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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 ...
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.
The range header is used by HTTP clients to enable resuming of interrupted downloads, or split a download into multiple simultaneous streams. 207 Multi-Status (WebDAV; RFC 4918) The message body that follows is by default an XML message and can contain a number of separate response codes, depending on how many sub-requests were made.
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.
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.
Linux Netfilter's SIP conntrack helper fully understands SIP and can classify (for QOS) and NAT all related traffic Netopia Netopia supports ALG PF , built-in OpenBSD firewall PF can handle the NAT through the "static-port" directive and the bandwidth control through the built-in queuing system of SIP connections
These two extensions allow users to specify their preferences about the service the IMS provides. With the caller preferences extension, [8] the calling party is able to indicate the kind of user agent they want to reach (e.g. whether it is fixed or mobile, a voicemail or a human, personal or for business, which services it is capable to provide, or which methods it supports) and how to search ...
SIP is a simple protocol in which requests to perform operations are sent over a connection, and responses are sent in return. The protocol explicitly does not define how a connection between the two devices is established; it is limited to specifying the format of the messages sent over the connection. [ 4 ]