
60
SIP reliability: INVITE
retransmit request after 0.5, 1, 2, 4, 4, 4, 4 seconds
until provisional or final response
client confirms final response via ACK ➠
1.
: INVITE
2.
: 100, user location, ringing, . . .
3.
: 200
4.
: ACK
server repeats final response (as above) if no ACK
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