ZyXEL Communications V300 Guia do Utilizador descarregar pdf (Página 38)

V-300 Support Notes

Can the V300 support TFTP over WAN?

Although TFTP should work over WAN as well, it is not recommended because of the potential data corruption

problems.

VoIP FAQ

What is Voice over IP?

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 method to used this technology, the most

common and well known are SIP, and H.323.

How does Voice over IP work?

Basically VoIP is a technic 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.

Why use VoIP?

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.

What is the relationship between codec and VoIP?

In order to transfer voice (analog signal) over IP it first need to be digitized. Codec is a technic to digitize

analog signal to digital and vice versa. There are various speech codec available and can be used with VoIP

each with it's advantage and disadvantage.

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ZyXEL Communications V300 Guia do Utilizador Página 38