a system and method that provides for graceful switchover of calls between call centers in response to a real or perceived emergency is described . in the following description specific details are set forth , such as device types , system configurations , communication methods , etc ., in order to provide a thorough understanding of the present invention . however , persons having ordinary skill in the arts will appreciate that these specific details may not be needed to practice the present invention . according to one embodiment of the present invention , a call center includes an acd system that responds to an emergency signal by automatically notifying all callers that the call center is currently experiencing an emergency and informing them that their call will be re - routed to another agent . the notification may be by way of an ivr script message either sent by the call center in the emergency state or dispatched from a central call center authority . the acd system then performs a bulk transfer to forward each of the active calls ( i . e ., those currently with an agent ; not in queue ) to another call center located in a different geographic region beyond the range of the emergency . an agent at the new call center then resumes communications with the caller . the present invention thus provides survivability of calls during an emergency without compromising customer satisfaction . fig1 is circuit schematic block diagram of an exemplary call center 10 in accordance with one embodiment of the present invention . call center 10 includes an acd 11 coupled with a plurality of agents 13 , a memory 15 , a supervisor workstation 14 , an optional video display unit ( vdu ) 12 , and an input / output ( i / o ) system 16 . acd 11 is configured to receive and service calls from a variety of sources across different communication media via i / o system 16 , which interfaces with network devices external to call center 10 . acd 11 may also receive a variety of different external signals , such as an emergency notification signal ( packet ) from an ip - based emergency response system ( ers ), via i / o system 16 . in one embodiment , i / o system 16 is also configured with circuitry for receiving wireless communication signals , which wireless signals may include an emergency notification signal . it is appreciated that the acd system shown in fig1 typically includes a processor subsystem comprising one or more processors coupled with various software modules that may be also implemented in firmware or some combination of hardware / software elements . commonly included is a historical reporting module that operates to build up the call history as it develops for use by the various agents during the call center session . the software modules may also optionally include code for generating a visual user interface for a caller communicating with the call center via a personal computer . fig2 is a diagram of an ip - based call center system 20 according to one embodiment of the present invention , wherein a plurality of geographically distributed call centers 21 - 24 are interconnected via an ip network 30 . for example , call centers 21 - 24 are shown being located in new york city , chicago , los angeles , and san francisco , respectively . the call center system of fig2 is typically configured in a hierarchical manner such that one of the call centers ( e . g ., call center 22 ) functions as a central authority that operates to dispatch incoming service calls to the various call centers . in the example of fig2 , incoming calls may be received across ip network 30 directly from a voice - over - ip ( voip ) phone 33 , or from traditional time - division multiplexing ( tdm ) device 34 connected to ip network 30 via a voip gateway 29 . incoming calls are usually placed in queue by the central dispatching authority before being routed to one of the call centers 21 - 24 . fig2 also illustrates an emergency response system 28 providing an emergency notification signal 27 to the acd associated with call center 24 across ip network 30 . signal 27 typically comprises a data packet sent to a call center in a particular geographic region in response to a real or perceived emergency affecting the local call center . ers 28 may or may not be located in the same geographic location as call center 24 . in this example , ers 28 may be alerted to an emergency condition ( e . g ., fire , earthquake , etc .) impacting the call center location in a variety of ways . national weather service reports , news alerts , and third party telephone calls are just some of the ways that ers 28 may become aware of a real or perceived emergency . regardless of the manner that it is alerted to an emergency , ers 28 responds by issuing a signal 27 to affected call center 24 . call center 24 , in turn , responds to signal 27 by placing the entire call center in an emergency state , as illustrated in the flock diagram of fig3 ( discussed in more detail below ). it should be understood that ers 28 may be integrated as part of the same enterprise or business entity providing call service through call centers 21 - 24 , or , alternatively , ers 28 may be a separate , third party servicing entity . in addition , emergency notification signal 27 need not be provided via ip network 30 ; rather , signal 27 may comprise a variety of different communication signal types ( e . g ., pstn ) that the call center is capable of receiving . another alternative is to provide an emergency notification signal via a wireless network from a wireless alarm unit 25 that transmits directly to the acd of call center 24 . for instance , such an emergency alarm box unit may be provided outside of the call center building . the alarm may be triggered by an employee of the call center before or after evacuation of the building due an emergency . like signal 27 , the wireless alarm signal provided by unit 25 immediately places call center 24 in an emergency state . fig3 is a flowchart diagram that illustrates a method of operation according to one embodiment of the present invention . the process begins with the occurrence of the event giving rise to the real or perceived emergency ( block 41 ). upon learning of the emergency event , ers 28 sends an emergency notification signal ( i . e ., signal 27 ) to the call center . this is shown happening at block 42 . in certain cases , more than one call center may be affected by the emergency , resulting in the issuance of multiple emergency notification signals . the acd responds to the emergency notification signal by placing the entire call center in an emergency state ( block 43 ), which , in one embodiment , initiates the following sequence of events . first , an ivr system associated with the acd of the affected call center immediately plays out an voice script notifying all active callers ( i . e ., those currently communicating with agents ) that the call center is now in an emergency state , and that their call will be automatically re - routed to another agent in a different call center ( block 44 ). alternatively , the ivr may be played out by the central dispatching authority responsible for re - routing of the calls . in this latter embodiment , the central authority may be notified of the emergency state by a message sent from the call center experiencing the emergency condition , or directly from the ers . after all of the active callers have been notified of the emergency state , a bulk transfer of each of the active callers to another call center occurs ( block 45 ). the bulk transfer of active calls may be accomplished in several ways . one way is for the affected call center to perform the transfer of each of the active calls itself . basically , this involves the acd of the call center executing code that results in forwarding of each call to another call center , or to a central call dispatching authority which then handles the transfer to another call center . it is appreciated that all of the callers may not necessarily be transferred to the same call center . that is , each of the callers could be transferred to different call centers . as stated previously , another alternative is to have the affected call center send a message to the central call center authority , which can then perform the bulk transfer of all calls to other call centers . this latter embodiment might result in potentially fewer lost calls due to the fact that the impending disaster associated with the emergency may result in total loss of all connections to the call center before call forwarding can be completed . regardless of the manner that the bulk transfer is accomplished , the call center will remain in the emergency ( shut - down ) state until the emergency passes and the center is reset to once again receive calls . it should be understood that elements of the present invention may also be provided as a computer program product which may include a machine - readable medium having stored thereon instructions which may be used to program a computer ( e . g ., a processor or other electronic device ) to perform a sequence of operations . alternatively , the operations may be performed by a combination of hardware and software . the machine - readable medium may include , but is not limited to , floppy diskettes , optical disks , cd - roms , and magneto - optical disks , roms , rams , eproms , eeproms , magnet or optical cards , propagation media or other type of media / machine - readable medium suitable for storing electronic instructions . for example , elements of the present invention may be downloaded as a computer program product , wherein the program may be transferred from a remote computer or telephonic device to a requesting process by way of data signals embodied in a carrier wave or other propagation medium via a communication link ( e . g ., a modem or network connection ). additionally , although the present invention has been described in conjunction with specific embodiments , numerous modifications and alterations are well within the scope of the present invention . accordingly , the specification and drawings are to be regarded in an illustrative rather than a restrictive sense .