--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libsip/resp_ident.h	Sat Sep 24 15:13:53 2022 -0800
@@ -0,0 +1,13 @@
+/*
+ * Here we define struct sip_resp_ident, a structure that captures
+ * Call-ID and CSeq headers from initial parsing of SIP responses,
+ * allowing these responses to be matched with call state and
+ * with UAC requests that elicited them.
+ */
+
+struct sip_resp_ident {
+	char		*call_id;
+	unsigned	cseq_num;
+	char		*cseq_method;
+	char		*error_field;
+};