Get Sip Error Response Code 401
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SIP is based around request/response transactions, in a similar manner to the Hypertext Transfer Protocol (HTTP). Each transaction consists of a
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SIP request (which will be one of several request methods), and sip 486 busy here at least one response.[1]:p11 SIP requests and responses may be generated by any SIP user agent; user
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agents are divided into clients (UACs), which initiate requests, and servers (UASes), which respond to them.[1]:§8 A single user agent may act as both UAC and UAS sip response codes pdf for different transactions:[1]:p26 for example, a SIP phone is a user agent that will be a UAC when making a call, and a UAS when receiving one. Additionally, some devices will act as both UAC and UAS for a single transaction; these are called Back-to-Back User Agents (B2BUAs).[1]:p20 SIP responses specify a three-digit integer response code, sip 486 busy here call flow which is one of a number of defined codes that detail the status of the request. These codes are grouped according to their first digit as "provisional", "success", "redirection", "client error", "server error" or "global failure" codes, corresponding to a first digit of 1–6; these are expressed as, for example, "1xx" for provisional responses with a code of 100–199.[1]:§7.2 The SIP response codes are an extension to the HTTP response codes, although not all HTTP response codes are valid in SIP.[1]:§21 SIP responses also specify a "reason phrase", and a default reason phrase is defined with each response code.[1]:§7.2 These reason phrases can be varied, however, such as to provide additional information[1]:§21.4.18 or to provide the text in a different language.[1]:§20.3 SIP, including the response codes and corresponding reason phrases, is defined in Internet Engineering Task Force (IETF) Requests for Comments (RFCs), namely RFC 3261.[2] That RFC includes provisions for later RFCs to update the specification.[1]:§8.1.1.9 Specific parts of the SIP protocol, including respons
Rosenberg Request for Comments: 3261 dynamicsoft Obsoletes: 2543 H. Schulzrinne Category: Standards Track Columbia U. G. Camarillo Ericsson A.
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Johnston WorldCom J. Peterson Neustar R. Sparks dynamicsoft M. Handley sip cancel ICIR E. Schooler AT&T June 2002 SIP: Session Initiation Protocol Status of this Memo This document
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specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the https://en.wikipedia.org/wiki/List_of_SIP_response_codes "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (2002). All Rights Reserved. Abstract This document describes Session Initiation Protocol (SIP), an application-layer control (signaling) protocol for creating, modifying, and terminating sessions with https://tools.ietf.org/html/rfc3261 one or more participants. These sessions include Internet telephone calls, multimedia distribution, and multimedia conferences. SIP invitations used to create sessions carry session descriptions that allow participants to agree on a set of compatible media types. SIP makes use of elements called proxy servers to help route requests to the user's current location, authenticate and authorize users for services, implement provider call-routing policies, and provide features to users. SIP also provides a registration function that allows users to upload their current locations for use by proxy servers. SIP runs on top of several different transport protocols. Rosenberg, et. al. Standards Track [Page 1] RFC 3261 SIP: Session Initiation Protocol June 2002 Table of Contents 1 Introduction ........................................ 8 2 Overview of SIP Functionality ....................... 9 3 Terminology ......................................... 10 4 Overview of Operation ............................... 10 5 Structure of the Protocol ........................... 18 6 Definitions ......................................... 20 7 SIP Messages ........................................ 26 7
LEARN User Manual Administrator Manual Webinars / Events Case Studies Whitepapers 3CX Academy SUPPORT Support / Help Support Portal Forums Supported IP Phones Supported VoIP Gateways Supported SIP Trunks PARTNERS Partner Program Partner Application Form Partner Portal Find http://www.3cx.com/pbx/sip-responses/ a Partner Partner Events Technology Partners COMPANY Company News Press Centre Careers Customers Testimonials Contact Us TRY BUY Pricing Edition Comparison Find a Reseller Request Quote BLOG Product Releases Docs and FAQ https://andrewjprokop.wordpress.com/2014/06/18/understanding-sip-responses/ Events VoIP How to http://www.3cx.com/wp-content/uploads/2015/05/slider1Background-A.jpg Gear up your PBX Cut costs, Boost profits Brochure Try http://www.3cx.com/wp-content/uploads/2015/05/slider1Background-A.jpg Take control of your PBX Virtualize with Hyper-V & VMWare Brochure Try http://www.3cx.com/wp-content/uploads/2015/05/slider1Background-A.jpg Slash your response code Phone Bill Use SIP trunks, WebRTC & Softphones Brochure Try http://www.3cx.com/wp-content/uploads/2015/05/slider5Background-A.jpg Unified Communications Presence, Chat, Voicemail, Fax 2 Email Brochure Try http://www.3cx.com/wp-content/uploads/2015/05/slider2Background-B.jpg Office Without Limits Make calls anywhere using Android, iPhone, Mac & Windows Brochure Try http://www.3cx.com/wp-content/uploads/2015/05/slider5Background-A.jpg Web Conferencing Clientless via WebRTC with 3CX WebMeeting Brochure Try Overview Easy Admin & Install Halve YourPhone Bill UnifiedCommunications Android / iOS Mobile clients Win & sip 486 busy MacSoftphones WebConferencing Can You List All Known SIP Responses? SIP responses are the codes used by Session Initiation Protocol for communication. We have put together a list of all the SIP responses known. 1xx = Informational SIP Responses 100 Trying - Extended search is being perform so a forking proxy must send a 100 Trying response. 180 Ringing - The Destination User Agent has received the INVITE message and is alerting the user of call. 181 Call Is Being Forwarded - Optional, send by Server to indicate a call is being forwarded. 182 Queued - Destination was temporarily unavailable, the server has queued the call until destination is available. 183 Session Progress - This response may be used to send extra information for a call which is still being set up. 199 Early Dialog Terminated - Send by the User Agent Server to indicate that an early dialog has been terminated. 2xx = Success Responses 200 OK - Shows that the request was successful 202 accepted - Indicates that the request has been accepted for processing , mainly used for referrals. 204 No Notification - Indicates that the request was successful but no response will be received
message. You get a response. In some situations, you may even get several responses for a single message. Case in point is an INVITE transaction. A single INVITE request typically receives three responses and it’s not impossible for it to receive more. However, with most other SIP requests, a single response is received for every message sent. A SIP response is more than simply an acknowledgement to a request. It can, and often does, carry a lot of useful information from the user agent server (UAS) back to the user agent client (UAC). For instance, a 200 Ok typically carries session description protocol (SDP) and therefore a list of codecs that the UAS supports. A 302 Moved Temporarily provides next-hop routing information. A 401 Unauthorized is used to pass the data needed to encrypt a UAC’s credentials. Response messages fall into one of six types and those types are subsequently divided into two categories. The categories are either Provisional or Final. The types are identified by a three-digit number where the first digit indicates the class of the response. There is also human readable text associated with every response code. This Reason Phrase is never processed by a SIP stack. It’s simply there for you to read. SIP stacks deal only with the three-digit number. Several Provisional responses can be sent by the UAS up to the point of session establishment. Provisional responses begin with a 1. Final responses begin with a 2, 3, 4, 5, or 6. A single Final response indicates that the session has been established (success) or the session never will be established (redirection or error). For example, 182 Queued is a Provisional response. I know that because the leading digit is 1. The UAC might receive several 182 Queued responses as the call goes through various levels o