The default Caller ID for outbound calls from Twilio is to display an E.164 formatted phone number at the destination. In most cases, this will be the Twilio phone number or verified phone number used in the From parameter in your API request, or the callerId attribute of your <Dial> verb.
This guide covers what to expect for Caller ID in the following scenarios:
- Outbound calls with a verified phone number
- Outbound calls within the same country
- Outbound calls to other countries
- Caller ID for incoming calls
Outbound calls with a verified phone number
When a non-Twilio phone number (landline, office phone, etc.) gets verified on your account, it can be used for outbound API and <Dial> calls. If this phone number has an existing CNAM Caller ID entry, this entry is usually the default Caller ID displayed. Outbound calls placed over Twilio using this verified number should be indistinguishable from calls placed normally from this line.
To place calls using this method, simply use the verified phone number in E.164 formatting in your call request code. For more details, see Using a non-Twilio number as the caller ID for outgoing calls.
Notice: To edit or remove an existing CNAM Caller ID entry for a verified phone number, please contact your service provider.
Outbound calls within the same country
When placing calls from a Twilio number in the same country as the To number, the Caller ID defaults to the E.164 formatted From or callerId number specified in your request. If the Twilio number used is a US or Canada number and has a CNAM registered, the CNAM will display on the receiving parties line. For more details on registering or updating CNAM on a Twilio number, see Getting Started with CNAM Caller ID.
Notice: CNAM Caller ID is only supported by carriers in the US, and some carriers in Canada.
Outbound calls to other countries
Standard caller IDs may not be rendered properly when a calling out to a To number in a different country than the From number. In some cases, the From number may be changed, or a different alphanumeric caller ID added to ensure international delivery. For full details, please see our article on International Caller ID.
Caller ID for incoming calls
Most calls coming in to your Twilio number will default to showing the callers E.164 phone number as the Caller ID.
- Some calls may have the Caller ID altered, or display a restricted number code. For more details, see Caller IDs of Incoming Calls are Incorrect.
- Twilio offers an automatic CNAM Caller ID lookup feature for Programmable Voice and Elastic SIP Trunking calls. For more details, see Getting Started with CNAM Caller ID.
- We also offer a number of Caller ID add-ons from multiple providers. These can be found in the Twilio Marketplace in Console.