The ConnectIncomingCallWithoutInviteAck function allows an application to specify that the VOIP Media Engine should enter the "In Call" state for incoming phone calls even though a final INVITE ACK was not received from the far end of the call. Normally an application does not have to call this API procedure unless the far end SIP device does not handle the SIP protocol properly.

If you are having problems connecting inbound phone calls, you must determine if the far end of the call ever sent the final INVITE ACK SIP message. If it does, you probably have a time-out issue. In that case, you might have to increase the final ACK time-out value using the SetInboundInviteAckTimeout(UInt32) API procedure. If you have determined that the far end SIP device does not transmit final INVITE ACKs properly, you can still get the VOIP Media Engine to connect the incoming call by calling this procedure.

Namespace:  LanScape
Assembly:  LMEVoipManaged (in LMEVoipManaged.dll) Version: 6.0.5226.26700


public VoipMediaEngine..::.TELEPHONY_RETURN_VALUE ConnectIncomingCallWithoutInviteAck(
	bool EnableState
Visual Basic (Declaration)
Public Function ConnectIncomingCallWithoutInviteAck ( _
	EnableState As Boolean _
Visual C++
VoipMediaEngine..::.TELEPHONY_RETURN_VALUE ConnectIncomingCallWithoutInviteAck(
	bool EnableState
public VoipMediaEngine..::.TELEPHONY_RETURN_VALUE ConnectIncomingCallWithoutInviteAck(
	boolean EnableState


Type: System..::.Boolean
If set to a non zero value, the VOIP Media Engine will ignore the reception of the final INVITE ACK and proceed to connect the inbound call immediately.

Return Value

If the function succeeds, the return value will be SipSuccess.

If the function fails, the return value will be one of the following values as specified by the VoipMediaEngine..::.TELEPHONY_RETURN_VALUE data type.

Return ValueDescription
Application software specified an invalid telephony handle in one of the API procedures. This usually indicates memory corruption on the part of application software.

(API return value)



See Also