I myself had this problem when I registered two difference devices (a Sipura ATA and the X-lite softphone) with the same Voxalot account. When that account would get called, not always but frequently, there would be a period of a couple seconds, around 2-3, of silence. It was inconsistent when this happened, and I think it only happened to the Sipura and not to X-lite, and I think it only happened when my DID was called and not when receiving a direct SIP URI call (from for example Gizmo Project).
I found this problem was corrected when I stopped X-lite from registering as well, and only let the Sipura register.
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