diff --git a/.gitignore b/.gitignore
index bbb805f..066892d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,3 +36,4 @@ node_modules
 .DS_Store
 
 examples/*
+CLAUDE.md
\ No newline at end of file
diff --git a/lib/utils.js b/lib/utils.js
index fe1f3bf..e7ca31e 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -25,8 +25,8 @@ function makeRtpEngineOpts(req, srcIsUsingSrtp, dstIsUsingSrtp, teams = false) {
   const dstOpts = dstIsUsingSrtp ? srtpOpts : rtpCopy;
   const srcOpts = srcIsUsingSrtp ? srtpOpts : rtpCopy;
 
-  /* Allow Feature server to inject DTMF to both leg except call from Teams */
-  if (!teams) {
+  /* Allow rtpengine to inject DTMF for WebRTC clients only (this disables kernel forwarding) */
+  if (!teams && (isWSS(req) || process.env.JAMBONES_RTPENGINE_INJECT_DTMF_ALWAYS)) {
     dstOpts.flags.push('inject DTMF');
     srcOpts.flags.push('inject DTMF');
   }