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Agents you build on Wixzel Voice place and answer phone calls over a SIP trunk you bring, and Exotel Virtual SIP Trunking is one of the carriers that works with it. Exotel 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 Exotel keeps each setting. The steps that are the same for every carrier, and the troubleshooting list, are on SIP trunks.
Allowlist 95.216.218.102 for outbound calls. Exotel delivers over TCP, so send inbound calls to 95.216.218.102:5091, the TCP port, rather than the 5090 in origination_uri, which is the UDP port. Every trunk returns the address as platform_ip and origination_uri, so read it from GET /v1/sip-trunks rather than trusting this page to stay current.
Inbound calls over Exotel have not been verified end to end yet.

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How do I connect an Exotel SIP trunk to Wixzel Voice?

Exotel’s trunking product is Virtual SIP Trunking (vSIP), aimed at Indian numbering. It does not take UDP: use TCP with Wixzel Voice.
1

Set the transport on your Wixzel Voice trunk

Exotel publishes pstn.in4.exotel.com:5070 for TCP. Set host to pstn.in4.exotel.com, port to 5070 and transport to tcp on your Wixzel Voice trunk; leaving it on UDP will not connect.
2

Whitelist the platform IP

Exotel whitelists through a Map ACL to Trunk API call rather than only through the dashboard, and the dashboard is limited to one IP range. For more, their documentation directs you to contact them.
3

Set the Destination URI for inbound

Exotel’s name for the origination side is the Destination URI. Point it at 95.216.218.102:5091 over TCP. origination_uri reports 5090, the UDP port, which Exotel does not use.

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What else stops an Exotel call in India?

Some markets gate outbound calling behind identity checks. In India in particular, an account that has not finished KYC (and, for many providers, DLT registration) can hold a positive balance and still have every outbound call cleared immediately. The portal shows the calls; it does not always show the reason. If an Exotel call fails some other way, work through When a call does not connect.
  • 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.
  • Exotel SIP trunk setup: the short version on the Wixzel Voice site, with what a minute costs on each voice engine.