> +	s_port.len = rtpengine_dtmf_event_sock.s + rtpengine_dtmf_event_sock.len - s_port.s;
+
+	if (s_port.len <= 0 || str2int(&s_port, &port) < 0 || port > 65535) {
+		LM_ERR("failed to initialize dtmf event listener because port is invalid %.*s\n", rtpengine_dtmf_event_sock.len, rtpengine_dtmf_event_sock.s);
+		return;
+	}
+	rtpengine_dtmf_event_sock.len -= s_port.len + 1;
+	trim(&rtpengine_dtmf_event_sock);
+	rtpengine_dtmf_event_sock.s[rtpengine_dtmf_event_sock.len] = '\0';
+
+	memset(&udp_addr, 0, sizeof(udp_addr));
+
+	if (rtpengine_dtmf_event_sock.s[0] == '[') {
+		udp_addr.sin6.sin6_family = AF_INET6;
+		udp_addr.sin6.sin6_port = htons(port);
+		ret = inet_pton(AF_INET, rtpengine_dtmf_event_sock.s, &udp_addr.sin6.sin6_addr);