diff --git a/server/src/common/validation/utils/frenchTelephoneNumber.ts b/server/src/common/validation/utils/frenchTelephoneNumber.ts
index 6ab3161d3..4701945c3 100644
--- a/server/src/common/validation/utils/frenchTelephoneNumber.ts
+++ b/server/src/common/validation/utils/frenchTelephoneNumber.ts
@@ -1,24 +1,5 @@
-export const telephoneConverter = (telephone: string | null) => {
-  if (!telephone) return telephone;
-  let phone = String(telephone)
+export const telephoneConverter = (telephone: string | null | undefined) =>
+  telephone
+    ?.toString()
     .trim()
-    .replaceAll("-", "")
-    .replaceAll(".", "")
-    .replaceAll(" ", "")
-    .replaceAll("(+)", "+");
-
-  if (phone.length === 9) {
-    return `+33${phone}`;
-  }
-
-  if (phone.length === 10 && phone[0] === "0") {
-    return `+33${phone.substr(1, 9)}`;
-  }
-
-  // Gestion des téléphones au format 033xxxxxxxxx
-  if (phone.length === 12 && phone[0] === "0") {
-    return `+33${phone.substr(3, 12)}`;
-  }
-
-  return phone;
-};
+    .replace(/[-.()\s]/g, "") ?? telephone;
diff --git a/server/src/common/validation/utils/zodPrimitives.ts b/server/src/common/validation/utils/zodPrimitives.ts
index ed66b89d4..b719d7193 100644
--- a/server/src/common/validation/utils/zodPrimitives.ts
+++ b/server/src/common/validation/utils/zodPrimitives.ts
@@ -11,6 +11,7 @@ import {
   UAI_REGEX,
   CODE_POSTAL_REGEX,
   DERNIER_ORGANISME_UAI_REGEX,
+  PHONE_REGEX_PATTERN,
 } from "shared";
 import { z } from "zod";
 
@@ -37,10 +38,16 @@ export const extensions = {
   phone: () =>
     z.coerce
       .string()
-      // On va vérifier que ça contient au moins un chiffre (ou que c'est une chaine vide, car on les accepte aussi)
-      .regex(/^$|.*[0-9].*/, "Format invalide")
-      // On passe à null en cas de chaine vide
       .transform((v: string) => (v ? telephoneConverter(v) : null))
+      .refine(
+        (v: string | null | undefined) => {
+          const phoneRegex = new RegExp(PHONE_REGEX_PATTERN, "g");
+          return v === null || v === undefined || phoneRegex.test(v);
+        },
+        {
+          message: "Format invalide",
+        }
+      )
       .openapi({
         example: "0628000000",
       }),
diff --git a/server/tests/integration/common/utils/validationUtils.test.ts b/server/tests/integration/common/utils/validationUtils.test.ts
index eada6403a..5bf034a25 100644
--- a/server/tests/integration/common/utils/validationUtils.test.ts
+++ b/server/tests/integration/common/utils/validationUtils.test.ts
@@ -41,17 +41,29 @@ describe("Validation Utils", () => {
   });
 
   describe("validation des numeros de telephone", () => {
-    [
+    const testCases = [
       { input: null, output: null },
       { input: undefined, output: undefined },
-      { input: 0, output: 0 },
+      { input: 0, output: "0" },
       { input: "", output: "" },
-      { input: "033638424988", output: "+33638424988" },
-      { input: "0638424988", output: "+33638424988" },
+      { input: "033638424988", output: "033638424988" },
+      { input: "0638424988", output: "0638424988" },
       { input: "(+)33638424988", output: "+33638424988" },
+      { input: "+33638424988", output: "+33638424988" },
+      { input: "+33123456789", output: "+33123456789" },
+      { input: "33 6 38 42 49 88", output: "33638424988" },
       { input: "12345678", output: "12345678" },
       { input: "ABCDEFGH", output: "ABCDEFGH" },
-    ].forEach(({ input, output }) => {
+      { input: "06-38.42.49.88", output: "0638424988" },
+      { input: "06.38.42.49.88", output: "0638424988" },
+      { input: "06-38-42-49-88", output: "0638424988" },
+      { input: "06 (38) 42 49 88", output: "0638424988" },
+      { input: "  06 38 42 49 88  ", output: "0638424988" },
+      { input: "06abc38424988", output: "06abc38424988" },
+      { input: "+33(6)384-249-88", output: "+33638424988" },
+    ];
+
+    testCases.forEach(({ input, output }) => {
       it(`Vérifie qu'un numero de téléphone ${JSON.stringify(input)} est transformé en ${output}`, () => {
         expect(telephoneConverter(input as any)).toStrictEqual(output);
       });
diff --git a/server/tests/integration/jobs/ingestion/process-ingestion.test.ts b/server/tests/integration/jobs/ingestion/process-ingestion.test.ts
index e30ebaef0..7757cf3b6 100644
--- a/server/tests/integration/jobs/ingestion/process-ingestion.test.ts
+++ b/server/tests/integration/jobs/ingestion/process-ingestion.test.ts
@@ -549,7 +549,7 @@ describe("Processus d'ingestion", () => {
             date_de_naissance: new Date("2000-10-28T00:00:00.000Z"),
             code_postal_de_naissance: "44000",
             courriel: "johndoe@example.org",
-            telephone: "+33123456789",
+            telephone: "0123456789",
             adresse: {
               code_postal: "75000",
               complete: "1 rue de la paix",
diff --git a/shared/constants/validations.ts b/shared/constants/validations.ts
index f0f81c1f0..5d44b8651 100644
--- a/shared/constants/validations.ts
+++ b/shared/constants/validations.ts
@@ -15,6 +15,8 @@ export const NIR_LOOSE_REGEX_PATTERN = "^[0-9]{13}([0-9]{2})?$";
 // Basé sur les recommandations SIFA
 export const DERNIER_ORGANISME_UAI_PATTERN =
   "^(0?[0-9][0-9]|0?2[AB]|0?9[012345]|97[1234678]|98[46789]|99[0135]|[0-9]{7}[a-zA-Z])$";
+export const PHONE_REGEX_PATTERN =
+  "(?:([+]\\d{1,4})[-.\\s]?)?(?:[(](\\d{1,3})[)][-.\\s]?)?(\\d{1,4})[-.\\s]?(\\d{1,4})[-.\\s]?(\\d{1,9})";
 
 // Numero INE (Identifiant National Elève)
 // Le numero INE composé de 11 caractères,