iphone - Reachbility in ios does not give callback when wifi access point switches -

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i new ios. developing voip application. in application need callback when device ip address changes. have added reachability code in application. when go in wifi settings in iphone , cconnect wifi router other connected router. gives reachability callback. not give callback. why happen? code of reachability buggy? please tell me if doing wrong. in advance.


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