diff --git a/packages/fax/src/models/v3/errors/call-error/call-error.ts b/packages/fax/src/models/v3/errors/call-error/call-error.ts
index 286f34c..716ac21 100644
--- a/packages/fax/src/models/v3/errors/call-error/call-error.ts
+++ b/packages/fax/src/models/v3/errors/call-error/call-error.ts
@@ -10,4 +10,4 @@ export interface CallError {
   errorCode?: CallErrorCodeEnum;
 }
 
-export type CallErrorCodeEnum = '11' | '15' | '16' | '17' | '19' | '30' | '32' | '34' | '43' | '49';
+export type CallErrorCodeEnum = '11' | '15' | '16' | '17' | '19' | '30' | '32' | '34' | '43' | '49' | string;
diff --git a/packages/fax/src/models/v3/errors/document-conversion-error/document-conversion-error.ts b/packages/fax/src/models/v3/errors/document-conversion-error/document-conversion-error.ts
index 16227c3..e01eaa5 100644
--- a/packages/fax/src/models/v3/errors/document-conversion-error/document-conversion-error.ts
+++ b/packages/fax/src/models/v3/errors/document-conversion-error/document-conversion-error.ts
@@ -10,4 +10,5 @@ export interface DocumentConversionError {
   errorCode?: DocumentConversionErrorCodeEnum;
 }
 
-export type DocumentConversionErrorCodeEnum = '4' | '54' | '55' | '57' | '69' | '122' | '128' | '129' | '130' | '133';
+export type DocumentConversionErrorCodeEnum = '4' | '54' | '55' | '57' | '69' | '122'
+  | '128' | '129' | '130' | '133 | string';
diff --git a/packages/fax/src/models/v3/errors/fax-error/fax-error.ts b/packages/fax/src/models/v3/errors/fax-error/fax-error.ts
index b97af01..39366ea 100644
--- a/packages/fax/src/models/v3/errors/fax-error/fax-error.ts
+++ b/packages/fax/src/models/v3/errors/fax-error/fax-error.ts
@@ -13,4 +13,4 @@ export interface FaxError {
 export type FaxErrorCodeEnum = '6' | '7' | '8' | '10' | '12' | '13' | '14' | '18'
   | '20' | '21' | '22' | '25' | '26' | '28' | '29' | '31' | '38' | '40' | '41'
   | '44' | '46' | '48' | '53' | '60' | '63' | '68' | '75' | '76' | '77' | '79'
-  | '80' | '82' | '84' | '113' | '117' | '119' | '131' | '132';
+  | '80' | '82' | '84' | '113' | '117' | '119' | '131' | '132' | string;