links for 2009-12-16

• This suggestion on how the iPhone handles signaling is interesting and another reason perhaps for the notification server.
  "told Ars that the problem isn't the cell radio hardware, nor the network infrustructure, but an issue with the way that the iPhone OS conserves power. All iPhone apps, including Phone.app, cause the radio to switch from "active" to "idle" mode when accessing the network far more often than traditional phones do. This causes the signaling channel, responsible for such functions as SMS messaging, initiating, maintaining, or ending a phone call, voicemail notifications, and DHCP requests, to become overloaded."
  (tags: iphone att voip signals dialtone apple)

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