Voice APIs & SIP Trunking · Vendor file
SignalWire
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FreeSWITCH-founded; low-level voice APIs with LAML scripting and competitive rates
Active · verified September 2026
Categories SignalWire serves
The B4 Index places SignalWire in one category. Each category page lays out the build-versus-buy considerations for that decision.
Voice APIs & SIP Trunking From ~$0.005/min; DIDs from $0.08/mo
The B4 Index scores every software category on two axes, strategic differentiation and AI feasibility, to
classify it Build, Buy, Bridge, or Beware. Vendor facts here are independent of that call. See the full
methodology.