US 8,284,923 B2Granted

Bridging messages to release enterprise ports

AssigneeMicrosoft Corporation

InventorNiraj Khanchandani

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Abstract

Architecture for bridging unwanted calls back to the PSTN (public switch telephone network) thereby freeing-up enterprise ports for other uses. When an incoming PSTN call is received into the enterprise via the PBX, a SIP server makes the decision to trigger bridging after obtaining the call reference and the interface on which the call exists. The SIP server sends a request to the PBX to trigger bridging. When the PBX determines it no longer needs to be involved, it sends the bridging request to the PSTN. More specifically, a mechanism is provided to trigger TBCT (Two B-Channel Transfer) from the SIP server thereby pushing call routing of unwanted calls out of the PBX and preserving PBX ports. The SIP server can retrieve the PSTN-related information from the PBX using either web services or a SIP-based protocol.

Claims16

Dependent claims

A system that facilitates call management, comprising:

a routing component, which comprises a session initiation protocol (SIP) gateway on which message ports are initially allocated, for receiving a multimedia message via a public switched telephone network (PSTN) interface, the PSTN-originated message destined for an enterprise recipient of an enterprise for termination in an enterprise;
a private branch exchange (PBX)/media server to request PSTN message information about the multimedia message from the PSTN interface related to routing of the message;
and
a session component for:
sending a request for PSTN message information of the PSTN to a SIP PBX gateway, the SIP PBX gateway to forward the request to the PSTN, and the session component to receive the PSTN message information from the PSTN via the PBX/media server and,
based on the message information, forwarding a bridge request to the routing component with a routing signal including the message information, the routing component operable to forward the routing signal to the PSTN interface to trigger bridging of the multimedia message in the PSTN rather than through the enterprise, by sending a routing signal from the PSTN interface to the PSTN to initiate a two B-channel transfer (TBCT) in the PSTN bridging the message in the PSTN, wherein the allocated message ports are subsequently freed up for reallocation based on routing of the message outside the enterprise.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/519,111Filed 11 Sep 2006
Published: US 2008/0075265 A127 Mar 2008
Granted: 9 Oct 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04M 3/42323
In private branch exchanges: pBX's with CTI arrangements
H04L 65/1053
Architectures or entities: iP private branch exchange [PBX] functionality entities or arrangements
H04L 65/1104
Session protocols: session initiation protocol [SIP]
H04M 3/54
Systems providing special services or facilities to subscribers: arrangements for diverting calls for one subscriber to another predetermined…