diff --git a/api/routes/organization.py b/api/routes/organization.py
index 3728ddb5..a35eb292 100644
--- a/api/routes/organization.py
+++ b/api/routes/organization.py
@@ -536,18 +536,6 @@ async def get_model_configuration_preferences_legacy(
     return await get_preferences(user=user)
 
 
-@router.put(
-    "/model-configurations/preferences",
-    response_model=OrganizationPreferences,
-    include_in_schema=False,
-)
-async def save_model_configuration_preferences_legacy(
-    request: OrganizationPreferences,
-    user: UserModel = Depends(get_user_with_selected_organization),
-):
-    return await save_preferences(request=request, user=user)
-
-
 def preserve_masked_fields(provider: str, request_dict: dict, existing: dict):
     """If the client re-submitted a masked sensitive field, restore the original."""
     for field_name in _sensitive_fields(provider):
diff --git a/api/services/workflow/tools/transfer_resolver.py b/api/services/workflow/tools/transfer_resolver.py
index d76f2cdf..ce354f5a 100644
--- a/api/services/workflow/tools/transfer_resolver.py
+++ b/api/services/workflow/tools/transfer_resolver.py
@@ -356,7 +356,7 @@ async def resolve_transfer_config(
         logger.info(
             "Transfer destination resolved from context mapping "
             f"context_path={resolved.metadata.get('context_path')} "
-            f"resolved={resolved}"
+            f"source={resolved.source} destination={resolved.destination}"
         )
         return resolved
 
diff --git a/ui/src/app/workflow/[workflowId]/settings/page.tsx b/ui/src/app/workflow/[workflowId]/settings/page.tsx
index 65a33c56..bfc1fc2e 100644
--- a/ui/src/app/workflow/[workflowId]/settings/page.tsx
+++ b/ui/src/app/workflow/[workflowId]/settings/page.tsx
@@ -1,7 +1,7 @@
 "use client";
 
 import { format } from "date-fns";
-import { ArrowLeft, BookA, Brain, CalendarIcon, Clipboard, Download, ExternalLink, FileDown, Fingerprint, Loader2, Mic, Pause, PhoneOff, Play, Rocket, Settings, Trash2Icon, Upload, Variable, X } from "lucide-react";
+import { ArrowLeft, BookA, Brain, CalendarIcon, Clipboard, Download, ExternalLink, FileDown, Fingerprint, Loader2, Mic, Pause, PhoneOff, Play, Plus, Rocket, Settings, Trash2Icon, Upload, Variable, X } from "lucide-react";
 import Link from "next/link";
 import { useParams, useRouter } from "next/navigation";
 import { useEffect, useMemo, useRef, useState } from "react";
@@ -38,6 +38,7 @@ import { Separator } from "@/components/ui/separator";
 import { Switch } from "@/components/ui/switch";
 import { Textarea } from "@/components/ui/textarea";
 import { SETTINGS_DOCUMENTATION_URLS } from "@/constants/documentation";
+import { useOrgConfig } from "@/context/OrgConfigContext";
 import { UnsavedChangesProvider, useUnsavedChanges, useUnsavedChangesContext } from "@/context/UnsavedChangesContext";
 import { useAudioPlayback } from "@/hooks/useAudioPlayback";
 import { detailFromError } from "@/lib/apiError";
@@ -49,6 +50,7 @@ import {
     DEFAULT_PROVISIONAL_VAD_PAUSE_SECS,
     DEFAULT_TURN_START_MIN_WORDS,
     DEFAULT_VOICEMAIL_DETECTION_CONFIGURATION,
+    type ExternalPBXFieldMapping,
     resolveWorkflowConfigurations,
     TURN_START_STRATEGY_OPTIONS,
     type TurnStartStrategy,
@@ -273,6 +275,7 @@ function GeneralSection({
     workflowId: number;
     onSave: (configurations: WorkflowConfigurations, workflowName: string) => Promise<void>;
 }) {
+    const { externalPbxIntegrationsEnabled } = useOrgConfig();
     const [name, setName] = useState(workflowName);
     const [ambientNoiseConfig, setAmbientNoiseConfig] = useState<AmbientNoiseConfiguration>(
         workflowConfigurations.ambient_noise_configuration,
@@ -298,6 +301,9 @@ function GeneralSection({
     const [includeTranscriptEndTimestamps, setIncludeTranscriptEndTimestamps] = useState(
         workflowConfigurations.transcript_configuration?.include_end_timestamps ?? false,
     );
+    const [externalPbxFieldMappings, setExternalPbxFieldMappings] = useState<ExternalPBXFieldMapping[]>(
+        workflowConfigurations.external_pbx_field_mappings,
+    );
     const [isSaving, setIsSaving] = useState(false);
     const [isUploadingAudio, setIsUploadingAudio] = useState(false);
     const [audioUploadError, setAudioUploadError] = useState<string | null>(null);
@@ -306,6 +312,11 @@ function GeneralSection({
     const selectedTurnStartStrategy = TURN_START_STRATEGY_OPTIONS.find(
         (option) => option.value === turnStartStrategy,
     );
+    const externalPbxFieldMappingsValid = externalPbxFieldMappings.every(
+        (mapping) =>
+            Boolean(mapping.context_path.trim()) &&
+            /^[A-Za-z][A-Za-z0-9_]{0,63}$/.test(mapping.destination_field.trim()),
+    );
 
     const isDirty = useMemo(() => {
         const initAmbient = workflowConfigurations.ambient_noise_configuration;
@@ -321,9 +332,11 @@ function GeneralSection({
             turnStopStrategy !== workflowConfigurations.turn_stop_strategy ||
             contextCompactionEnabled !== workflowConfigurations.context_compaction_enabled ||
             includeTranscriptEndTimestamps !==
-            (workflowConfigurations.transcript_configuration?.include_end_timestamps ?? false)
+            (workflowConfigurations.transcript_configuration?.include_end_timestamps ?? false) ||
+            JSON.stringify(externalPbxFieldMappings) !==
+            JSON.stringify(workflowConfigurations.external_pbx_field_mappings)
         );
-    }, [name, workflowName, ambientNoiseConfig, maxCallDuration, maxUserIdleTimeout, smartTurnStopSecs, turnStartStrategy, turnStartMinWords, provisionalVadPauseSecs, turnStopStrategy, contextCompactionEnabled, includeTranscriptEndTimestamps, workflowConfigurations]);
+    }, [name, workflowName, ambientNoiseConfig, maxCallDuration, maxUserIdleTimeout, smartTurnStopSecs, turnStartStrategy, turnStartMinWords, provisionalVadPauseSecs, turnStopStrategy, contextCompactionEnabled, includeTranscriptEndTimestamps, externalPbxFieldMappings, workflowConfigurations]);
 
     useUnsavedChanges("general", isDirty);
 
@@ -404,6 +417,7 @@ function GeneralSection({
                         ...(workflowConfigurations.transcript_configuration ?? {}),
                         include_end_timestamps: includeTranscriptEndTimestamps,
                     },
+                    external_pbx_field_mappings: externalPbxFieldMappings,
                 },
                 name,
             );
@@ -788,10 +802,94 @@ function GeneralSection({
                         </div>
                     </div>
                 </div>
+
+                {externalPbxIntegrationsEnabled && (
+                    <>
+                        <Separator />
+
+                        {/* External PBX Field Updates */}
+                        <div className="space-y-4">
+                            <div>
+                                <h3 className="text-sm font-medium">External PBX Field Updates</h3>
+                                <p className="text-xs text-muted-foreground mt-0.5">
+                                    Optionally copy final gathered-context values into provider-native fields before transfer or hangup.
+                                </p>
+                            </div>
+                            <div className="flex items-center justify-between">
+                                <Label className="text-sm">Field Mappings</Label>
+                                <Button
+                                    type="button"
+                                    variant="outline"
+                                    size="sm"
+                                    onClick={() => setExternalPbxFieldMappings((current) => [
+                                        ...current,
+                                        { context_path: "", destination_field: "" },
+                                    ])}
+                                >
+                                    <Plus className="mr-1 h-4 w-4" /> Add mapping
+                                </Button>
+                            </div>
+                            <div className="space-y-2">
+                                {externalPbxFieldMappings.map((mapping, index) => (
+                                    <div key={index} className="grid grid-cols-[1fr_1fr_auto] gap-2">
+                                        <Input
+                                            aria-label={`Gathered context field ${index + 1}`}
+                                            value={mapping.context_path}
+                                            onChange={(event) => setExternalPbxFieldMappings((current) =>
+                                                current.map((item, itemIndex) =>
+                                                    itemIndex === index
+                                                        ? { ...item, context_path: event.target.value }
+                                                        : item,
+                                                )
+                                            )}
+                                            placeholder="qualified"
+                                        />
+                                        <Input
+                                            aria-label={`External PBX destination field ${index + 1}`}
+                                            value={mapping.destination_field}
+                                            onChange={(event) => setExternalPbxFieldMappings((current) =>
+                                                current.map((item, itemIndex) =>
+                                                    itemIndex === index
+                                                        ? { ...item, destination_field: event.target.value }
+                                                        : item,
+                                                )
+                                            )}
+                                            placeholder="address3"
+                                        />
+                                        <Button
+                                            type="button"
+                                            variant="ghost"
+                                            size="icon"
+                                            aria-label={`Remove external PBX field mapping ${index + 1}`}
+                                            onClick={() => setExternalPbxFieldMappings((current) =>
+                                                current.filter((_, itemIndex) => itemIndex !== index)
+                                            )}
+                                        >
+                                            <Trash2Icon className="h-4 w-4" />
+                                        </Button>
+                                    </div>
+                                ))}
+                                {externalPbxFieldMappings.length === 0 && (
+                                    <p className="text-xs text-muted-foreground">
+                                        No external fields will be updated. Context names may be direct extracted-variable names or paths such as extracted_variables.qualified.
+                                    </p>
+                                )}
+                                {!externalPbxFieldMappingsValid && (
+                                    <p className="text-xs text-destructive">
+                                        Each mapping needs a context field and a destination field containing only letters, numbers, and underscores.
+                                    </p>
+                                )}
+                            </div>
+                        </div>
+                    </>
+                )}
             </CardContent>
             <CardFooter className="justify-end gap-3 border-t pt-6">
                 {isDirty && <span className="text-xs text-muted-foreground">Unsaved changes</span>}
-                <Button onClick={handleSave} disabled={isSaving || !isDirty}>
+                <Button
+                    onClick={handleSave}
+                    disabled={isSaving || !isDirty || (externalPbxIntegrationsEnabled && !externalPbxFieldMappingsValid)}
+                >
                     {isSaving ? "Saving..." : "Save General Settings"}
                 </Button>
             </CardFooter>