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Exceptional Features and Value in a Basic Level IP Telephone
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The 536M expansion module is designed to increase the power and flexibility of the 5i Series SIP telephones.
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The Aastra 53i offers powerful features and flexibility in a standards based, carrier-grade basic level IP telephone.
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The Aastra 55i offers powerful features and flexibility in a standards based, carrier-grade advanced level expandable IP telephone.
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The 536M expansion module is designed to increase the power and flexibility of the 5i Series SIP telephones.
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Features and Value in a Fully
Featured, Expandable IP Telephone
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Exceptional Features and Value in a Fully Featured, Expandable, Mobile IP Telephone
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