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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 ...
SIP is a text-based protocol, incorporating many elements of the Hypertext Transfer Protocol (HTTP) and the Simple Mail Transfer Protocol (SMTP). [3] A call established with SIP may consist of multiple media streams , but no separate streams are required for applications, such as text messaging , that exchange data as payload in the SIP message.
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.
MSRP can be used within a SIP session: to do instant messaging in a one-to-one or one-to-many mode; to do an attachment file transfer; to do some photo sharing (e.g., Image Share) based on prior exchange of capabilities between the user endpoints; MSRP session is set up through SIP's offer-answer [3] model.
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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 ...
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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