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504 Server Time-out The server attempted to access another server in attempting to process the request, and did not receive a prompt response. [1]: §21.5.5 505 Version Not Supported The SIP protocol version in the request is not supported by the server. [1]: §21.5.6 513 Message Too Large
SIP employs design elements similar to the HTTP request and response transaction model. [12] Each transaction consists of a client request that invokes a particular method or function on the server and at least one response. SIP reuses most of the header fields, encoding rules and status codes of HTTP, providing a readable text-based format.
408 Request Timeout The server timed out waiting for the request. According to HTTP specifications: "The client did not produce a request within the time that the server was prepared to wait. The client MAY repeat the request without modifications at any later time." 409 Conflict
If the stop time is 0 then the session is unbounded. If the start time is also zero then the session is considered permanent. Unbounded and permanent sessions are discouraged but not prohibited. Intervals can be represented with NTP times or in typed time: a value and time units (days: d, hours: h, minutes: m and seconds: s) sequence.
SIP defines two modes of instant messaging: The Page Mode makes use of the SIP method MESSAGE, as defined in RFC 3428. This mode establishes no sessions. The Session Mode. The Message Session Relay Protocol (RFC 4975, RFC 4976) is a text-based protocol for exchanging arbitrarily-sized content between users, at any time. An MSRP session is set ...
In the basic SIP specification, [15] only requests and final responses (i.e. 2XX response codes) are transmitted reliably, this is, they are retransmitted by the sender until the acknowledge message arrives (i.e. the corresponding response code to a request, or the ACK request corresponding to a 2XX response code).
While a proxy usually keeps only state information related to active transactions, B2BUAs keep state information about active dialogs, e.g., calls. That is, once a proxy receives a SIP request it will save some state information. Once the transaction is over, e.g., after receiving a response, the state information will soon after be deleted.
A SIP address is written in user@domain.tld format in a similar fashion to an email address.An address like: sip:1-999-123-4567@voip-provider.example.net. instructs a SIP client to use the NAPTR and SRV schemes to look up the SIP server associated with the DNS name voip-provider.example.net and connect to that server.