UMTS call handling methods and apparatus
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United States of America Patent
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Jun 1, 2010
Grant Date -
Mar 30, 2006
app pub date -
Sep 19, 2005
filing date -
Sep 18, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
Methods and apparatus for transparently switching a local instance of a UMTS protocol-based call from a first card or module of a media gateway to a second card or module of the media gateway, such that the remote end of the call is not aware that the call has been switched between the first and second cards or modules. Moreover, initially establishing call media flow may include implementing two timers of different duration during which call-initialization is retried if no Positive-Acknowledgement of call initialization is received, where a shorter-duration timer is relied upon to attempt retries if a Negative-Acknowledgement is received, and a longer-duration timer is relied upon to attempt retries if neither a Positive-Acknowledgement nor a Negative-Acknowledgement is received.
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