Use PRI card to intergrate your TDE200 to a SIP server so you can use some SIP Phones if you need expansion on your TDE200.
License may be hard to get now
You will need another PBX that supports SIP. E.g Sangoma or OpenSource Asterisk/FreePBX.
Additionally, you will need a PRI30 card on the TDE200 and a PRI port or Gateway to interface with the TDE200. the rest is the configuration
Am attaching a similar project i did for your understanding.
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