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Closed groups, T9 dial codes, why your phone shows a digit instead of a name.

Set up the softphone, create groups, invite people, rename your nickname.

Quick answers to the things people ask most often.

Softphone won’t register, no audio on calls, invite errors.

Practical habits to keep your account, invites, and calls private.

The stack, the protocols, and the cryptography that runs T9phone.