transaction
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... Since SIP is used for the establishment of interactive communications
services, the time it takes to complete a transaction between a
caller and called party is important. Typically, the time from when
...
...
It is possible for elements to fail in the middle of a transaction.
For example, after proxy 2 forwards the request to UA ...
... the request is to be sent.
The procedures here MUST be done exactly once per transaction, where
transaction is as defined in [1 ...
... The procedures here MUST be done exactly once per transaction, where
transaction is as defined in [1]. That is, once a SIP server has
...
... ACK request for 2xx responses to INVITE constitutes a
different transaction, there is no requirement that it be delivered
to the same server that received the original request (indeed, if
...
... connection failures in TCP).
Failure also occurs if the transaction layer times out without ever
having received any response, provisional or final (i.e., timer ...
... has a different value of the Via branch ID than the previous (and
therefore constitutes a new SIP transaction). That request is sent
to the next element in the list as specified by RFC 2782prop ...
... server is contacted successfully, all retransmissions of the request
for the transaction, as well as ACK for a non-2xx final response, and
CANCEL requests for that transaction ...
... transaction, as well as ACK for a non-2xx final response, and
CANCEL requests for that transaction, MUST go to the same server.
The identity ...
... The identity of the successfully contacted server is a form of
transaction state. This presents a challenge for stateless proxies ...
... which still need to meet the requirement for sending all requests in
the transaction to the same server.
The problem is similar, but different, to the problem of HTTP ...
... The problem is similar, but different, to the problem of HTTP
transactions within a cookie session getting routed to different
...
... proxies is at a lower layer; it is retransmitted
requests within a transaction that are being potentially spread
across servers. Since none of these retransmissions carries a
...
... DNS TTLs expire in the
middle of a transaction, and the entries had changed. This is
unavoidable. Network implementors ...