標準號：ANSI/TIA-664-504-B-2007
中文標準名稱：無線特征描述.無應答呼叫前轉(CFNA)
英文標準名稱：Wireless Features Description: Call Forwarding - No Answer (CFNA)
標準類型：M19
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：M19
國際標準分類號：33.070.50
適用范圍：Call Forwarding - No Answer (CFNA) permits a called subscriber to have the system send incoming calls addressed to the called subscriber's Directory Number to another Directory Number (forward-to number) or to the called subscriber's designated voice mailbox, when the subscriber fails to answer, or is otherwise inaccessible (including no paging response, the subscriber's location is not known the subscriber is reported as inactive, Call Delivery not active for a roaming subscriber, Do Not Disturb active, etc.). CFNA does not apply when the subscriber is considered to be busy.