ZyXEL Communications P-2000W User Manual
P-2000W V2
VoIP wireless phone
Troubleshooting Guide
May 2005
P2000W V2 Troubleshooting Guide
Customer Support
Please have the following information ready when you contact customer support.
• Product model and serial number.
• Firmware version of your device.
• Brief description of the problem and the steps you took to solve it.
• Call server type and vendor.
• Packet trace log as instructed on the troubleshooting in this guide.
Table of Contents
Introduction............................................................................................................................................Page 4
Frequently asked question........................................... ... .. ..... .. ... .. ..... .. .. ... .. ..... .. .. ... .. ..... .. .. ... ................Page 4
VoIP tr ou bleshoot ing.................................. .. .. ... .. ..... .. .. ... .... ... .. .. ... ..... .. .. ... .... ... .. .. ..... .. ... .. .. ...................Page 9
The VoIP Challenge.................................................... ....... ....... .......... ....... ....... ....... ......... .....................Page 14
Table of Contents iii
P2000W V2 Troubleshooting Guide
Introduction
The Prestige P2000W V2 is a SIP-based VoIP wireless phone. Sending voice signals
over the Internet is called Voice over IP or VoIP. Session Initiated Protocol (S IP) is
an internationally recognized standard for implementing SIP.
The Prestige allows you to receive Voic e over IP calls. You can call any landline or
mobile telephones as well as IP telephones. Calls received from IP telephone work
exactly as you would expect from traditional telephone service.
Although SIP is an internationally recognized standard there are still possibility of
interoperability issue occur with ITSP due to vendor’s different interpretation of the
SIP standard. Therefore we suggest an interoperability test with the call server is
conducted prior to device deployment.
Below are some frequently asked question which can help a better understand what is
VoIP.
Frequently Asked Question
What is VoIP?
How does VoIP work?
Why use IP for voice?
What is the relationship between codec and VoIP?
What advantage does VoIP can provide?
What is the difference between H.323 and SIP?
Can H.323 and SIP interoperate with one another?
What do I need in order to use SIP?
What is voice quality?
How are voice quality normally rated?
What is codec?
What is the relation of codec and VoIP?
Which codec should I choose?
I have press load default setting from Menu->Setting->Load Default option
from the phone cursor but the device seems not fully reset?
How do I reset the device to factory default?
What is the P2000W V2 supported Codec?
What is the P2000W V2 voice codec packet size and packet interval
relationship?
Can P2000W V2 support outbound proxy?
Can P2000W V2 support STUN?
All contents copyright (c) 2005 ZyXEL Communications Corporation.
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 cir cuit 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 email, instant messaging, video, voice mail all together. Whe re current circuit
switching (PSTN) can not.
All contents copyright (c) 2005 ZyXEL Communications Corporation.
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