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Automatic Redirection of Fax Messages to the SIP-Endpoint in Buddy Groups

IP.com Disclosure Number: IPCOM000019958D
Original Publication Date: 2003-Nov-25
Included in the Prior Art Database: 2003-Nov-25

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Modern communication networks offer many features to their subscribers. One of these features can be the possibility of sending or receiving a fax message. If a fax message is sent to a fax device by an incorrect number or a malformed address, the message could not be delivered to the dialed subscriber (named subscriber B). The subscriber who tried to send the message (named subscriber A) will receive an error-note and has to resend the fax message by the correct number or address. Actually, if the (correct) number or address is unknown, the fax message cannot be delivered unless subscriber B is contacted in order to ask for the right number, for example. A new feature to solve this problem is proposed for subscribers who are connected to an Internet Protocol (IP) based network via SIP-Signaling (Session Initiation Protocol). The core of the idea is to introduce the fax device as a member of a so called 'Buddy Group' (class of subscribers), combined with the automatic redirection of a fax message which is sent to one of the Buddy Group members. For this purpose the content of the header 'content type' in the SIP has to be modified. The header will be checked for supported media types of the Buddy Group members and, if required, the message will be redirected to the Buddy Group member whose supported media type is congruent.