I need to identify the CLEC responsible for handling calls placed from Sprint to VOIP carriers that include CallCentric and VOIPo. Local Sprint callers, over the years, have consistently experienced a very poor ringback tone when calling me. The ringback tone has been described as being very distorted, inconsistent in length, double-ring, etc. Sounds like they are calling the ends of the earth on the highest gauge copper wire found.
Any suggestions on identifying this carrier? Thanks.
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