作者: Lee J. Whritenour , Thomas C. Blum , Richard L. Harvey
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摘要: Wireless telephone networks, such as cellular, PCS and other mobile radio services networks provide 911 or similar emergency calling between stations a public safety answering point (PSAP). In situations, the caller often will not be satisfied with quality of link to PSAP, for any variety subjective reasons. case, ends first call initiates another call. accord invention, if second within predetermined interval from call, station select an alternate operating system network For example, utilized A-side cellular carrier, handset B-side carrier The also may different technology, e.g. analog instead normally preferred digital, expectation is that conditions on service subjectively finds more acceptable.