diff --git a/CHANGELOG.md b/CHANGELOG.md
index 20365aa36..2cb464394 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@
 - Heartbeat: tighten prompt guidance + suppress duplicate alerts for 24h. (#980) — thanks @voidserf.
 - Repo: ignore local identity files to avoid accidental commits. (#1001) — thanks @gerardward2007.
 - Sessions/Security: add `session.dmScope` for multi-user DM isolation and audit warnings. (#948) — thanks @Alphonse-arianee.
+- Sessions: add `session.identityLinks` for cross-platform DM session linking. (#1033) — thanks @thewilloftheshadow.
 - Plugins: add provider auth registry + `clawdbot models auth login` for plugin-driven OAuth/API key flows.
 - Skills: add user-invocable skill commands (sanitized + unique), native skill registration gating, and an opt-out for model invocation.
 - Onboarding: switch channels setup to a single-select loop with per-channel actions and disabled hints in the picker.
diff --git a/docs/concepts/session.md b/docs/concepts/session.md
index 005edf7be..075f4b039 100644
--- a/docs/concepts/session.md
+++ b/docs/concepts/session.md
@@ -11,6 +11,7 @@ Use `session.dmScope` to control how **direct messages** are grouped:
 - `main` (default): all DMs share the main session for continuity.
 - `per-peer`: isolate by sender id across channels.
 - `per-channel-peer`: isolate by channel + sender (recommended for multi-user inboxes).
+Use `session.identityLinks` to map provider-prefixed peer ids to a canonical identity so the same person shares a DM session across channels when using `per-peer` or `per-channel-peer`.
 
 ## Gateway is the source of truth
 All session state is **owned by the gateway** (the “master” Clawdbot). UI clients (macOS app, WebChat, etc.) must query the gateway for session lists and token counts instead of reading local files.
@@ -42,6 +43,7 @@ the workspace is writable. See [Memory](/concepts/memory) and
     - Multiple phone numbers and channels can map to the same agent main key; they act as transports into one conversation.
   - `per-peer`: `agent:<agentId>:dm:<peerId>`.
   - `per-channel-peer`: `agent:<agentId>:<channel>:dm:<peerId>`.
+  - If `session.identityLinks` matches a provider-prefixed peer id (for example `telegram:123`), the canonical key replaces `<peerId>` so the same person shares a session across channels.
 - Group chats isolate state: `agent:<agentId>:<channel>:group:<id>` (rooms/channels use `agent:<agentId>:<channel>:channel:<id>`).
   - Telegram forum topics append `:topic:<threadId>` to the group id for isolation.
   - Legacy `group:<id>` keys are still recognized for migration.
@@ -86,6 +88,9 @@ Send these as standalone messages so they register.
   session: {
     scope: "per-sender",      // keep group keys separate
     dmScope: "main",          // DM continuity (set per-channel-peer for shared inboxes)
+    identityLinks: {
+      alice: ["telegram:123456789", "discord:987654321012345678"]
+    },
     idleMinutes: 120,
     resetTriggers: ["/new", "/reset"],
     store: "~/.clawdbot/agents/{agentId}/sessions/sessions.json",
diff --git a/docs/gateway/configuration.md b/docs/gateway/configuration.md
index 49afda5a4..e6e30a597 100644
--- a/docs/gateway/configuration.md
+++ b/docs/gateway/configuration.md
@@ -2269,6 +2269,9 @@ Controls session scoping, idle expiry, reset triggers, and where the session sto
   session: {
     scope: "per-sender",
     dmScope: "main",
+    identityLinks: {
+      alice: ["telegram:123456789", "discord:987654321012345678"]
+    },
     idleMinutes: 60,
     resetTriggers: ["/new", "/reset"],
     // Default is already per-agent under ~/.clawdbot/agents/<agentId>/sessions/sessions.json
@@ -2297,6 +2300,8 @@ Fields:
   - `main`: all DMs share the main session for continuity.
   - `per-peer`: isolate DMs by sender id across channels.
   - `per-channel-peer`: isolate DMs per channel + sender (recommended for multi-user inboxes).
+- `identityLinks`: map canonical ids to provider-prefixed peers so the same person shares a DM session across channels when using `per-peer` or `per-channel-peer`.
+  - Example: `alice: ["telegram:123456789", "discord:987654321012345678"]`.
 - `agentToAgent.maxPingPongTurns`: max reply-back turns between requester/target (0–5, default 5).
 - `sendPolicy.default`: `allow` or `deny` fallback when no rule matches.
 - `sendPolicy.rules[]`: match by `channel`, `chatType` (`direct|group|room`), or `keyPrefix` (e.g. `cron:`). First deny wins; otherwise allow.
diff --git a/docs/gateway/security.md b/docs/gateway/security.md
index 3106ca8ba..f830bb098 100644
--- a/docs/gateway/security.md
+++ b/docs/gateway/security.md
@@ -133,7 +133,7 @@ By default, Clawdbot routes **all DMs into the main session** so your assistant
 }
 ```
 
-This prevents cross-user context leakage while keeping group chats isolated. See [Session Management](/concepts/session) and [Configuration](/gateway/configuration).
+This prevents cross-user context leakage while keeping group chats isolated. If the same person contacts you on multiple channels, use `session.identityLinks` to collapse those DM sessions into one canonical identity. See [Session Management](/concepts/session) and [Configuration](/gateway/configuration).
 
 ## Allowlists (DM + groups) — terminology
 
diff --git a/src/config/schema.ts b/src/config/schema.ts
index 475d02130..25bd2c4d1 100644
--- a/src/config/schema.ts
+++ b/src/config/schema.ts
@@ -337,6 +337,8 @@ const FIELD_HELP: Record<string, string> = {
   "commands.useAccessGroups": "Enforce access-group allowlists/policies for commands.",
   "session.dmScope":
     'DM session scoping: "main" keeps continuity; "per-peer" or "per-channel-peer" isolates DM history (recommended for shared inboxes).',
+  "session.identityLinks":
+    "Map canonical identities to provider-prefixed peer IDs for DM session linking (example: telegram:123456).",
   "channels.telegram.configWrites":
     "Allow Telegram to write config in response to channel events/commands (default: true).",
   "channels.slack.configWrites":
diff --git a/src/config/types.base.ts b/src/config/types.base.ts
index 64a503926..3c33f16aa 100644
--- a/src/config/types.base.ts
+++ b/src/config/types.base.ts
@@ -57,6 +57,8 @@ export type SessionConfig = {
   scope?: SessionScope;
   /** DM session scoping (default: "main"). */
   dmScope?: DmScope;
+  /** Map platform-prefixed identities (e.g. "telegram:123") to canonical DM peers. */
+  identityLinks?: Record<string, string[]>;
   resetTriggers?: string[];
   idleMinutes?: number;
   heartbeatIdleMinutes?: number;
diff --git a/src/config/zod-schema.session.ts b/src/config/zod-schema.session.ts
index 8f5f6573b..df6239e05 100644
--- a/src/config/zod-schema.session.ts
+++ b/src/config/zod-schema.session.ts
@@ -13,6 +13,7 @@ export const SessionSchema = z
     dmScope: z
       .union([z.literal("main"), z.literal("per-peer"), z.literal("per-channel-peer")])
       .optional(),
+    identityLinks: z.record(z.string(), z.array(z.string())).optional(),
     resetTriggers: z.array(z.string()).optional(),
     idleMinutes: z.number().int().positive().optional(),
     heartbeatIdleMinutes: z.number().int().positive().optional(),
diff --git a/src/routing/resolve-route.test.ts b/src/routing/resolve-route.test.ts
index a526ee234..ec4a9cc9a 100644
--- a/src/routing/resolve-route.test.ts
+++ b/src/routing/resolve-route.test.ts
@@ -44,6 +44,42 @@ describe("resolveAgentRoute", () => {
     expect(route.sessionKey).toBe("agent:main:whatsapp:dm:+15551234567");
   });
 
+  test("identityLinks collapses per-peer DM sessions across providers", () => {
+    const cfg: ClawdbotConfig = {
+      session: {
+        dmScope: "per-peer",
+        identityLinks: {
+          alice: ["telegram:111111111", "discord:222222222222222222"],
+        },
+      },
+    };
+    const route = resolveAgentRoute({
+      cfg,
+      channel: "telegram",
+      accountId: null,
+      peer: { kind: "dm", id: "111111111" },
+    });
+    expect(route.sessionKey).toBe("agent:main:dm:alice");
+  });
+
+  test("identityLinks applies to per-channel-peer DM sessions", () => {
+    const cfg: ClawdbotConfig = {
+      session: {
+        dmScope: "per-channel-peer",
+        identityLinks: {
+          alice: ["telegram:111111111", "discord:222222222222222222"],
+        },
+      },
+    };
+    const route = resolveAgentRoute({
+      cfg,
+      channel: "discord",
+      accountId: null,
+      peer: { kind: "dm", id: "222222222222222222" },
+    });
+    expect(route.sessionKey).toBe("agent:main:discord:dm:alice");
+  });
+
   test("peer binding wins over account binding", () => {
     const cfg: ClawdbotConfig = {
       bindings: [
diff --git a/src/routing/resolve-route.ts b/src/routing/resolve-route.ts
index 318c9ee0c..15d51923b 100644
--- a/src/routing/resolve-route.ts
+++ b/src/routing/resolve-route.ts
@@ -70,6 +70,7 @@ export function buildAgentSessionKey(params: {
   peer?: RoutePeer | null;
   /** DM session scope. */
   dmScope?: "main" | "per-peer" | "per-channel-peer";
+  identityLinks?: Record<string, string[]>;
 }): string {
   const channel = normalizeToken(params.channel) || "unknown";
   const peer = params.peer;
@@ -80,6 +81,7 @@ export function buildAgentSessionKey(params: {
     peerKind: peer?.kind ?? "dm",
     peerId: peer ? normalizeId(peer.id) || "unknown" : null,
     dmScope: params.dmScope,
+    identityLinks: params.identityLinks,
   });
 }
 
@@ -153,6 +155,7 @@ export function resolveAgentRoute(input: ResolveAgentRouteInput): ResolvedAgentR
   });
 
   const dmScope = input.cfg.session?.dmScope ?? "main";
+  const identityLinks = input.cfg.session?.identityLinks;
 
   const choose = (agentId: string, matchedBy: ResolvedAgentRoute["matchedBy"]) => {
     const resolvedAgentId = pickFirstExistingAgentId(input.cfg, agentId);
@@ -165,6 +168,7 @@ export function resolveAgentRoute(input: ResolveAgentRouteInput): ResolvedAgentR
         channel,
         peer,
         dmScope,
+        identityLinks,
       }),
       mainSessionKey: buildAgentMainSessionKey({
         agentId: resolvedAgentId,
diff --git a/src/routing/session-key.ts b/src/routing/session-key.ts
index 5bb10fbb8..1821b7ad5 100644
--- a/src/routing/session-key.ts
+++ b/src/routing/session-key.ts
@@ -88,13 +88,23 @@ export function buildAgentPeerSessionKey(params: {
   channel: string;
   peerKind?: "dm" | "group" | "channel" | null;
   peerId?: string | null;
+  identityLinks?: Record<string, string[]>;
   /** DM session scope. */
   dmScope?: "main" | "per-peer" | "per-channel-peer";
 }): string {
   const peerKind = params.peerKind ?? "dm";
   if (peerKind === "dm") {
     const dmScope = params.dmScope ?? "main";
-    const peerId = (params.peerId ?? "").trim();
+    let peerId = (params.peerId ?? "").trim();
+    const linkedPeerId =
+      dmScope === "main"
+        ? null
+        : resolveLinkedPeerId({
+            identityLinks: params.identityLinks,
+            channel: params.channel,
+            peerId,
+          });
+    if (linkedPeerId) peerId = linkedPeerId;
     if (dmScope === "per-channel-peer" && peerId) {
       const channel = (params.channel ?? "").trim().toLowerCase() || "unknown";
       return `agent:${normalizeAgentId(params.agentId)}:${channel}:dm:${peerId}`;
@@ -112,6 +122,38 @@ export function buildAgentPeerSessionKey(params: {
   return `agent:${normalizeAgentId(params.agentId)}:${channel}:${peerKind}:${peerId}`;
 }
 
+function resolveLinkedPeerId(params: {
+  identityLinks?: Record<string, string[]>;
+  channel: string;
+  peerId: string;
+}): string | null {
+  const identityLinks = params.identityLinks;
+  if (!identityLinks) return null;
+  const peerId = params.peerId.trim();
+  if (!peerId) return null;
+  const candidates = new Set<string>();
+  const rawCandidate = normalizeToken(peerId);
+  if (rawCandidate) candidates.add(rawCandidate);
+  const channel = normalizeToken(params.channel);
+  if (channel) {
+    const scopedCandidate = normalizeToken(`${channel}:${peerId}`);
+    if (scopedCandidate) candidates.add(scopedCandidate);
+  }
+  if (candidates.size === 0) return null;
+  for (const [canonical, ids] of Object.entries(identityLinks)) {
+    const canonicalName = canonical.trim();
+    if (!canonicalName) continue;
+    if (!Array.isArray(ids)) continue;
+    for (const id of ids) {
+      const normalized = normalizeToken(id);
+      if (normalized && candidates.has(normalized)) {
+        return canonicalName;
+      }
+    }
+  }
+  return null;
+}
+
 export function buildGroupHistoryKey(params: {
   channel: string;
   accountId?: string | null;