Handle Session-Expires less than local Min-SE in 200 OK

Ensure that a call is immediately torn down if a Session-Expires value
received in a 200 OK is less than the local Min-SE. This also prevents
Asterisk from allowing calls with Session-Expires below the
RFC4028-mandated minimum (90s).

(closes issue ASTERISK-20653)
Review: https://reviewboard.asterisk.org/r/2237/
Patch-by: Kinsey Moore
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Merged revisions 377623 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 377624 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@377625 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -22627,6 +22627,9 @@ static void handle_response_invite(struct sip_pvt *p, int resp, const char *rest
 				rtn = parse_session_expires(p_hdrval, &tmp_st_interval, &st_ref_param);
 				if (rtn != 0) {
 					ast_set_flag(&p->flags[0], SIP_PENDINGBYE);	
+				} else if (tmp_st_interval < st_get_se(p, FALSE)) {
+					ast_log(LOG_WARNING, "Got Session-Expires less than local Min-SE in 200 OK, tearing down call\n");
+					ast_set_flag(&p->flags[0], SIP_PENDINGBYE);
 				}
 				if (st_ref_param == SESSION_TIMER_REFRESHER_PARAM_UAC) {
 				   p->stimer->st_ref = SESSION_TIMER_REFRESHER_US;