文章分类 -  VoIP

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VoIP技术以及网络部署
关于RFC3261中REGISTER方法的Call-ID的问题
摘要：根据8.1.1.4节，一个UA的每一个注册的Call-ID必须都是相同的。 阅读全文
posted @ 2012-02-19 23:08 茫茫深海一条鱼 阅读(248) 评论(0) 推荐(0)
RFC3515--The Session Initiation Protocol (SIP) Refer Method
摘要：Network Working Group R. SparksRequest for Comments: 3515 dynamicsoftCategory: Standards Track April 2003 The Session Initiation Protocol (SIP) Refer MethodStatus of this Memo T... 阅读全文
posted @ 2012-02-03 11:54 茫茫深海一条鱼 阅读(422) 评论(0) 推荐(0)
RFC3631中关于端对端呼叫的一个根据
摘要：While an FQDN is preferred, many end systems do not have registered domain names, so IP addresses are permitted.也就是说，即使没有注册账号，直接拨打IP呼叫也是允许的，只是From和Contact只是呼叫者的IP地址。 阅读全文
posted @ 2012-01-17 23:34 茫茫深海一条鱼 阅读(131) 评论(0) 推荐(0)
RFC3455--Private Header (P-Header) Extensions to the Session Initiation Protocol (SIP) for the 3rd-Generation Partnershi
摘要：Network Working Group M. Garcia-MartinRequest for Comments: 3455 EricssonCategory: Informational E. Henrikson Lucent ... 阅读全文
posted @ 2011-10-20 17:24 茫茫深海一条鱼 阅读(493) 评论(0) 推荐(0)
LEC (local exchange carrier)
摘要：LEC (local exchange carrier) is the term for a public telephone company in the U.S. that provides local service. Some of the largest LECs are the Bell operating companies (BOCs) which were grouped into holding companies known collectively as the regional Bell operating companies (RBOCs) when the Bel 阅读全文
posted @ 2011-09-09 00:09 茫茫深海一条鱼 阅读(502) 评论(0) 推荐(0)
音频编码协议介绍
摘要：转载自：罗素工作室音频压缩是一种形式的数据压缩，其被设计来减少音频文件的大小。音频压缩算法在计算机软件上实现叫做音频编码。音频编解码器是一个计算机程序，其根据一个给定音频文件格式或流音频格式压缩/解压缩数字音频数据。大部分编解码器被当作库实现，它的接口接到一个或更多多媒体播放器。针对音频压缩不同标准组织和公司有很多不同技术和标准可用，在下列表格中，主要的被列举如下：编解码器类型标准组织调制方法位率（kb/s）采样率（kHz）G.711ITU-TPCM648G.721ITU-TADPCM328G.722ITU-TADPCM6416G.722.1ITU-T基于交换的24/3216G.722.2IT 阅读全文
posted @ 2011-08-14 20:54 茫茫深海一条鱼 阅读(674) 评论(0) 推荐(0)
音频编解码标准
摘要：转载自：http://www.rosoo.net/a/200911/8001.htmlPCMU(G.711U)类型：Audio制定者：ITU-T所需频宽：64Kbps(90.4)特性：PCMU和PCMA都能提供较好的语音质量，但是它们占用的带宽较高，需要64kbps。优点：语音质量优缺点：占用的带宽较高应用领域：voip版税方式：Free备注：PCMU and PCMA都能够达到CD音质，但是它们消耗的带宽也最多(64kbps)。如果网络带宽比较低，可以选用低比特速率的编码方法，如G.723或G.729，这两种编码的方法也能达到传统长途电话的音质，但是需要很少的带宽（G723需要5.3/6.3 阅读全文
posted @ 2011-08-14 20:50 茫茫深海一条鱼 阅读(747) 评论(0) 推荐(0)
RFC2848--The PINT Service Protocol: Extensions to SIP and SDP for IP Access to Telephone Call Services
摘要：Network Working Group S. PetrackRequest for Comments: 2848 MetaTelCategory: Standards Track L. Conroy Siemens Roke Manor Research June 2000 The PINT Service Protocol: Extensions to SIP and SDP for IP Access to Telephone Call ServicesStatus of this Memo This document specifies an Internet standards t 阅读全文
posted @ 2011-08-08 19:30 茫茫深海一条鱼 阅读(519) 评论(0) 推荐(0)
RFC3842--A Message Summary and Message Waiting Indication Event Package for the Session Initiation Prot
摘要：Network Working Group R. MahyRequest for Comments: 3842 Cisco Systems, Inc.Category: Standards Track August 2004 A Message Summary and Message Waiting Indication Event Package for the Session Initiation Protocol (SIP)Status of this Memo This document specifies an Internet standards track protocol fo 阅读全文
posted @ 2011-08-08 19:29 茫茫深海一条鱼 阅读(271) 评论(0) 推荐(0)
RFC2833
摘要：Network Working Group H. SchulzrinneRequest for Comments: 2833 Columbia UniversityCategory: Standards Track S. Petrack MetaTel May 2000 RTP Payload for DTMF Digits, Telephony Tones and Telephony SignalsStatus of this Memo This document specifies an Internet standards track protocol for the Internet 阅读全文
posted @ 2011-07-04 11:10 茫茫深海一条鱼 阅读(348) 评论(0) 推荐(0)
RFC3264—— An Offer/Answer Model with the Session Description Protocol (SDP)
摘要：Network Working Group J. RosenbergRequest for Comments: 3264 dynamicsoftObsoletes: 2543 H. SchulzrinneCategory: Standards Track Columbia U. June 2002 An Offer/Answer Model with the Session Description Protocol (SDP)Status of this Memo This document specifies an Internet standards track protocol for 阅读全文
posted @ 2011-06-29 11:31 茫茫深海一条鱼 阅读(311) 评论(0) 推荐(0)
多种codec认识
摘要：需要了解下列各种codec的优缺点以及原理等：L16 codecspeex codeciLBC codecG.722 codecG.722.1 codecAMR codecG.726 codecG.722.1C 阅读全文
posted @ 2011-06-15 13:50 茫茫深海一条鱼 阅读(355) 评论(0) 推荐(0)
RFC1889—— RTP: A Transport Protocol for Real-Time Applications
摘要：Network Working Group Audio-Video Transport Working GroupRequest for Comments: 1889 H. SchulzrinneCategory: Standards Track GMD Fokus S. Casner Precept Software, Inc. R. Frederick Xerox Palo Alto Research Center V. Jacobson Lawrence Berkeley National Laboratory January 1996 RTP: A Transport Protocol 阅读全文
posted @ 2011-06-15 09:22 茫茫深海一条鱼 阅读(564) 评论(0) 推荐(0)
speex
摘要：Speex is a patent-free audio compression format designed for speech and also a free software speech codec that may be used on VoIP applications and podcasts.[5] It is based on the CELP speech coding algorithm.[6] Speex claims to be free of any patent restrictions and is licensed under the revised (3 阅读全文
posted @ 2011-06-12 21:03 茫茫深海一条鱼 阅读(259) 评论(0) 推荐(0)
Echo Cancellation
摘要：Echo cancellationFrom Wikipedia, the free encyclopediaThis article needs additional citations for verification.Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (January 2011)The term echo cancellation is used in telephony to describe t 阅读全文
posted @ 2011-06-10 11:41 茫茫深海一条鱼 阅读(1020) 评论(0) 推荐(0)
RFC3951-- Internet Low Bit Rate Codec (iLBC)
摘要：Network Working Group S. AndersenRequest for Comments: 3951 Aalborg UniversityCategory: Experimental A. Duric Telio H. Astrom R. Hagen W. Kleijn J. Linden Global IP Sound December 2004 Internet Low Bit Rate Codec (iLBC)Status of this Memo This memo defines an Experimental Protocol for the Internet c 阅读全文
posted @ 2011-06-02 10:49 茫茫深海一条鱼 阅读(602) 评论(0) 推荐(0)
rfc2783——A DNS RR for specifying the location of services (DNS SRV)
摘要：Network Working Group A. GulbrandsenRequest for Comments: 2782 Troll TechnologiesObsoletes: 2052 P. VixieCategory: Standards Track Internet Software Consortium L. Esibov Microsoft Corp. February 2000 A DNS RR for specifying the location of services (DNS SRV)Status of this Memo This document specifie 阅读全文
posted @ 2011-05-29 23:46 茫茫深海一条鱼 阅读(300) 评论(0) 推荐(0)
RFC2915----The Naming Authority Pointer (NAPTR) DNS Resource Record
摘要：Network Working Group M. MeallingRequest for Comments: 2915 Network Solutions, Inc.Updates: 2168 R. DanielCategory: Standards Track DATAFUSION, Inc. September 2000 The Naming Authority Pointer (NAPTR) DNS Resource RecordStatus of this Memo This document specifies an Internet standards track protocol 阅读全文
posted @ 2011-05-29 22:18 茫茫深海一条鱼 阅读(374) 评论(0) 推荐(0)
RFC1885-- DNS Extensions to support IP version 6
摘要：Network Working Group S. ThomsonRequest for Comments: 1886 BellcoreCategory: Standards Track C. Huitema INRIA December 1995 DNS Extensions to support IP version 6Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and s 阅读全文
posted @ 2011-05-28 20:54 茫茫深海一条鱼 阅读(158) 评论(0) 推荐(0)
RFC1035--DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION
摘要：Network Working Group P. MockapetrisRequest for Comments: 1035 ISI November 1987Obsoletes: RFCs 882, 883, 973 DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION1. STATUS OF THIS MEMOThis RFC describes the details of the domain system and protocol, andassumes that the reader is familiar with the concept 阅读全文
posted @ 2011-05-28 20:52 茫茫深海一条鱼 阅读(454) 评论(0) 推荐(0)

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