In order to use this IP telephone with your telephone system you will need a sound broadband connection.
If you only have a single circuit plug available (e. g. in home offices) but would like to access the Internet with your laptop while making calls with the telephone, you can connect the network cable (R145) to your telephone and thanks to the switch integrated in the telephone, simultaneously connect your laptop directly to the telephone (except Mitel (Aastra) 6730i).
Since October 1st, 2014 Aastra is renamed Mitel. All Aastra IP telephones were renamed to Mitel.
The Mitel 6753i is End of Life since July 1st 2015.