diff --git a/lib/tasks/sip_refer.js b/lib/tasks/sip_refer.js
index bac8e4c4..d9ca6fb4 100644
--- a/lib/tasks/sip_refer.js
+++ b/lib/tasks/sip_refer.js
@@ -122,8 +122,20 @@ class TaskSipRefer extends Task {
     }
     else this.referToIsUri = true;
     if (!referredBy) {
-      /* default */
-      referredBy = cs.req?.callingNumber || dlg.local.uri;
+      /* default: extract the sip: identity from PAI, preserving the original domain */
+      const paiHeader = cs.req?.has('p-asserted-identity') ? cs.req.get('p-asserted-identity') : null;
+      if (paiHeader) {
+        const parts = paiHeader.split(/,\s*(?=")/);
+        for (const part of parts) {
+          if (/<sips?:/.test(part)) {
+            referredBy = part.trim();
+            break;
+          }
+        }
+      }
+      if (!referredBy) {
+        referredBy = cs.req?.callingNumber || dlg.local.uri;
+      }
       this.logger.info({referredBy}, 'setting referredby');
     }
     if (!referredByDisplayName) {