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SRST Fallback

I recently upgraded my srst gateway (2901) IOS version 15.0.1 to maintain compatibility with our current CUCM version (7.1.3). After the upgrade I began testing srst functionality and only four of my 10 phones registered with the srst gateway. I tested again and now none of my phones will register with the srst gateway. I have not changed the router configuration, the device pools or srst reference since the first test. I remained patient for about 6 minutes before I re-established WAN connectivity. Why would phones register with srst once, but then fail to register again after another WAN disconnect? Another interesting point, I noticed that when the phones registered with SRST the first time it was when I re-established connectivity to the WAN. Any help would be greatly appreciated.

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