User manual ZYXEL PRESTIGE 2002 BROCHURE

[. . . ] Prestige 2002 Series VoIP Analog Telephone Adaptor User's Guide Version 3. 60 5/2005 Prestige 2002 Series User's Guide Copyright Copyright © 2005 by ZyXEL Communications Corporation. The contents of this publication may not be reproduced in any part or as a whole, transcribed, stored in a retrieval system, translated into any language, or transmitted in any form or by any means, electronic, mechanical, magnetic, optical, chemical, photocopying, manual, or otherwise, without the prior written permission of ZyXEL Communications Corporation. All rights reserved. Disclaimer ZyXEL does not assume any liability arising out of the application or use of any products, or software described herein. Neither does it convey any license under its patent rights nor the patent rights of others. [. . . ] The Prestige must register its public IP address with a SIP register server. If there is a NAT router between the Prestige and the SIP register server, the Prestige probably has a private IP address. The Prestige lists its IP address in the SIP message that it sends to the SIP register server. The SIP register server gets the Prestige's IP address from inside the SIP message and maps it to your SIP identity. If the Prestige has a private IP address listed in the SIP message, the SIP server cannot map it to your SIP identity. A SIP ALG (Application Layer Gateway), the fake WAN address on SIP and RTP, STUN, or outbound proxy features allow the Prestige to use its public IP address in the SIP messages. 5. 4. 1 SIP ALG Some NAT routers may include a SIP Application Layer Gateway (ALG). A SIP ALG allows SIP calls to pass through NAT by examining and translating IP addresses embedded in the data stream. When the Prestige registers with the SIP register server, the SIP ALG translates the Prestige's private IP address inside the SIP data stream to a public IP address. You do not need to use STUN or an outbound proxy if your Prestige is behind a SIP ALG. 5. 4. 2 Use NAT Address on SIP and RTP If you know the NAT router's public IP address and SIP port number, you can use the Use NAT feature to manually configure the Prestige to use a them in the SIP messages. You must also configure the NAT router to forward traffic with the SIP port number to the Prestige. Chapter 5 Introduction to VoIP 53 Prestige 2002 Series User's Guide 5. 4. 3 STUN STUN (Simple Traversal of User Datagram Protocol (UDP) through Network Address Translators) allows the Prestige to find the presence and types of NAT routers and/or firewalls between it and the public Internet. STUN also allows the Prestige to find the public IP address that NAT assigned, so the Prestige can embed it in the SIP data stream. STUN does not work with symmetric NAT routers (see Section 5. 3. 2. 4 on page 52) or firewalls. 2 The STUN server finds the public IP address and port number that the NAT router used on the Prestige's SIP packets and sends them to the Prestige. 3 The Prestige uses the public IP address and port number in the SIP packets that it sends to the SIP server. Figure 23 STUN 5. 4. 4 Outbound Proxy Your VoIP service provider may host a SIP outbound proxy server to handle all of the Prestige's VoIP traffic. This allows the Prestige to work with any type of NAT router and eliminates the need for STUN or a SIP ALG. Turn off a SIP ALG on a NAT router in front of the Prestige to keep it from retranslating the IP address (since this is already handled by the outbound proxy server). 5. 5 Pulse Code Modulation Pulse Code Modulation (PCM) measures analog signal amplitudes at regular time intervals and converts them into bits. 5. 6 Voice Coding A codec (coder/decoder) codes analog voice signals into digital signals and decodes the digital signals back into voice signals. The Prestige supports the following codecs. 54 Chapter 5 Introduction to VoIP Prestige 2002 Series User's Guide 5. 6. 1 G. 711 G. 711 is a Pulse Code Modulation (PCM) waveform codec. G. 711 provides very good sound quality but requires 64kbps of bandwidth. 5. 6. 2 G. 729 G. 729 is an Analysis-by-Synthesis (AbS) hybrid waveform codec that uses a filter based on information about how the human vocal tract produces sounds. G. 729 provides good sound quality and reduces the required bandwidth to 8kbps. 5. 7 PSTN Call Setup Signaling Dual-Tone MultiFrequency (DTMF) signaling uses pairs of frequencies (one lower frequency and one higher frequency) to set up calls. Each of the keys on a DTMF telephone corresponds to a different pair of frequencies. Pulse dialing sends a series of clicks to the local phone office in order to dial numbers. 1 5. 8 MWI (Message Waiting Indication) Enable Message Waiting Indication (MWI) enables your phone to give you a message­ waiting (beeping) dial tone when you have a voice message(s). Your voice service provider must have a messaging system that sends message waiting status SIP packets as defined in RFC 3842. 1. The Prestige does not support pulse dialing at the time of writing. Chapter 5 Introduction to VoIP 55 Prestige 2002 Series User's Guide 56 Chapter 5 Introduction to VoIP Prestige 2002 Series User's Guide CHAPTER 6 VoIP Screens This chapter describes how to configure advanced VoIP and QoS settings. 6. 1 VoIP Introduction VoIP is the sending of voice signals over the Internet Protocol. [. . . ] PPPoE provides access control and billing functionality in a manner similar to dial-up services using PPP. Benefits of PPPoE PPPoE offers the following benefits: It provides you with a familiar dial-up networking (DUN) user interface. It lessens the burden on the carriers of provisioning virtual circuits all the way to the ISP on multiple switches for thousands of users. It allows the ISP to use the existing dial-up model to authenticate and (optionally) to provide differentiated services. Traditional Dial-up Scenario The following diagram depicts a typical hardware configuration where the computers use traditional dial-up networking. Appendix D PPPoE 131 Prestige 2002 Series User's Guide Figure 66 Single-Computer per Router Hardware Configuration How PPPoE Works The PPPoE driver makes the Ethernet appear as a serial link to the computer and the computer runs PPP over it, while the modem bridges the Ethernet frames to the Access Concentrator (AC). Between the AC and an ISP, the AC is acting as a L2TP (Layer 2 Tunneling Protocol) LAC (L2TP Access Concentrator) and tunnels the PPP frames to the ISP. [. . . ]