The default set by CA_Set_Send_Voice_Msg_Defaults() is zero (send immediately).
The default set by CA_Set_Send_Voice_Msg_Defaults() is SECURITY_PRIVATE.
The default set by CA_Set_Send_Voice_Msg_Defaults() is URGENCY_NORMAL.
The ACK_NO_OUTGOING flag can also be specified or logically ORed with the ACK_REQUESTED or ACK_NOT_REQUESTED flags. Using ACK_NO_OUTGOING flag means that the message is not left in the sender’s list of outgoing messages, so the sender cannot subsequently delete the message before the recipient has seen it.
The default set by CA_Set_Send_Voice_Msg_Defaults() is ACK_REQUESTED.