Contents 333The use case Scenario: Keep Logged Out State provides the requirementto prevent the logged out phone registered with the Call Server for ESAfrom reregistering.When this scenario occurs, the VOLO phone will sustain it’s AwaitingCallback state until the ESAVOLO timer expires, and returns to it’s originalLogged Out state, to give you the chance to go back to normal registrationby using the soft key provided.Configure ESA Data BlockConfigure the VOLO BLOCK only for the lowest customer number. If youconfigure a low customer number after you configure the VOLO BLOCK fora higher customer, the number is not handled. The VO set cannot registeras the configuration of the VOLO TN cannot occur in LD24 under such asituation. The VO set that tries to register in this case receives the promptService Not Available.Because you can define the ESA data block for any customer, you candefine the ESTN pool for any customer as well. The ESTN pool will onlybe required for customers that have access to the VO Login feature (lowestcustomer number for the time being).SysloadScenario: Load ESA VO Logout Settings• This scenario begins when the system starts loading the configurationdatabase from disk• The ESA VO Logout data configured in the Manage ESA Data andManage ESTN Data scenarios.Warm StartAn active call to or from PSAP survives a warm start. In Awaiting Callbackstate, the VOLO set will be able to register back to Call Server with thesame VOLO TN. But since it will loose it’s VOLO timer, and it is not possibleto distinguish between this situation and a first time registration, it is notpossible to reload the timer. To avoid this scenario, the Signalling Servermust deregister the phone and put it back to “Logged out” state.Emergency Services For Client MobilityThe Emergency Services Access feature is composes a CLID that identifiesthe physical location of the logged phone. If a system is configured withan internal LIS server, the location update might not happen right afterthe set registers.Nortel Communication Server 1000Branch Office Installation and CommissioningNN43001-314 01.02 StandardRelease 5.0 20 June 2007Copyright © 2007, Nortel Networks.
