Telnyx
Telnyx is a global telephony platform. Often cheaper per-minute than Twilio for carrier services, with a strong direct-to-network footprint. SIP credentials are exposed through “SIP Connections” in the Mission Control portal — no support ticket needed.
What you’ll need from Telnyx
If you don’t have a Telnyx account yet, sign up and verify your billing details. Phone numbers and outbound calling require active billing.
Inside the Mission Control portal:
- Buy a phone number (Numbers → My Numbers → Buy Numbers) for inbound calls.
- Create a SIP Connection (Voice → SIP Connections → Add SIP Connection). Pick Credentials (not IP allowlist) as the authentication method — that’s what works with a softphone on a residential network.
- Set the SIP credentials on the connection. Telnyx generates a username and a password for you; both are distinct from your portal login. Hold onto both.
- Assign your phone number to the connection (Numbers → My Numbers → click your number → Connection or Inbound profile → pick the SIP Connection from step 2). Inbound calls now ring your softphone.
Fields for WaveKat Voice
| Field | Value |
|---|---|
| Provider | Telnyx (in the dropdown) |
| Account name | Anything — e.g. Telnyx main |
| Username | The SIP Connection username from step 3 |
| Domain | sip.telnyx.com (pre-filled by the preset) |
| Password | The SIP Connection password from step 3 |
The Telnyx preset is configured with auth_username_hint: "separate" — the auth username and the SIP username are the same string on Telnyx, but the field stays available in Advanced in case you re-issue credentials and want to override one without touching the other. Other Advanced fields stay at defaults: UDP, port 5060, 60-second refresh.
Test it
After saving, the green dot on your Telnyx account chip on WaveKat Voice’s Home screen confirms you’re registered. Telnyx doesn’t publish a public echo number, so:
- Call your own Telnyx number from another phone — WaveKat Voice should ring.
- Or call a known good destination (a friend’s mobile) and confirm two-way audio.
For programmatic outbound testing, Telnyx’s Programmable Voice quickstart shows how to set up a call control application; not needed for everyday softphone use.
Common gotchas
403 Forbiddenon sign-in: Telnyx is rejecting based on the SIP Connection’s authentication settings. Confirm you picked Credentials (not IP allowlist) and that the connection is in the Active state.401 Unauthorizedon sign-in: wrong password. Telnyx generates passwords on connection creation; if you didn’t capture it, re-issue from the SIP Connection’s Authentication tab.- Calls go out but the called party can’t hear you (one-way audio): common Telnyx + symmetric-NAT issue. Try switching the Connection to TCP (Advanced → Connection in WaveKat Voice; matching change on the Telnyx side) or enable Telnyx’s media handling for NAT traversal under the Connection settings.
Pricing
Telnyx’s pricing page is authoritative. As of writing: outbound to US is around $0.0050–$0.0070/min, US local numbers are $1/month. Often the cheapest of the global SIP providers for high-volume use, particularly for international carrier rates.