So here's another curly problem I've come across today.
I have a situation where a client has a Genesys BCP setup with 2 sites running active / active mode.  Agents log in to one site predominantly but inbound calls are load balanced to both sites equally.
When a call arrives on site 2 and delivers to an agent on site 1 and that agent needs to transfer the call externally I need to perform some logic in IRD in order to specify a prefix on the outbound call, but only on these cross site calls.  With a normal inbound call I'm able to do this easily using user data, however with an intercommunication call I don't get all the original call data.
Anyone got any ideas on what I could use to identify the calls?
Here is a sample EventRouteRequest:
received from 65354(sipserver_a)host.domain:3000(fd=) message EventRouteRequest
        AttributeCallState      0
        AttributeCallType       4
        AttributeLocalCallType  4
        AttributeCallID 19748596
        AttributeConnID 076f02f79f7f7a05
        AttributeCallUUID       '01R3GJ2L9SF8196HICIH4PTAES02IG2R'
        AttributeTransferConnID 0771030cd0d02e4c
        AttributeUserData       [1788] 00 1c 00 00..
                'IW_CaseUid'    '1d625d70-f5e0-4e06-b914-8990d146a31b'
                'ContactId'     '0000XaGCGK319BTT'
                'DisplayContact'        ''
                'IWAttachedDataInformation'(list) 'ToastCaseDataBusinessAttribute'      'ViewAttachedData'
                                                  'CaseDataBusinessAttribute'   'ViewAttachedData'
                                                  'Option.interaction.case-data.frame-color'    '#FF17849D'
                                                  'Option.interaction.case-data.header-foreground-color'        '#FFFFFFFF'
                                                  'Option.expression.url'       '(?#Protocol)(?

?:ht|f)tp(?:s?)\:\/\/|~/|/)?(?#Username:Password)(?:\w+:\w+@)?(?#Subdomains)(?

?:[-\w]+\.)+(?#TopLevel Domains)(?:com|org|net|gov|mil|biz|info|mobi|name|aero|jobs|museum|travel|[a-z]{2}))(?#Port)(?::[\d]{1,5})?(?#Directories)(?

?

?:/(?:[-\w~!$+|.,=]|%[a-f\d]{2})+)+|/)+|\?|#)?(?#Query)(?

?:\?(?:[-\w~!$+|.,*:]|%[a-f\d{2}])+=(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)(?:&(?:[-\w~!$+|.,*:]|%[a-f\d{2}])+=(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)*)*(?#Anchor)(?:#(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)?'
                                                  'GCS_TransferringDate'        '7/8/2021 10:47:35 PM'
                                                  'GCS_TransferringAgentName'   'user@company'
                                                  'GCS_TransferringReason'      ''
                                                  'GCS_TransferringEmployeeId'  'user@company'
                                                  'GCS_TransferringNotepad'     ''
                'RVQDBID'       ''
                'RTargetAgSelDBID'      '19430'
                'RTargetPlSelDBID'      '12132'
                'RTenantDBID'   '169'
                'CustomerSegment'       'default'
                'ServiceType'   'default'
                'ServiceObjective'      ''
                'IWS_CallUuid'  '01R3GJ2L9SF8196HICIH4PTAES02IG2Q'
                'IWS_ConnID'    '0771030CD0D02E4C'
                'IWS_ANI'       '9876543210'
                'IWS_DNIS'      '169EXRP0053'
                'IWS_ThisDN'    '1699300'
                'NT_LOGIN'  'user'
                'BusinessResult'        '["none"]'
                'BusinessResultDisplay' 'none'
                'Outcome_1' 'none'
                'Outcome_2' 'none'
                'Outcome_3' 'none'
                'Outcome_4' 'none'
                'IW_RoutingBasedOriginalEmployeeId'     'user@company'
                'IW_RoutingBasedTargetType'     'TypeDestination'
                'IW_RoutingBasedTargetId'       '123456'
                'IW_RoutingBasedRequestType'    'InitTransfer'
                'IW_BundleUid'  '68136d13-693b-4bf1-b347-8205db674fa4'
        AttributeDNIS   '1699998'
        AttributeCustomerID     'Tenant'
        AttributeThisDN '1699998'
        AttributeThisDNRole     2
        AttributeThisQueue      '1699998'
        AttributePartyUUID      '00BI36ILA0F8196HICIH4PTAES2U0QM9'
        AttributeOtherDN        '1699300'
        AttributeOtherDNRole    1
        AttributeExtensions     [23] 00 01 01 00..
                'BusinessCall'  2
        AttributeTimeinSecs     1625748459 (22:47:39)
        AttributeTimeinuSecs    122138
        AttributeEventSequenceNumber    000000001b195983
As far as I can tell there is no meaningful difference between difference with these EventRouteRequests for cross site or same site calls.