitiateTransfer Continues)
	EventDialing ConnID 2 ThisDN B ThisDNRole Origination OtherDN C *DIAL OtherDNRole Destination *DIAL	EventRinging ConnID 2 ThisDN C ThisDNRole Destination OtherDN B OtherDNRole Origination CallState OK
	Transfer Held Call to C (TCompleteTransfer)
EventPartyChanged ConnID 1 PreviousConnID 1 ThisDN A OtherDN C ThirdPartyDN B ThirdPartyDNRole TransferredBy CallState Transferred	EventReleased ConnID 1 ThisDN B OtherDN A CallState Transferred EventReleased ConnID 2 ThisDN B OtherDN C CallState Transferred	EventPartyChanged ConnID 1 PreviousConnID 2 ThisDN C OtherDN A ThirdPartyDN B ThirdPartyDNRole TransferredBy CallState Transferred
		Answer (TAnswerCall)
		EventEstablished ConnID 1 ThisDN C OtherDN A
Release Phase (ConnID 1)

Important

If a call appears on the terminating party after transfer completion, the ConnID field of EventRinging is equal to the connection ID of the original call (ConnID 1), and EventPartyChanged is not generated.

Abnormal Call Flow

Interruption Point	PARTY A	PARTY B	PARTY C
*	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK
**	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK EventReleased ConnID 2 ThisDN B OtherDN C CallState OK	EventAbandoned ConnID 2 ThisDN C OtherDN B CallState OK
***	EventReleased ConnID 1 ThisDN A OtherDN C CallState OK		EventAbandoned ConnID 1 ThisDN C OtherDN A CallState OK

Two-Step Transfer to ACD

Important

Two-step transfer to ACD means that a call is waiting in a queue, and the transfer completed before any ACD agent is available to receive the call.

The following graphic and table describe a two-step transfer to ACD.

Two-Step Transfer to ACD

PARTY A	PARTY B	PARTY C (ACD)	PARTY D
Call-Establishing Phase (ConnID 1)
	Hold (TInitiateTransfer)
	EventHeld ConnID 1 ThisDN B OtherDN A
	Consultation Call to C (TInitiateTransfer Continues)
	EventDialing ConnID 2 ThisDN B OtherDN C *DIAL	EventQueued ConnID 2 ThisDN C ThisQueue C OtherDN B
	Transfer Held Call to C (TCompleteTransfer)
EventPartyChanged ConnID 1 PreviousConnID 1 ThisDN A OtherDN C ThirdPartyDN B ThirdPartyDNRole TransferredBy CallState Transferred	EventReleased ConnID 2 ThisDN B ThisDNRole Origination OtherDN C OtherDNRole Destination CallState Transferred EventReleased ConnID 1 ThisDN B OtherDN A CallState Transferred	EventPartyChanged ConnID 1 PreviousConnID 2 ThisDN C ThisQueue C OtherDN A ThirdPartyDN B ThirdPartyDNRole TransferredBy CallState Transferred
		Diverts Call to D
		EventDiverted ConnID 1 ThisDN C OtherDN A ThirdPartyDN C *OPT ThirdPartyDNRole Destination *OPT	EventRinging ConnID 1 ThisDN D ThisQueue C OtherDN A CallState OK
			Answer (TAnswerCall)
			EventEstablished ConnID 1 ThisDN D ThisQueue C OtherDN A CallState OK
Release Phase (ConnID 1)

Important

If a call transfer is completed before it is put in an ACD queue, an EventPartyChanged is not generated.

Abnormal Call Flow

Interruption Point	PARTY A	PARTY B	PARTY C	PARTY D
*	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK
**	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK EventReleased ConnID 2 ThisDN B OtherDN C CallState OK	EventAbandoned ConnID 2 ThisDN C OtherDN B CallState OK
***	EventReleased ConnID 1 ThisDN A OtherDN D CallState OK			EventAbandoned ConnID 1 ThisDN D OtherDN A CallState OK

Two-Step Transfer to a Routing Point

The following graphic and table describe a two-step transfer to a routing point.

Two-Step Transfer to a Routing Point

PARTY A	PARTY B	PARTY C (ACD)	PARTY D
Call-Establishing Phase (ConnID 1)
	Hold (TInitiateTransfer)
	EventHeld ConnID 1 ThisDN B OtherDN A
	Consultation Call to C (TInitiateTransfer Continues)
	EventDialing ConnID 2 ThisDN B ThisDNRole Origination OtherDN C *DIAL OtherDNRole Destination CallType Consult	EventRouteRequest ConnID 2 ThisDN C ThisDNRole Destination OtherDN B OtherDNRole Origination
	Transfer Held Call to C (TComplete-Transfer)
EventPartyChanged ConnID 1 PreviousConnID 1 ThisDN A ThisDNRole Originationa OtherDN C ThirdPartyDN B ThirdPartyDNRole TransferredBy CallState Transferred	EventReleased ConnID 2 ThisDN B ThisDNRole Origination OtherDN C OtherDNRole Destination CallState Transferred EventReleased ConnID 1 ThisDN B ThisDNRole Destination OtherDN A CallState Transferred	EventPartyChanged ConnID 1 PreviousConnID 2 ThisDN C OtherDN A ThirdPartyDN B ThirdPartyDNRole TransferredBy CallState Transferred
		Diverts Call to D
		EventRouteUsed ConnID 1 ThisDN C OtherDN A ThirdPartyDN D*OPT	EventRinging ConnID 1 ThisDN D OtherDN A CallState OK
			Answer (TAnswerCall)
			EventEstablished ConnID 1 ThisDN D OtherDN A
Call-Establishing Phase (ConnID 1)

^a ThisDNRole must be Destination if party B is the call originator.

Abnormal Call Flow

Interruption Point	PARTY A	PARTY B	PARTY C	PARTY D
*	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK
**	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK EventReleased ConnID 2 ThisDN B OtherDN C CallState OK	EventAbandoned ConnID 2 ThisDN C OtherDN B CallState OK
***	EventReleased ConnID 1 ThisDN A OtherDN C CallState OK		EventAbandoned ConnID 1 ThisDN C OtherDN A CallState OK
****	EventReleased ConnID 1 ThisDN A OtherDN D CallState OK			EventAbandoned ConnID 1 ThisDN D OtherDN A CallState OK

Trunk Optimization: Trunk Anti-Tromboning

Trunk optimization: trunk anti-tromboning (TAT) scenarios apply to functionality available from certain Nortel switches and are very similar to the case of Two-Step Transfer: Complete After Consulted Party Answers. The following graphic identifies the call model used by T-Servers to indicate a TAT event.

Trunk Optimization: Trunk Anti-Tromboning

T-Server 1 PARTY A	T-Server 1 PARTY C	T-Server 2 PARTY B
Call-Establishing Phase (ConnID 1)
		Hold (TInitiateTransfer to C)
		EventHeld ConnID 1 ThisDN B OtherDN A
	EventRinging ConnID 2 ThisDN C OtherDN B	EventDialing ConnID 2 ThisDN B OtherDN C
	EventEstablished ConnID 2 ThisDN C OtherDN B	EventEstablished ConnID 2 ThisDN B OtherDN C
		TCompleteTransfer
	Trunk Optimization Occurs
EventPartyChanged ConnID 1 ThisDN A OtherDN C ThirdPartyDN B CallState RemoteRelease	EventPartyChanged ConnID 1 PreviousConnID 2 ThisDN C OtherDN A ThirdPartyDN B CallState RemoteRelease	EventReleased ConnID 1 ThisDN B OtherDN A CallState Transferred EventReleased ConnID 2 ThisDN B OtherDN C CallState Transferred

Single-Step Conference

The following graphic and table describe a single-step conference.

Single-Step Conference

PARTY A	PARTY B	PARTY C
Call-Establishing Phase (ConnID 1)
	TSingleStepConference
EventPartyAdded ConnID 1 ThisDN A OtherDN C ThirdPartyDN Ba	EventPartyAdded ConnID 1 ThisDN B OtherDN C ThirdPartyDN Ba	EventRinging ConnID 1 ThisDN C ThisDNRole ConferenceMember CallState OK
		EventEstablished ConnID 1 ThisDN C ThisDNRole ConferenceMember CallState Conferenced
Release from Conference Phase
Release Phase (ConnID 1)

^a ThirdPartyDN has a value of C if Party C initiates the request for a conference.

Conference

The following graphic and table describe a conference.

Important

This call model applies to two types of conferences: Two-Step Conference and Conference with Calls Merge.

Conference

PARTY A	PARTY B	PARTY C
Call-Establishing Phase (ConnID 1)
	Hold (See Application Activities for Different Types of Conference.)
	EventHeld ConnID 1 ThisDN B ThisDNRole Previous Role of DN OtherDN A OtherDNRole Previous Role of DN
	Consultation Call to C (See Application Activities for Different Types of Conference.)
Call-Establishing Phase (ConnID 2)
	Conference (See Application Activities for Different Types of Conference.)
EventPartyAdded ConnID 1 ThisDN A OtherDN C ThirdPartyDN B ThirdPartyDNRole AddedBy CallState Conferenced	EventReleased ConnID 2 ThisDN B OtherDN C CallState Conferenced EventRetrieved a ConnID 1 ThisDN B OtherDN A CallState Conferenced EventPartyAdded ConnID 1 ThisDN B OtherDNb C OtherDNRole NewParty ThirdPartyDN B ThirdPartyDNRole AddedBy CallState Conferenced	EventPartyChanged ConnID 1 PreviousConnID 2 ThisDN C ThirdPartyDN B ThirdPartyDNRole ConferencedBy CallState Conferenced
Release from Conference Phase
Release Phase (ConnID 1)

^a With EventRetrieved, the values for attributes ThisDNRole and ThisQueue are the same as those for the attributes of the same names, if any, in the events preceding EventRetrieved (EventEstablished and EvenRinging). For non-ACD calls, however, ThisQueue is not reported.
^b If only one party is added (as in the case of a simple conference call), the corresponding telephony object is specified in OtherDN. If more than one party is added, then the corresponding telephony objects are specified in Extensions.

Abnormal Call Flow

Interruption Point	PARTY A	PARTY B
*	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK

Application Activities for Different Types of Conference

Call Phase	Two-Step Conference	Conference with Calls Merge
HOLD	TInitiateConference	THoldCall
CONSULTATION CALL		TMakeCall
CONFERENCE	TCompleteConference	TMergeCalls

Blind Conference (Complete Before Consulted Party Answers)

The following graphic and table describe a blind conference (complete before the consulted party answers).

Blind Conference (Complete Before Consulted Party Answers)

PARTY A	PARTY B	PARTY C
Call-Establishing Phase (ConnID 1)
	Hold (See Application Activities for Different Types of Conference.)
	EventHeld ConnID 1 ThisDN B OtherDN A
	Consultation Call to C (See Application Activities for Different Types of Conference.)
	EventDialing ConnID 2 ThisDN B ThisDNRole Origination OtherDN C *DIAL OtherDNRole Destination *DIAL CallType Consult	EventRinging ConnID 2 ThisDN C ThisDNRole Destination OtherDN B OtherDNRole Origination CallType Consult
	Conference (See Application Activities for Different Types of Conference.)
EventPartyAdded ConnID 1 ThisDN A OtherDN C ThirdPartyDN B ThirdPartyDNRole AddedBy CallState Conferenced	EventReleased ConnID 2 ThisDN B OtherDN C CallState Conferenced EventRetrieved a ConnID 1 ThisDN B OtherDN A CallState Conferenced EventPartyAdded ConnID 1 ThisDN B OtherDN C ThirdPartyDN B ThirdPartyDNRole AddedBy CallState Conferenced	EventPartyChanged ConnID 1 PreviousConnID 2 ThisDN C ThirdPartyDN B ThirdPartyDNRole ConferencedBy CallState Conferenced
		Answer (TAnswerCall)
		EventEstablished ConnID 1 ThisDN C CallState Conferenced
Release from Conference Phase
Release Phase (ConnID 1)

^a With EventRetrieved, the values for attributes ThisDNRole and ThisQueue are the same as those for the attributes of the same names, if any, in the events preceding EventRetrieved (EventEstablished and EventRinging). For non-ACD calls, however, ThisQueue is not reported.

Important

If a call appears on the terminating party after completion of conference, the ConnID field of EventRinging is equal to the connection ID of the original call (ConnID 1), and EventPartyChanged is not generated.

Abnormal Call Flow

Interruption Point	PARTY A	PARTY B	PARTY C
*	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 ThisDN B OtherDN A CallState OK
**	EventReleased ConnID 1 ThisDN A OtherDN B *DIAL CallState OK	EventPartyDeleted ConnID 1 ThisDN B OtherDN A OtherDNRole DeletedParty ThirdPartyDN A ThirdPartyDNRole DeletedBy CallState OK

Conference with Two Incoming Calls Using TMergeCalls

The following graphic and table describe a conference with two incoming calls using TMergeCalls.

Conference with Two Incoming Calls Using TMergeCalls

PARTY A	PARTY B	PARTY C
Call-Establishing Phase (ConnID 1)
		Make Call to B (TMakeCall)
	EventRinging ConnID 2 ThisDN B ThisDNRole Destination OtherDN C OtherDNRole Origination CallState OK	EventDialing ConnID 2 ThisDN C ThisDNRole Origination OtherDN B *DIAL OtherDNRole Destination
	Place A on Hold (THoldCall)
	EventHeld ConnID 1 ThisDN B OtherDN A
	Answer (TAnswerCall)
	EventEstablished ConnID 2 ThisDN B ThisDNRole Destination OtherDN C OtherDNRole Origination	EventEstablished ConnID 2 ThisDN C ThisDNRole Origination OtherDN B OtherDNRole Destination
	Conference (TMergeCalls)
EventPartyAdded ConnID 1 ThisDN A OtherDN C OtherDNRole NewParty ThirdPartyDN B ThirdPartyDNRole AddedBy CallState Conferenced	EventReleased ConnID 2 ThisDN B ThisDNRole Destination OtherDN C OtherDNRole Origination CallState Conferenced EventRetrieved a ConnID 1 ThisDN B OtherDN A CallState Conferenced EventPartyAdded ConnID 1 ThisDN B OtherDN C OtherDNRole NewParty ThirdPartyDN B ThirdPartyDNRole AddedBy CallState Conferenced	EventPartyChanged ConnID 1 PreviousConnID 2 ThisDN C ThirdPartyDN B ThirdPartyDNRole ConferencedBy CallState Conferenced
Release from Conference Phase
Release Phase (ConnID 1)

^a With EventRetrieved, the values for attributes ThisDNRole and ThisQueue are the same as those for the attributes of the same names, if any, in the events preceding EventRetrieved (EventEstablished and EventRinging). For non-ACD calls, however, ThisQueue is not reported.

Abnormal Call Flow

Interruption Point	PARTY A	PARTY B	PARTY C
*		EventAbandoned ConnID 2 ThisDN B OtherDN C CallState OK	EventReleased ConnID 2 ThisDN C OtherDN B CallState OK
**	EventReleased ConnID 1 ThisDN A OtherDN B CallState OK	EventReleased ConnID 1 OtherDN A CallState OK