Session initiation protocol retransmission method

摘要

For a network server ( 35 ) communicating with a wireless unit ( 10 ) via a Session Initiation Protocol, a retransmission method ( 50 ) first sets a timer based upon a time likely for a mobile unit to respond ( 54 ). Then the network server waits for a response ( 56 ). When the timer set for the kind of mobile unit being used expires ( 64 ), a retransmit of the original SIP request takes place ( 68 ). Optionally, modes for waiting may include a linear mode ( 72 ) and an exponential mode ( 74 ).