diff --git a/apps/asterisk/configmap.yaml b/apps/asterisk/configmap.yaml
index 7d23828..1b85a78 100644
--- a/apps/asterisk/configmap.yaml
+++ b/apps/asterisk/configmap.yaml
@@ -96,7 +96,9 @@ data:
     allow=ulaw
     allow=alaw
     direct_media=no
-    dtmf_mode=inband
+    ; Yealink provisioning sends RFC2833/RFC4733 DTMF (payload 101).
+    ; Keep the PBX template aligned so physical desk phones emit ARI DTMF events.
+    dtmf_mode=rfc4733
     rtp_symmetric=yes
     force_rport=yes
     rewrite_contact=yes