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P2000W V2 Troubleshooting Guide
1. What is VoIP?
Voice over IP is an emerging technology based on open standards of IEEE, fundamentally
the Internet Protocol that allows voice data to travel across the Internet. There are many
methods to use this technology, the most common and well known are SIP, and H.323.
2.
How does VoIP work?
Basically VoIP is a technique to send voice information in digital form in discrete packets
over digital network rather than by using traditional circuit switch (PSTN). To do so we
will need an analog to digital converter on sender side to translate the voice (analog signal)
to digital than transmit it, and on the receiver end it will also need an analog to digital
converter to covert the digital signal back to analog to the person being called can heard
the voice.
3. Why use IP for voice?
Traditionally telephony carrier use circuit switching for carrying voice traffic. As
circuit switching is designed to carry voice and it does it very well. Than why use IP
for voice? As broadband booms, and technology evolve. People now want to
communicate through various way not just voice such as email, instant messaging,
video and so on. Traditional telephony can not evolve as quickly as the demand and
develop new feature on circuit switch takes much time and money. IP is an already
exist standard and many type of service already runs on IP, by using IP as a platform
integrate service is now possible and low cost where traditional circuit may take long
time to achieve.
4. What is the relationship between codec and VoIP?
In order to transfer voice (analog signal) over IP it first needs to be digitized. Codec is a
technique to digitize analog signal to digital and vice versa. There are various speech
codec available and can be used with VoIP each with its advantage and disadvantage.
5. What advantage does VoIP can provide?
The advantage of VoIP is it can provide advance services such as joining e-mail, instant
messaging, video, voice mail all together. Where current circuit switching (PSTN) can not.
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