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Aastra M670i (536M) 36-Key Expansion Module (A1736-0000-10-55)
The M670i expansion module is designed to increase the power and flexibility of the AastraLink RP Series telephones. Up to three modules can be used with the 6753i RP or 6757i CT RP telephones to create a powerful, feature rich console option. The M670i shares power and signaling with the phone, eliminating the need for additional wiring.
Features: