Download CallTTY TDD software 2.35
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The program is distributed as Shareware. You may use it for evaluation purposes during 30 days. If you wish to continue using this software after the evaluation period, you must make a registration payment to author. Unregistered copy of CallTTY have some abilities disabled.
Registered copy may either be used by a single user who uses CallTTY personally on one or more computers, or installed on a single computer used by multiple people, but not both.