diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index f648454..d6be92b 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -19266,6 +19266,33 @@ static int set_message_vars_from_req(struct ast_msg *msg, struct sip_request *re
        return res;
 }

+static void fill_sip_headers_hash(struct ast_channel *channel, struct sip_request *req)
+{
+       size_t x;
+       char name_buf[1024];
+       char val_buf[1024];
+       char hash_buf[1024 + sizeof("HASH_SIP(HEADERS,)")];
+       const char *name;
+       char *c;
+
+       for (x = 0; x < req->headers; x++) {
+               const char *header = REQ_OFFSET_TO_STR(req, header[x]);
+
+               if ((c = strchr(header, ':'))) {
+                       ast_copy_string(name_buf, header, MIN((c - header + 1), sizeof(name_buf)));
+                       ast_copy_string(val_buf, ast_skip_blanks(c + 1), sizeof(val_buf));
+                       ast_trim_blanks(name_buf);
+
+                       /* Convert header name to full name alias. */
+                       name = find_full_alias(name_buf, name_buf);
+
+                       snprintf(hash_buf, sizeof(hash_buf), "HASH(SIP_HEADERS,%s)", name);
+
+                       ast_func_write(channel, hash_buf, val_buf);
+               }
+       }
+}
+
 /*! \brief  Receive SIP MESSAGE method messages
 \note  We only handle messages within current calls currently
        Reference: RFC 3428 */
@@ -26268,6 +26295,8 @@ static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, str
                        build_route(p, req, 0, 0);

                        if (c) {
+                               fill_sip_headers_hash(c, req);
+
                                ast_party_redirecting_init(&redirecting);
                                memset(&update_redirecting, 0, sizeof(update_redirecting));
                                change_redirecting_information(p, req, &redirecting, &update_redirecting,