chan_sip: Allow Asterisk to retry after 403 on register

This adds a global option in chan_sip to allow it to continue
attempting registration if a 403 is received, clearing the cached nonce
and treating it as a non-fatal response. Normally, this would cause
registration attempts to that endpoint to stop.

(closes issue ASTERISK-17138)
Review: https://reviewboard.asterisk.org/r/2874/
Reported by: Rudi
........

Merged revisions 400137 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@400140 65c4cc65-6c06-0410-ace0-fbb531ad65f3

UPGRADE.txt

@@ -26,6 +26,9 @@ From 11.5 to 11.6:
   returning RESULT_SUCCESS even if there was an error.
 * The libuuid development library is now optional for res_rtp_asterisk. If the
   library is not present when building ICE and TURN support will not be present.
+* The option "register_retry_403" has been added to chan_sip to work around
+  servers that are known to erroneously send 403 in response to valid
+  REGISTER requests and allows Asterisk to continue attepmting to connect.
 
 From 11.4 to 11.5:
 * The default settings for chan_sip are now overriden properly by the general

channels/chan_sip.c

@@ -770,6 +770,7 @@ static int global_rtpholdtimeout;   /*!< Time out call if no RTP during hold */
 static int global_rtpkeepalive;     /*!< Send RTP keepalives */
 static int global_reg_timeout;      /*!< Global time between attempts for outbound registrations */
 static int global_regattempts_max;  /*!< Registration attempts before giving up */
+static int global_reg_retry_403;    /*!< Treat 403 responses to registrations as 401 responses */
 static int global_shrinkcallerid;   /*!< enable or disable shrinking of caller id  */
 static int global_callcounter;      /*!< Enable call counters for all devices. This is currently enabled by setting the peer
                                      *   call-limit to INT_MAX. When we remove the call-limit from the code, we can make it
@@ -20683,6 +20684,7 @@ static char *sip_show_settings(struct ast_cli_entry *e, int cmd, struct ast_cli_
 	ast_cli(a->fd, "  Sub. max duration:      %d secs\n", max_subexpiry);
 	ast_cli(a->fd, "  Outbound reg. timeout:  %d secs\n", global_reg_timeout);
 	ast_cli(a->fd, "  Outbound reg. attempts: %d\n", global_regattempts_max);
+	ast_cli(a->fd, "  Outbound reg. retry 403:%d\n", global_reg_retry_403);
 	ast_cli(a->fd, "  Notify ringing state:   %s\n", AST_CLI_YESNO(sip_cfg.notifyringing));
 	if (sip_cfg.notifyringing) {
 		ast_cli(a->fd, "    Include CID:          %s%s\n",
@@ -31390,6 +31392,7 @@ static int reload_config(enum channelreloadreason reason)
 	sip_cfg.compactheaders = DEFAULT_COMPACTHEADERS;
 	global_reg_timeout = DEFAULT_REGISTRATION_TIMEOUT;
 	global_regattempts_max = 0;
+	global_reg_retry_403 = 0;
 	sip_cfg.pedanticsipchecking = DEFAULT_PEDANTIC;
 	sip_cfg.autocreatepeer = DEFAULT_AUTOCREATEPEER;
 	global_autoframing = 0;
@@ -31777,6 +31780,8 @@ static int reload_config(enum channelreloadreason reason)
 			}
 		} else if (!strcasecmp(v->name, "registerattempts")) {
 			global_regattempts_max = atoi(v->value);
+		} else if (!strcasecmp(v->name, "register_retry_403")) {
+			global_reg_retry_403 = ast_true(v->value);
 		} else if (!strcasecmp(v->name, "bindaddr") || !strcasecmp(v->name, "udpbindaddr")) {
 			if (ast_parse_arg(v->value, PARSE_ADDR, &bindaddr)) {
 				ast_log(LOG_WARNING, "Invalid address: %s\n", v->value);

configs/sip.conf.sample

@@ -774,6 +774,9 @@ srvlookup=yes                   ; Enable DNS SRV lookups on outbound calls
                                 ; 0 = continue forever, hammering the other server
                                 ; until it accepts the registration
                                 ; Default is 0 tries, continue forever
+;register_retry_403=yes         ; Treat 403 responses to registrations as if they were
+                                ; 401 responses and continue retrying according to normal
+                                ; retry rules.
 
 ;----------------------------------------- OUTBOUND MWI SUBSCRIPTIONS -------------------------
 ; Asterisk can subscribe to receive the MWI from another SIP server and store it locally for retrieval