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P-2000W V2
VoIP wireless phone
Troubleshooting Guide
May 2005
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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.................................................................................
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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 (SIP) is an internationally recognized standard for implementing SIP. The Prestige allows you to receive Voice 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 traditiona
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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
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P2000W V2 Troubleshooting Guide 6. What is the difference between H.323 and SIP? H.323 and SIP are proposed by different group Session Initiation Protocol (SIP) is a standard introduced by the Internet Engineering Task Force in 1999 to carry voice over IP. Since it was created by the IETF, it approaches voice and multimedia from the Internet, or IP, perspective of view. Where as H.323 emerged around 1996, and as an International Telecommunication Union standard it was designed from a
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P2000W V2 Troubleshooting Guide Voice quality is most commonly rated through a voice quality metric called the Mean Opinion Score (MOS) which is recommendation by ITU-T. The MOS is a 5 point scale where 5 represent excellent voice quality and 1 represent bad voice quality. 11. What is codec? Codec is an algorithm which converts analog signal into digital signal and vice versa. There are three main types of waveform codec, source codec, and hybrid codec. Each consume different amoun
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P2000W V2 Troubleshooting Guide 1. Power off the device. 2. Keep hold down the Power and Left-Selector button until you see <> <> words in the LCD screen than release it. 3. Now all setting has been reset to default. 16. What is the P2000W V2 supported Codec? P2000W V2 supported codec are G.729 voice codec G.711u-law voice codec G.711a-law voice codec 17. What is the P2000W V2 voice codec packet size and packet interval relationship? P2000W V2
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P2000W V2 Troubleshooting Guide 19. Can P2000W V2 support STUN? Yes, P2000W V2 can support STUN. VoIP Troubleshooting Is it a hardware problem? How can I check if problem is cause by NAT or not? If I've confirmed it is not an NAT. What should I do? Unable to register with the SIP server? I can register but can not establish a call? I can make a call but the voice only goes one way not bothway? I can receive a call but the voice only goes one way not bothway? If a
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P2000W V2 Troubleshooting Guide 2. How can I check if problem is cause by NAT or not? There may not be an easy or quick answer to this question. One of the best way to see if the problem is cause by NAT or not is to put P2000W V2 on public network, (With public IP and no NAT) see if it work under such condition. If you it can work on public network but can not work behind NAT than very likely your NAT gateway is not supporting SIP pass-through. In such condition you will need to con
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P2000W V2 Troubleshooting Guide 5. I can register but can not establish a call? If you can register to server but can not make a call very likely there is NAT router before it, please see NAT related question above for tips to troubleshoot. 6. I can make a call but the voice only goes one way not bothway? If you can register to server but can make a call signal establishment but the voice only goes one way very likely there are NAT router before it, please see NAT related question ab
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P2000W V2 Troubleshooting Guide 9. The support tells me, I may have an interoperability issue with my ITSP call server. Packet trace is requested by support to analyze the problem. How should I setup the environment and how do I trace the packet? In such as you will need to setup your environment similar as scenario A & B to perform packet trace. Make a failed trace and make a successful trace by setting up scenario A & B and send it to support for problem analysis. To perform packe
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P2000W V2 Troubleshooting Guide 3. Start packet sniffing software and start packet capturing. 4. Start P2000W V2 and make a complete call from registering to calling a party until problem appears. 5. Stop capturing and save the captured packet in file. Scenario B 1. Connect the hub between the P2000W V2 and the front end CPE with Ethernet cable (Make sure P2000W V2 is with public IP). 2. Connect the PC with packet sniffer installed to the hub. 3. Start packet sniffing software an
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P2000W V2 Troubleshooting Guide The corrected working capture should include starting of the call (The SIP invite) to call pickup (The SIP ACK). An example of successful call capture is listed below for your reference. Once both of the above capture is completed, send both captured file to support to analysis the cause. The VoIP challenge SIP is a session initiation protocol which is an application-layer control (signaling) protocol for creating, modifying, and terminating sessio
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P2000W V2 Troubleshooting Guide Fortunately, there are already ways to workaround the NAT for SIP. The most commonly used way is listed below. SIP pass-through support on NAT router (require router vendor implement it). STUN. Outbound Proxy. There are advantage and disadvantage of each technology. For example SIP pass-through on NAT router this requires router vendor implementation. From carrier point of view this does not seem feasible as not every NAT router vendor impleme
