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SIP requests and responses may be generated by any SIP user agent; user 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 for different transactions: [ 1 ] : p26 for example, a SIP phone is a user agent that will be a UAC when ...
File system These replies indicate the status of the Server file system vis-a-vis the requested transfer or other file system action. Below is a list of all known return codes that may be issued by an FTP server.
The client has asked for a portion of the file (byte serving), but the server cannot supply that portion. For example, if the client asked for a part of the file that lies beyond the end of the file. Called "Requested Range Not Satisfiable" previously. [16]: §10.4.17 417 Expectation Failed
The Session Initiation Protocol (SIP) is a signaling protocol used for initiating, maintaining, and terminating communication sessions that include voice, video and messaging applications. [1] SIP is used in Internet telephony, in private IP telephone systems, as well as mobile phone calling over LTE . [2]
This provides the actual SIP extensions for subscriptions, notifications and publications. RFC 6665 defines the SUBSCRIBE and NOTIFY methods. SUBSCRIBE allows users to subscribe to an event on a server, the server responds with NOTIFY whenever the event occurs. RFC 3856 defines how to make use of SUBSCRIBE/NOTIFY for presence.
A packet-switched network transmits data that is divided into units called packets.A packet comprises a header (which describes the packet) and a payload (the data). The Internet is a packet-switched network, and most of the protocols in this list are designed for its protocol stack, the IP protocol suite.
During large file transfers, the control connection may remain idle. An ALG can prevent the control connection getting timed out by network devices before the lengthy file transfer completes. [3] Deep packet inspection of all the packets handled by ALGs over a given network makes this functionality possible. An ALG understands the protocol used ...
The following tables compare general and technical information for a number of File Transfer Protocol (FTP) clients. Unless otherwise specified in footnotes, comparisons are based on the stable versions without any add-ons, extensions, or external programs.