diff --git a/include/linux/netfilter/nf_conntrack_sip.h b/include/linux/netfilter/nf_conntrack_sip.h
index 5da04e5..23aa2ec 100644
--- a/include/linux/netfilter/nf_conntrack_sip.h
+++ b/include/linux/netfilter/nf_conntrack_sip.h
@@ -7,6 +7,7 @@
 
 struct nf_ct_sip_master {
 	unsigned int	register_cseq;
+	unsigned int	invite_cseq;
 };
 
 enum sip_expectation_classes {
diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index 9f49000..2f9bbc0 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -870,6 +870,7 @@
 {
 	enum ip_conntrack_info ctinfo;
 	struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
+	struct nf_conn_help *help = nfct_help(ct);
 	unsigned int matchoff, matchlen;
 	unsigned int mediaoff, medialen;
 	unsigned int sdpoff;
@@ -959,6 +960,9 @@
 	if (nf_nat_sdp_session && ct->status & IPS_NAT_MASK)
 		ret = nf_nat_sdp_session(skb, dptr, sdpoff, datalen, &rtp_addr);
 
+	if (ret == NF_ACCEPT && i > 0)
+		help->help.ct_sip_info.invite_cseq = cseq;
+
 	return ret;
 }
 static int process_invite_response(struct sk_buff *skb,
@@ -967,14 +971,14 @@
 {
 	enum ip_conntrack_info ctinfo;
 	struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
+	struct nf_conn_help *help = nfct_help(ct);
 
 	if ((code >= 100 && code <= 199) ||
 	    (code >= 200 && code <= 299))
 		return process_sdp(skb, dptr, datalen, cseq);
-	else {
+	else if (help->help.ct_sip_info.invite_cseq == cseq)
 		flush_expectations(ct, true);
-		return NF_ACCEPT;
-	}
+	return NF_ACCEPT;
 }
 
 static int process_update_response(struct sk_buff *skb,
@@ -983,14 +987,14 @@
 {
 	enum ip_conntrack_info ctinfo;
 	struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
+	struct nf_conn_help *help = nfct_help(ct);
 
 	if ((code >= 100 && code <= 199) ||
 	    (code >= 200 && code <= 299))
 		return process_sdp(skb, dptr, datalen, cseq);
-	else {
+	else if (help->help.ct_sip_info.invite_cseq == cseq)
 		flush_expectations(ct, true);
-		return NF_ACCEPT;
-	}
+	return NF_ACCEPT;
 }
 
 static int process_prack_response(struct sk_buff *skb,
@@ -999,14 +1003,14 @@
 {
 	enum ip_conntrack_info ctinfo;
 	struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
+	struct nf_conn_help *help = nfct_help(ct);
 
 	if ((code >= 100 && code <= 199) ||
 	    (code >= 200 && code <= 299))
 		return process_sdp(skb, dptr, datalen, cseq);
-	else {
+	else if (help->help.ct_sip_info.invite_cseq == cseq)
 		flush_expectations(ct, true);
-		return NF_ACCEPT;
-	}
+	return NF_ACCEPT;
 }
 
 static int process_bye_request(struct sk_buff *skb,