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Verotel has been reliable for a long time. That's important since billing companies come and go, taking your rebills with them. Although they have been at the top for a while, Ccbill continues to develop, adding new features and improving. I would therefore keep them as primary. Gxbill does by thr minute phone billing I believe, as does passwordbyphone. Dhd media has been reliable, though somewhat under the radar. They continue to improve, though they are in some ways the quickie mart to Ccbills Walmart.
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