I do not have anything configured to dial 18xx numbers. It just works for me. But instead of smart dial, try Voxalot as a voice service provider.
As for a free SIP provider, I still use Google Voice, but I use SipBri.com as a Google Voice SIP gateway. Once I have my Google Voice account configured at SipBri.com, I use the SipBri account as one of Voxalot's voice service providers. Works well, I might add.
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