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Documentation Index

Fetch the complete documentation index at: https://documentation.uponai.com/llms.txt

Use this file to discover all available pages before exploring further.

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Setup Steps

1

Create Elastic SIP Trunking in Twilio

In your Twilio Console, create a new SIP trunk and give it a name.Configure Termination (outbound):
  • Note the Termination SIP URI — you’ll use it when importing numbers to UponAI. Use a localized URI near your region for best performance.
  • To allow UponAI’s outbound requests, either:
    • Whitelist UponAI’s SIP CIDR block: 18.98.16.120/30
    • OR create auth credentials (username + password) — you’ll supply these when importing to UponAI
Configure Origination (inbound):
  • Set the origination SIP URI to: sip:sip.retellai.com
2

Move numbers to your SIP trunk

Purchase new numbers or move existing Twilio numbers to the elastic SIP trunk you just created.
3

Import numbers to UponAI

In the UponAI dashboard, import the number by supplying:
  • The Termination SIP URI from Step 1
  • Username and password (if you chose credential auth)
You can also import numbers programmatically via the Import Number API.Once imported, the number behaves exactly like a UponAI-purchased number — it appears in your dashboard and can make and receive calls. To remove it, delete it from the dashboard or via the Delete Number API.

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Common Issues

Inbound works but outbound doesn’t:
  • Check the Termination SIP URI for any spaces — remove them
  • Use a localized Termination SIP URI near your region
  • Double-check your username and credentials. The username is different from the friendly name shown in the credential list — verify the actual username, not the display name
Calling international countries:
  • In Twilio Console, search “geo” to find Voice Geographic Permissions
  • Select Elastic SIP Trunking and enable the countries you want to call

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Phone Number Masking (Caller ID)

Display a verified personal or business number as the caller ID for outbound calls.
1

Add a verified caller ID

  1. Go to Verified Caller IDs in Twilio Console
  2. Click Add a new Caller ID
  3. Enter the phone number, choose a verification method, and click Verify Number
  4. Enter the OTP code you receive to complete verification
2

Configure SIP header rules

  1. In Twilio Console, navigate to Elastic SIP Trunking → Trunks → [your trunk] → Termination
  2. Scroll to Header Manipulation and click View all SIP header manipulation policies
  3. Click Create a policy and give it a name
  4. Click + Add request rule and configure:
    • SIP header field: From number
    • Action: Replace with
    • Value: Your caller ID in E.164 format (e.g. +18881230987)
  5. Click Add rule, then Save policy
  6. Back on the Termination tab, select your new policy from the dropdown
You need at least one number purchased from Twilio in your SIP trunk for the caller ID to be applied. Test with an outbound call to validate.