I have installed few hundred asterisk phone systems and starting having this weird issues with Cbeyond dropping calls around 24 minutes for no apparent reason. I was having the issues with Elastix 2.2 and Elastix 2.3 (asterisk 1.8.7). It seemed like the RTP stream cut off by failing to repond to Cbeyond (Broadworks , Broadsoft). Cbeyond was virtually no help with this problem. I like the new Elastix 2.3 interface but needed to downgrade to asterisk 1.6 to correct this problem. Below is how I downgraded to Asterisk 1.6. Its very easy. If you are using IVR promps recorded in MP3 you have to redo them in Wav.
At the console do a:
[root@pbx ~]#yum downgrade asterisk
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