Depending on your VSP, it may already be possible to do that. I have an account with SIPME (and a DID that they provided at $5/pm) and they kindly routed the DID to voxalot rather than my SIPME account. So inbound calls to my DID get routed to Voxalot, then to my chosen VSP provider, which is a combination of SIPME and AstraTEL. My ATA is registered with Voxalot. So, inbound works, outbound works, voxalot dial plans work (Yah!) and e164 also works!!!
Quality is pretty much ok (have noticed a few things but it might have been SIPME or AstraTEL problems).
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