Any call using Australian phone numbers (+61) as calling number not allocated by ACMA will be blocked.Any call using anonymous as the calling number will be blocked.For more details, please visit the Telstra Australian Caller ID Restrictions Support page.

To maintain service continuity, all Twilio users calling Telstra Australian destinations using Telstra Caller IDs will need to use Twilio Phone Numbers. By November 30, 2021, Telstra is expected to begin implementing restrictions on calls terminating at its network in order to reduce scam calls.Phone numbers provisioned on Twilio or ported to Twilio and used as the calling number have the lowest risk of being impacted by the code. Calls originated by Twilio to Australian destinations should use a Twilio phone number as the Calling Number (also called CLI, From Number, or CallerId).Per the Reducing Scam Calls Code, published in November 2020, the following guidelines are best practices to reduce your risk: Calling use cases like call forwarding that require the originating service provider to originate a call using a phone number hosted by another provider is protected under the code. The obligations of the code fall on the originating service provider. Twilio participates with the Communications Alliance WC92 Reducing Scam Calls Sub-Group in order to ensure legitimate voice calling use-cases are protected and join the industry to eliminate scam calls.

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