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We also support various SIP clients for the Apple iPhone the tested device we would recommend is the Acrobits GroundWire. It has all of the great features of Acrobits' free Softphone as well as business caliber features including transfer and attended transfer, call waiting and call conferencing.
For further information on our SIP Trunks please contact us or speak to one of our Sales Team on 0800 101 7000