To use a Twilio Elastic SIP Trunk with Edesy, register it as an IP-authenticated carrier whose gateway is your trunk's Twilio termination host, with numbers sent in E.164 with a leading +. On the Twilio side, allow Edesy's IP for termination and add an origination URI pointing to Edesy, so calls flow both ways.

Values#

Setting	Value
Auth to Twilio	IP access control list (no registration)
Gateway	`<your-trunk>.pstn.twilio.com`, port `5060`, UDP
Number format	E.164 with `+` (`e164_leading_plus: true`)
Edesy SIP address for Twilio origination	Given to you during onboarding, port `5070`

1. Register the carrier on Edesy#

curl -X POST https://voice-api.edesy.in/v1/trunk-portal/trunks \
  -H "Authorization: Bearer sk_YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Twilio",
    "e164_leading_plus": true,
    "host": "your-trunk.pstn.twilio.com",
    "port": 5060,
    "protocol": "udp",
    "numbers": ["+1XXXXXXXXXX"]
  }'

2. Configure the Twilio trunk#

In the Twilio console, open your Elastic SIP Trunk:

Termination (Edesy to Twilio): note the termination SIP URI (this is your gateway host) and add Edesy's signalling IP to an IP Access Control List on the trunk.
Origination (Twilio to Edesy): add an origination URI of sip:<edesy-sip-address>:5070, using the address from onboarding.
Numbers: attach the numbers you listed in step 1 to the trunk.

3. Test#

Outbound: POST/v1/calls with from set to one of your Twilio numbers.
Inbound: dial the Twilio number. The call should arrive at Edesy and run the application linked to the number.

FAQ#

Why IP auth instead of credentials?#

Twilio Elastic SIP termination supports IP access control lists, which avoids per-call passwords. Twilio also supports credential lists; if you use one, set requires_register and the register fields instead.

My outbound calls get 403 from Twilio.#

Edesy's IP is not in the trunk's IP Access Control List, or the caller ID is not a number on your Twilio account.

Inbound calls never reach Edesy.#

Check the origination URI, including port 5070, and that the number is attached to the trunk.

See Bring Your Own Carrier for how routing works.