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Aastra SIP Phones


Aastra SIP

Session Initiation Protocol (SIP) is an IETF-defined signalling protocol used mainly for controlling voice and video communication sessions over Internet Protocol (IP). Also known as VoIP phones or soft phones, SIP phones allow phones calls to be made using VoIP (Voice over Internet Protocol) technology.

The Aastra SIP phone range offers its enterprise customer a wide range of SIP phones which make up the product ranges – the 673xi and the 675xi. For more details of each Aastra SIP phone range, follow the links below:

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