VoIP（Voice over Internet Protocol）為網(wǎng)絡電話（又叫寬帶電話）。VoIP和傳統(tǒng)電話最大的不同在于語音的傳輸方式，VoIP不是通過電信運營商的傳統(tǒng)電話網(wǎng)絡進行傳輸，而是將語音（Voice）模擬信號進行數(shù)字化，將數(shù)據(jù)通過數(shù)據(jù)封包（Data Packet）的形式在IP互聯(lián)網(wǎng)絡（IP Network）上進行實時傳輸。
VoIP相對傳統(tǒng)電話來說比較便宜甚至是免費的，而且還能夠提供長時間在線的語音通話，廣泛應用于國內外的長途電話中，網(wǎng)絡通信前景廣闊。但是由于VoIP通信是基于網(wǎng)絡，受網(wǎng)絡狀態(tài)影響比較大，存在數(shù)據(jù)掉包、延遲等現(xiàn)象，清晰度與傳統(tǒng)的固話有差距，通話語音質量差等缺點。為了提高VoIP的語音通話質量，睿輝聲學實驗室（VoiceX）可提供符合測試標準的環(huán)境和全套測試設備，為客戶提供科學詳細的測試數(shù)據(jù)，不斷地在測試調試中得到更好的語音通話質量。

測試框圖
被測樣品DUT通過MFE IX或者路由器wifi注冊到SIP Server, MFE VIII.1、MFE VI.1提供網(wǎng)絡連接和模擬各種網(wǎng)絡狀態(tài)。DUT與內置仿真嘴和仿真耳的仿真人頭進行語音交互，仿真人和MFE VI.1連接發(fā)送/接收語音信號。安裝有測試系統(tǒng)的PC通過USB線分別連接MFE VIII.1、MFE VI.1和MFE IX，統(tǒng)一控制/分析發(fā)送/接收信號。

測試設備與環(huán)境
睿輝聲學實驗室（VoiceX）具有符合測試標準的全套測試設備和專業(yè)的測試工程師，能夠為客戶提供全面的測試方案和詳細的咨詢服務。

相關測試標準
–EIA/TIA-810
Telecommunications Telephone Terminal Equipment Transmission Requirements for Narrowband Digital Telephones, (North America), Digital & VoIP Terminals

–TIA-920
Digital Interface Communications Devices with Handsets

–ITU-T G.168,
SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS International telephone connections and circuits – Apparatus associated with long distance telephone circuits; Digital network echo canceller

–FZ TSEC
Technical Specification EC Deutsche Telekom AG, Network Speech Echo Cancellers

–FZ TSEC-L
Technical Specification EC Deutsche Telekom AG, Network Speech Echo Cancellers incl. Limits

–ETSI ES 202 737 / ES 202 738,
Speech and multimedia Transmission Quality (STQ);
Transmission requirements for narrowband VoIP terminals (handset and headset + loud speaking and handsfree ) from a QoS perspective as perceived by the user; Narrowband IP Phones

–ETSI ES 202 739 / ES 202 740,
Speech and multimedia Transmission Quality (STQ);
Transmission requirements for wideband VoIP terminals (handset and headset + loud speaking and handsfree terminals) from a QoS perspective as perceived by the user; Wideband IP Phones

–TS 102 924/925
Speech and multimedia Transmission Quality (STQ);
Transmission requirements for Super-Wideband / Full band handset and headset / handsfree and conferencing terminals from a QoS perspective as perceived by the user

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