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@tomas_ Its a requirement for STIR/SHAKEN

Version 5.1.48 | Hosted | 2600hz Carrier

SmartPBX > User > User Features > Caller ID > Number Drop Down > Add New Caller ID

Adv Callflow > Users > Select User > Outbound Caller ID Number Drop Down > Add New Caller ID

Number Manager > Caller ID Numbers Tab > Add