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Enterprise SIP Trunk

The SIP trunk connection is available on the Enterprise plan only. On other plans the feature is visible but locked — contact sales to upgrade.
Connect your own SIP trunk to Ned so your existing telephony carries the calls — bypassing our per-minute PSTN cost — while inbound calls still reach your AI agent exactly as they do today.

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How it works

Your SIP trunk sends calls to a dedicated, IP-authenticated SIP connection we provision for your account. That connection is bound to Ned’s voice engine, so an inbound trunk call arrives as a normal inbound call and the AI assistant starts on the leg — no change to how your agents behave.

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Prerequisites

To connect a SIP trunk you’ll need:
  • One or more static public IPv4 addresses for your SIP infrastructure — connections are authenticated by IP allowlist. CIDR ranges and dynamic IPs are not supported; each source must be a single IPv4 address.
  • TLS 1.2 or 1.3 for SIP signaling and SRTP for media (encrypted end-to-end).
  • A trunk that supports at least one of the following codecs: G.722, G.711 µ-law (PCMU), G.711 A-law (PCMA), G.729, Opus.
  • You operate your own SIP trunk and carrier; Ned does not resell the underlying telephony.

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What it does — and doesn’t — save

The savings are on telephony only — the per-minute PSTN cost your trunk replaces. The AI/media portion of a call (speech-to-text, the model, and text-to-speech) is still billed as usual. SIP is economical for high-volume traffic; for low usage a standard number is usually cheaper.

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Setting it up

  1. On the Enterprise plan, open Phone Numbers and find Enterprise SIP trunk.
  2. Enter your static source IPv4 address(es) (one per line) and select Connect SIP trunk.
  3. Point your SIP trunk at the connection details we provide and place a test call to confirm it reaches your agent.
  4. To change the allowlist later, use Edit IPs; to remove the trunk, use Disconnect.

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Security

  • IP authentication — only calls from your allowlisted IPs are accepted.
  • Encrypted signaling + media — TLS + SRTP.
  • Standard anti-toll-fraud protections apply; outbound is rate-limited per source IP.