diff --git a/coreapi/linphonecall.c b/coreapi/linphonecall.c
index da2a461e0..41b39cb8b 100644
--- a/coreapi/linphonecall.c
+++ b/coreapi/linphonecall.c
@@ -223,7 +223,7 @@ static SalMediaDescription *_create_local_media_description(LinphoneCore *lc, Li
 	if (call->params.down_ptime)
 		md->streams[0].ptime=call->params.down_ptime;
 	else
-		md->streams[0].ptime=lc->net_conf.down_ptime;
+		md->streams[0].ptime=linphone_core_get_download_ptime(lc);
 	l=make_codec_list(lc,lc->codecs_conf.audio_codecs,call->params.audio_bw,&md->streams[0].max_rate);
 	pt=payload_type_clone(rtp_profile_get_payload_from_mime(&av_profile,"telephone-event"));
 	l=ms_list_append(l,pt);
diff --git a/coreapi/linphonecore.c b/coreapi/linphonecore.c
index e4f35e387..f8a33de57 100644
--- a/coreapi/linphonecore.c
+++ b/coreapi/linphonecore.c
@@ -967,14 +967,14 @@ int linphone_core_get_upload_bandwidth(const LinphoneCore *lc){
  * Set audio packetization time linphone expects to receive from peer
  */
 void linphone_core_set_download_ptime(LinphoneCore *lc, int ptime) {
-	lc->net_conf.down_ptime=ptime;
+	lp_config_set_int(lc->config,"rtp","download_ptime",ptime);
 }
 
 /**
  * Get audio packetization time linphone expects to receive from peer
  */
 int linphone_core_get_download_ptime(LinphoneCore *lc) {
-	return lc->net_conf.down_ptime;
+	return lp_config_get_int(lc->config,"rtp","download_ptime",0);
 }
 
 /**
diff --git a/coreapi/private.h b/coreapi/private.h
index 6affd1599..7fbc6d8cb 100644
--- a/coreapi/private.h
+++ b/coreapi/private.h
@@ -409,7 +409,6 @@ typedef struct net_config
 	int upload_bw;
 	int firewall_policy;
 	int mtu;
-	int down_ptime;
 	bool_t nat_sdp_only;
 }net_config_t;