Setting how long iPhone rings before going to voicemail

By default, the iPhone rings 15 seconds before going to voicemail.  I wanted to make this a little longer so that I could use the Vonage SimulRing feature without my cell phone’s voicemail answering before the Vonage voicemail would answer.  Unfortunately there is no setting I could find in the iPhone interface to change this, but luckily I found a forum post explaining this.

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