diff --git a/lib/utils.js b/lib/utils.js
index 17886eb..a82a200 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -22,7 +22,7 @@ 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*/
+  /* Allow Feature server to inject DTMF to both leg except call from Teams */
   if (!teams) {
     dstOpts.flags.push('inject DTMF');
     srcOpts.flags.push('inject DTMF');
@@ -30,7 +30,8 @@ function makeRtpEngineOpts(req, srcIsUsingSrtp, dstIsUsingSrtp, teams = false) {
   const common = {
     'call-id': req.get('Call-ID'),
     'replace': ['origin', 'session-connection'],
-    'record call': process.env.JAMBONES_RECORD_ALL_CALLS ? 'yes' : 'no'
+    'record call': process.env.JAMBONES_RECORD_ALL_CALLS ? 'yes' : 'no',
+    ...(process.env.JAMBONES_ACCEPT_G729 && { codec: { mask: 'g729', transcode: 'pcmu'}})
   };
   return {
     common,