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ZyXEL Communications P2000W V2 manual

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Table of contents for the manual

  • Page 1

    P2000W V2 VoIP wireless phone Troubleshooting Guide May 2005[...]

  • Page 2

    [...]

  • Page 3

    P2000W V2 Troubleshooting Guide Customer Support Please have the following information r eady when you contact customer support. • Product model and serial number. • Firmware version of your device. • Brief description of the problem a nd the steps you took to solve it. • Call server type and vendor. • Packet trace log as instructed on th[...]

  • Page 4

    P2000W V2 Troubleshooting Guide Introduction The Prestige P2000W V2 is a SIP-based Vo IP 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 im plementing SIP. The Prestige allows you to receive Voice ove r IP calls. You can call any [...]

  • Page 5

    P2000W V2 Troubleshooting Guide 1. What is VoI P? Voice over IP is an emerging t echnology based on open standards of IEEE, fundamentally the Internet Protocol that allows voice data to travel across t he Internet. T h e r e a r e m a n y methods to use this technology, the most common and well known are SIP, and H.323. 2. How does VoIP work? Basic[...]

  • Page 6

    P2000W V2 Troubleshooting Guide 6. What is the differenc e between H.323 and SIP? H.323 and SIP are proposed by different group Session Initiation Protocol (SIP) is a standard introduced by t he Internet Engineering Task Force in 1999 to carry voice over IP. Since it was created by t h e IETF, it ap proaches voice and multimedia from the Internet, [...]

  • Page 7

    P2000W V2 Troubleshooting Guide 10. How are voice quality normally rated? Voice quality is most commonly rated through a voice quality me tric called the Mean Opinion Score (MOS) which is recommendation by ITU-T. T h e MOS is a 5 point scale where 5 represent excellent voi ce quality and 1 represent bad v oice quality. 11. What is codec? Codec is a[...]

  • Page 8

    P2000W V2 Troubleshooting Guide 1. Power off the device. 2. Keep hold down the Power and Left-Selector button until you see <<Load Default>> <<Factory>> words in the LCD screen than release it. 3. Now all setting has been reset to default. 16. What is th e P2000W V2 supported Codec? P2000W V2 supported codec are G.729 voice [...]

  • Page 9

    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 [...]

  • Page 10

    P2000W V2 Troubleshooting Guide 2. How can I check if probl em is cause by NAT or not? ion. One of the best way to see if the problem is cause by NAT or not is to put P2000W V2 on publ ic n etwork, (With d NA T than very likely your NAT gateway is not supporting SIP pass-through. In such condition you will need to There may not be an easy or quick [...]

  • Page 11

    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 like ly th er e is NAT rou te r be fo re r tips to troublesh oot. it, please see NAT related question above fo 6. I can make a call but t he voice only goes one way not bothway? If you can register to server but[...]

  • Page 12

    P2000W V2 Troubleshooting Guide 9. The support tells me, I may hav e an interoperability issue w ith my ITSP call server. Packet trace is requested by support to analyze the problem. How should I setup e environment and how do I trace the packet? to perform B ereal" to make the packet capture. Eth er ea l i s a freeware and can be downloaded f[...]

  • Page 13

    P2000W V2 Troubleshooting Guide 2. Connect the PC with packet sn iffer installed to the hub. 3. Start packet sniffing softwa re and start packet capturing. 4. Start P2000W V2 and make a complete call f rom registering to calling a party until problem appears. 5. Stop capturing and save the captured packet in file. 1. Connect the hub between the P20[...]

  • Page 14

    P2000W V2 Troubleshooting Guide The corrected working capture should include starting of the ca ll (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 n protoc[...]

  • Page 15

    P2000W V2 Troubleshooting Guide and will soon run out. Thus NAT is very commonly used. Unfo rtunately from field test many vendor’s NAT are not SIP friendly. Fortunately, there are already ways to workaround the NAT for SIP. The most ommonly used way is listed below. c SIP pass-through support on NAT router (req uire router vendor implement it). [...]