Call Masking Company Wide
I would like to suggest making the number masking feature available company wide for all extensions and users.
By enabling Phone Masking for all users, you can ensure that all outgoing calls appear to be coming from the main company number. This not only enhances the security of your communication channels but also safeguards the personal and direct phone extensions of your personnel from being displayed to external parties.
One of the key benefits of Phone Masking is that it reduces the frequency of outside customers calling an extension directly, bypassing the switchboard. This feature is designed to streamline the call routing process, ensuring that customers are guided to the right person for customer service and the appropriate department for their specific inquiry.
Please allow us to Empower our team to communicate securely and efficiently with our Phone Masking feature being made available company wide on RingCentral. Allow us to elevate our customer service experience while maintaining the confidentiality of our internal communications.

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Kyle commented
You may be able to achieve this by applying a user template and updating the outbound caller ID settings there. Looks like you can choose through the restriction settings to only allow the company # to be used as the Caller ID.