Inter-site call routing and roaming support
First Claim
1. A method for facilitating call routing in an enterprise having a first site capable of connecting to a second site in the enterprise through a network associated with the enterprise, the network operating according to a network protocol, the method comprising:
- registering at least a first plurality of identifiers and a first site identifier associated with the first site with a inter-site router operating in accordance with a protocol compatible with the network protocol; and
routing a call request received at the second site to the inter-site router over the network in accordance with the network protocol and the protocol compatible with the network protocol when an identification number associated with the call request is not recognized at the second site such that the inter-site router can forward the call request to the first site using the first site identifier when the identification number associated with the call request matches one of the first plurality of identifiers.
2 Assignments
0 Petitions
Accused Products
Abstract
A method (600,700) and apparatus (800) are arranged and operate for facilitating call routing between sites in an enterprise connected by a private IP network (130). A range of identifiers (220-223) served by IP PBXs (120-123) in the enterprise may be registered with a SIP registrar (212) of an inter-site router (210). Call requests to a communication unit (350) outside the home site are routed to the SIP registrar. A site identifier associated with the destination IP PBX allows the call to be completed by the SIP Proxy or the IP PBX where the call was received. When no private IP network is available, a roaming CU registers with a cellular proxy in the visited network. Calls are routed by when an HLR (340) associated with the CU obtains the roaming number from the cellular proxy (330) in the visited site. The MSC completes the call to the visited IP PBX using the roaming number and a local SIP registrar 440 forwards the call to the CU.
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Citations
24 Claims
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1. A method for facilitating call routing in an enterprise having a first site capable of connecting to a second site in the enterprise through a network associated with the enterprise, the network operating according to a network protocol, the method comprising:
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registering at least a first plurality of identifiers and a first site identifier associated with the first site with a inter-site router operating in accordance with a protocol compatible with the network protocol; and
routing a call request received at the second site to the inter-site router over the network in accordance with the network protocol and the protocol compatible with the network protocol when an identification number associated with the call request is not recognized at the second site such that the inter-site router can forward the call request to the first site using the first site identifier when the identification number associated with the call request matches one of the first plurality of identifiers. - View Dependent Claims (2, 3, 4, 5)
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6. A method for facilitating inter-site call routing in an enterprise having at least a first site and a second site connected through a network associated with the enterprise, the network operating according to a network protocol, the method comprising:
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registering a first plurality of identifiers and a first site identifier associated with the first site and a second plurality of identifiers and a second site identifier associated with the second site with a inter-site router operating in accordance with a protocol compatible with the network protocol; and
routing a call request received at one of the first site and the second site to the inter-site router over the network in accordance with the network protocol and the protocol compatible with the network protocol when an identification number associated with the call request does not match one of the first plurality of identifiers and the second plurality of identifiers associated with the one of the first site and the second site where the call request is received. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for facilitating call routing in an enterprise having a first site capable of connecting to a second site through a network associated with the enterprise, the network operating in accordance with a network protocol, the apparatus comprising:
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a first registrar having a first proxy coupled to the network and operating in accordance with a protocol compatible with the network protocol, the first registrar configured to register a plurality of identifiers and a first site identifier associated with the first site in a database associated with the first registrar; and
a Private Branch Exchange (PBX) coupled to the first registrar and the network, the PBX configured to route a call request received at the second site to the first registrar over the network in accordance with the network protocol and the protocol compatible with the network protocol when an identification number associated with the call request is not recognized at the second site, the first proxy configured to determine if the identification number is registered with the first registrar as one of the plurality of identifiers, the first proxy further configured to forward the call request to the first site using the first site identifier when the identification number associated with the call request matches one of the first plurality of identifiers. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification