diff --git a/daemon/call_interfaces.c b/daemon/call_interfaces.c
index 92ef5d3aa3..818dd442ac 100644
--- a/daemon/call_interfaces.c
+++ b/daemon/call_interfaces.c
@@ -1945,3 +1945,13 @@ int call_interfaces_init() {
 
 	return 0;
 }
+
+
+void format_network_address(str* o, struct packet_stream *ps, struct sdp_ng_flags *flags, int keep_unspec) {
+	if (!is_addr_unspecified(&flags->parsed_media_address))
+		o->len = sprintf(o->s, "%s %s",
+						 flags->parsed_media_address.family->rfc_name,
+						 sockaddr_print_buf(&flags->parsed_media_address));
+	else
+		call_stream_address46(o->s, ps, SAF_NG, &o->len, NULL, keep_unspec);
+}
diff --git a/daemon/sdp.c b/daemon/sdp.c
index 00fa92e98f..acace8ac48 100644
--- a/daemon/sdp.c
+++ b/daemon/sdp.c
@@ -1571,7 +1571,7 @@ static int replace_network_address(struct sdp_chopper *chop, struct network_addr
 		struct packet_stream *ps, struct sdp_ng_flags *flags, int keep_unspec)
 {
 	char buf[64];
-	int len;
+	str res = { buf, 0 };
 	struct packet_stream *sink = packet_stream_sink(ps);
 
 	if (is_addr_unspecified(&address->parsed)
@@ -1583,14 +1583,9 @@ static int replace_network_address(struct sdp_chopper *chop, struct network_addr
 
 	if (flags->media_address.s && is_addr_unspecified(&flags->parsed_media_address))
 		__parse_address(&flags->parsed_media_address, NULL, NULL, &flags->media_address);
-
-	if (!is_addr_unspecified(&flags->parsed_media_address))
-		len = sprintf(buf, "%s %s",
-				flags->parsed_media_address.family->rfc_name,
-				sockaddr_print_buf(&flags->parsed_media_address));
-	else
-		call_stream_address46(buf, ps, SAF_NG, &len, NULL, keep_unspec);
-	chopper_append(chop, buf, len);
+	
+	format_network_address(&res, ps, flags, keep_unspec);
+	chopper_append(chop, res.s, res.len);
 
 	if (skip_over(chop, &address->address))
 		return -1;
diff --git a/include/call_interfaces.h b/include/call_interfaces.h
index f225e7450f..2b81797eb8 100644
--- a/include/call_interfaces.h
+++ b/include/call_interfaces.h
@@ -124,5 +124,6 @@ void ng_call_stats(struct call *call, const str *fromtag, const str *totag, benc
 
 int call_interfaces_init(void);
 
+void format_network_address(str* o, struct packet_stream *ps, struct sdp_ng_flags *flags, int keep_unspec);
 
 #endif