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Agents you build on Wixzel Voice place and answer phone calls over a SIP trunk you bring, and a Telnyx SIP Connection is one of the carriers that works with it. Telnyx bills you for the trunk and the minutes at your own rates; the voice engine is billed per second of actual usage from your Wixzel Voice balance. This page covers where Telnyx keeps each setting. The steps that are the same for every carrier, and the troubleshooting list, are on SIP trunks.
Allowlist 187.126.120.231 for outbound calls, and send inbound calls to sip:187.126.120.231:5090. Every trunk returns both as platform_ip and origination_uri, so read them from GET /v1/sip-trunks rather than trusting this page to stay current.

How do I connect a Telnyx SIP Connection to Wixzel Voice?

Both directions go through one Telnyx SIP Connection.
1

Create an IP-authenticated SIP Connection

Mission Control → SIP Connections, then set the connection type to IP authentication rather than credentials or FQDN registration.
2

Add the platform IP under Outbound

Add 187.126.120.231 as an authorised address. Telnyx lets you list several with priorities and tries them in order.
3

Pick an inbound SIP region

Telnyx asks for one explicitly for IP and FQDN authentication. Left unset it is derived from your AnchorSite, which is rarely what you meant.
4

Set the transport to match your trunk

Telnyx delivers over UDP by default. If your Wixzel Voice trunk sets transport to tcp or tls, change the SIP Transport Protocol on the connection to match, or the two ends will not agree.
5

Point the number at the connection

Assign your numbers to this connection so inbound calls reach it, then give the number an inbound_agent_id in Wixzel Voice so there is an agent to answer.
Telnyx expects the leading +, so leave send_plus at its default.

What if a Telnyx call does not connect?

Work through When a call does not connect, and start with Telnyx’s own call logs: they show whether the call reached Telnyx at all and how Telnyx cleared it.

Can I buy a Telnyx number from Wixzel Voice?

Yes. With Telnyx connected in one step, open Phone numbers and choose Buy a number, or use POST /v1/phone-numbers/purchase. Telnyx charges your account, and the order puts the number on the connection we made. Regulated countries need an approved requirement group; if your account has one for that country and number type it is used. Orders usually finish within seconds; a slower one comes back as pending. Telnyx sells Indian mobile numbers in four telecom districts: Mumbai, Gurugram, Noida and Bangalore. They need an address in one of those districts and Indian business KYC, held as a requirement group on your Telnyx account. The connection we make keeps call audio in Telnyx’s Mumbai site, next to our servers, so calls between Indian phones stay in India.
  • SIP trunks: the allowlist, the inbound address and the troubleshooting list that apply to every carrier.
  • Quickstart: connect the trunk, register a number, create an agent and place a first call.
  • Telnyx SIP trunk setup: the short version on the Wixzel Voice site, with what a minute costs on each voice engine.