Aastra

The Aastra 536M expansion module is designed to increase the power and flexibility of the 5i Series SIP telephones. Up to three modules can be used with the 55i, 57i or 57i CT telephone to create a powerful, feature rich console option.

VOIP Telephone. General business use. Full duplex speakerphone. 10/100 Ethernet switch built in. PoE or local power.