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The 4DTR and 8DTR cards contain four or eight dual tone multi-frequency (DTMF) receiver circuits, respectively. The cards are generally used to allow the use of tone dial single-line telephone sets, DTMF signaling over E&M and Direct Inward Dial (DID) trunks, and Direct Inward System Access (DISA) over central office trunks.
- Mfr. Part #: 449428100
- Tadiran Coral IPx 4DTR/S DTMF Receiver Circuit Card
- Condition: Refurbished
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