diff --git a/lib/proto/conv.c b/lib/proto/conv.c
index bfebd61ba..bf7344a49 100644
--- a/lib/proto/conv.c
+++ b/lib/proto/conv.c
@@ -69,3 +69,20 @@ int ogs_paa_to_ip(const ogs_paa_t *paa, ogs_ip_t *ip)
     return OGS_OK;
 }
 
+int ogs_ip_to_paa(const ogs_ip_t *ip, ogs_paa_t *paa)
+{
+    if (ip->ipv4 && ip->ipv6) {
+        paa->session_type = OGS_PDU_SESSION_TYPE_IPV4V6;
+        paa->both.addr = ip->addr;
+        memcpy(paa->both.addr6, ip->addr6, OGS_IPV6_LEN);
+    } else if (ip->ipv6) {
+        paa->session_type = OGS_PDU_SESSION_TYPE_IPV6;
+        memcpy(paa->addr6, ip->addr6, OGS_IPV6_LEN);
+    } else if (ip->ipv4) {
+        paa->session_type = OGS_PDU_SESSION_TYPE_IPV4;
+        paa->addr = ip->addr;
+    } else {
+        return OGS_ERROR;
+    }
+    return OGS_OK;
+}
diff --git a/lib/proto/conv.h b/lib/proto/conv.h
index ec16beace..d3a89a1cb 100644
--- a/lib/proto/conv.h
+++ b/lib/proto/conv.h
@@ -31,6 +31,7 @@ extern "C" {
 void ogs_extract_digit_from_string(char *digit, char *string);
 
 int ogs_paa_to_ip(const ogs_paa_t *paa, ogs_ip_t *ip);
+int ogs_ip_to_paa(const ogs_ip_t *ip, ogs_paa_t *paa);
 
 #ifdef __cplusplus
 }