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MULAP Feature for SIP-endpoints Disclosure Number: IPCOM000019965D
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 Request For Comment (RFC), for example. Like others it is based on the Session Initiation Protocol (SIP) in accordance with the standard RFC3261 by the Internet Engineering Task Force (IETF). In contrast to non-SIP-phones the SIP-endpoints (phones or software-clients connected to an Internet Protocol based network via SIP-signaling) have not been able to use any MULAP (Multiple Line Appearance) -functionality so far. The following text outlines a method to transport a MULAP-functionality, the so called 'Buddy Group' feature, to a SIP-platform. A Buddy Group is a collection of subscribers. Calls made to the group (by calling the group number) are signaled to all members. Similarly, when group members make calls to a subscriber who is not member of the group, the calling party can choose if the called party will be informed about the group number or about the individual number. Furthermore, the group members have additional capabilities to handle intra-group calls like call transfer, call hold, bridging, etc.