Patent ID: 8306198

Claim:
A communication system comprising: a plurality of extension telephones, a private branch exchange receiving a mail including a mail address over a network and transfers the mail, and a computerized device disposed corresponding to said private branch exchange, said extension telephone including a notifier that said extension telephone has a message to be confirmed, wherein said private branch exchange includes: an interface configured to communicate with the network; a mail server configured to receive and store the mail; an extension interface configured to exchange a communication signal including an audio signal and a control signal with said extension telephones; a first database configured to store extension numbers of said extension telephones and receivable mailing addresses corresponding to the extension numbers; said computerized device having a destination address corresponding to the extension number of said extension telephone; a second database configured to store the extension numbers of said extension telephones and the destination address of said computerized device corresponding to the extension number of said extension telephone; an examining unit configured to detect whether or not the mailing address included in the received mail matches the receivable mailing address stored in said first database; and a controller operable for notifying the extension telephone of receiving of the mail, and for transferring the received mail to said computerized device having the destination address responsive to said examining unit judging that the mailing address included in the received mail matches the receivable mailing address stored in said first database, and cancelling notifying said extension telephone of receiving the mail in case that the mail is opened at said computerized device.