[asterisk-commits] twilson: trunk r373691 - in /trunk: ./ channels/ channels/sip/include/ configs/
SVN commits to the Asterisk project
asterisk-commits at lists.digium.com
Tue Sep 25 14:08:09 CDT 2012
Author: twilson
Date: Tue Sep 25 14:08:02 2012
New Revision: 373691
URL: http://svnview.digium.com/svn/asterisk?view=rev&rev=373691
Log:
Properly handle UAC/UAS roles for SIP session timers
The SIP session timer mechanism contains a mandatory 'refresher' parameter
(included in the Session-Expires header) which is used in the session timer
offer/answer signaling within a SIP Invite dialog. It looks like asterisk is
interpreting the uac resp. uas role only as the initial role of client and
server (caller is uac, callee is uas). The standard rfc 4028 however assigns
the client role to the ((RE)-Invite) requester, the server role to the
((RE)-Invite) responder.
This patch has Asterisk track the actual refresher as "us" or "them" as opposed
to relying on just the configured "uas" or "uac" properties.
(closes issue AST-922)
Reported by: Thomas Airmont
Review: https://reviewboard.asterisk.org/r/2118/
........
Merged revisions 373652 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........
Merged revisions 373665 from http://svn.asterisk.org/svn/asterisk/branches/10
........
Merged revisions 373690 from http://svn.asterisk.org/svn/asterisk/branches/11
Modified:
trunk/ (props changed)
trunk/channels/chan_sip.c
trunk/channels/sip/include/sip.h
trunk/configs/sip.conf.sample
Propchange: trunk/
------------------------------------------------------------------------------
Binary property 'branch-11-merged' - no diff available.
Modified: trunk/channels/chan_sip.c
URL: http://svnview.digium.com/svn/asterisk/trunk/channels/chan_sip.c?view=diff&rev=373691&r1=373690&r2=373691
==============================================================================
--- trunk/channels/chan_sip.c (original)
+++ trunk/channels/chan_sip.c Tue Sep 25 14:08:02 2012
@@ -795,7 +795,7 @@
static int global_qualify_peers; /*!< Number of peers to poke at a given time */
static enum st_mode global_st_mode; /*!< Mode of operation for Session-Timers */
-static enum st_refresher global_st_refresher; /*!< Session-Timer refresher */
+static enum st_refresher_param global_st_refresher; /*!< Session-Timer refresher */
static int global_min_se; /*!< Lowest threshold for session refresh interval */
static int global_max_se; /*!< Highest threshold for session refresh interval */
@@ -1666,8 +1666,8 @@
static void stop_session_timer(struct sip_pvt *p);
static void start_session_timer(struct sip_pvt *p);
static void restart_session_timer(struct sip_pvt *p);
-static const char *strefresher2str(enum st_refresher r);
-static int parse_session_expires(const char *p_hdrval, int *const p_interval, enum st_refresher *const p_ref);
+static const char *strefresherparam2str(enum st_refresher r);
+static int parse_session_expires(const char *p_hdrval, int *const p_interval, enum st_refresher_param *const p_ref);
static int parse_minse(const char *p_hdrval, int *const p_interval);
static int st_get_se(struct sip_pvt *, int max);
static enum st_refresher st_get_refresher(struct sip_pvt *);
@@ -11387,7 +11387,7 @@
if (p->method == SIP_INVITE && p->stimer && p->stimer->st_active == TRUE && p->stimer->st_active_peer_ua == TRUE) {
char se_hdr[256];
snprintf(se_hdr, sizeof(se_hdr), "%d;refresher=%s", p->stimer->st_interval,
- strefresher2str(p->stimer->st_ref));
+ p->stimer->st_ref == SESSION_TIMER_REFRESHER_US ? "uas" : "uac");
add_header(resp, "Session-Expires", se_hdr);
}
@@ -11554,7 +11554,7 @@
&& sipmethod == SIP_INVITE) {
char se_hdr[256];
snprintf(se_hdr, sizeof(se_hdr), "%d;refresher=%s", p->stimer->st_interval,
- strefresher2str(p->stimer->st_ref));
+ p->stimer->st_ref == SESSION_TIMER_REFRESHER_US ? "uac" : "uas");
add_header(req, "Session-Expires", se_hdr);
snprintf(se_hdr, sizeof(se_hdr), "%d", st_get_se(p, FALSE));
add_header(req, "Min-SE", se_hdr);
@@ -18172,21 +18172,28 @@
}
/* Session-Timer Refreshers */
+static const struct _map_x_s strefresher_params[] = {
+ { SESSION_TIMER_REFRESHER_PARAM_UNKNOWN, "unknown" },
+ { SESSION_TIMER_REFRESHER_PARAM_UAC, "uac" },
+ { SESSION_TIMER_REFRESHER_PARAM_UAS, "uas" },
+ { -1, NULL },
+};
+
static const struct _map_x_s strefreshers[] = {
- { SESSION_TIMER_REFRESHER_AUTO, "auto"},
- { SESSION_TIMER_REFRESHER_UAC, "uac"},
- { SESSION_TIMER_REFRESHER_UAS, "uas"},
- { -1, NULL},
+ { SESSION_TIMER_REFRESHER_AUTO, "auto" },
+ { SESSION_TIMER_REFRESHER_US, "us" },
+ { SESSION_TIMER_REFRESHER_THEM, "them" },
+ { -1, NULL },
};
-static const char *strefresher2str(enum st_refresher r)
-{
- return map_x_s(strefreshers, r, "Unknown");
-}
-
-static enum st_refresher str2strefresher(const char *s)
-{
- return map_s_x(strefreshers, s, -1);
+static const char *strefresherparam2str(enum st_refresher r)
+{
+ return map_x_s(strefresher_params, r, "Unknown");
+}
+
+static enum st_refresher str2strefresherparam(const char *s)
+{
+ return map_s_x(strefresher_params, s, -1);
}
/* Autocreatepeer modes */
@@ -18196,6 +18203,11 @@
{ AUTOPEERS_PERSIST, "Persisted"},
{ -1, NULL},
};
+
+static const char *strefresher2str(enum st_refresher r)
+{
+ return map_x_s(strefreshers, r, "Unknown");
+}
static const char *autocreatepeer2str(enum autocreatepeer_mode r)
{
@@ -19489,7 +19501,7 @@
}
ast_cli(fd, " Sess-Timers : %s\n", stmode2str(peer->stimer.st_mode_oper));
- ast_cli(fd, " Sess-Refresh : %s\n", strefresher2str(peer->stimer.st_ref));
+ ast_cli(fd, " Sess-Refresh : %s\n", strefresherparam2str(peer->stimer.st_ref));
ast_cli(fd, " Sess-Expires : %d secs\n", peer->stimer.st_max_se);
ast_cli(fd, " Min-Sess : %d secs\n", peer->stimer.st_min_se);
ast_cli(fd, " RTP Engine : %s\n", peer->engine);
@@ -19558,7 +19570,7 @@
astman_append(s, "SIP-T.38EC: %s\r\n", faxec2str(ast_test_flag(&peer->flags[1], SIP_PAGE2_T38SUPPORT)));
astman_append(s, "SIP-T.38MaxDtgrm: %d\r\n", peer->t38_maxdatagram);
astman_append(s, "SIP-Sess-Timers: %s\r\n", stmode2str(peer->stimer.st_mode_oper));
- astman_append(s, "SIP-Sess-Refresh: %s\r\n", strefresher2str(peer->stimer.st_ref));
+ astman_append(s, "SIP-Sess-Refresh: %s\r\n", strefresherparam2str(peer->stimer.st_ref));
astman_append(s, "SIP-Sess-Expires: %d\r\n", peer->stimer.st_max_se);
astman_append(s, "SIP-Sess-Min: %d\r\n", peer->stimer.st_min_se);
astman_append(s, "SIP-RTP-Engine: %s\r\n", peer->engine);
@@ -19704,7 +19716,7 @@
ast_cli(a->fd, " Callerid : %s\n", ast_callerid_merge(cbuf, sizeof(cbuf), user->cid_name, user->cid_num, "<unspecified>"));
ast_cli(a->fd, " ACL : %s\n", AST_CLI_YESNO(ast_acl_list_is_empty(user->acl) == 0));
ast_cli(a->fd, " Sess-Timers : %s\n", stmode2str(user->stimer.st_mode_oper));
- ast_cli(a->fd, " Sess-Refresh : %s\n", strefresher2str(user->stimer.st_ref));
+ ast_cli(a->fd, " Sess-Refresh : %s\n", strefresherparam2str(user->stimer.st_ref));
ast_cli(a->fd, " Sess-Expires : %d secs\n", user->stimer.st_max_se);
ast_cli(a->fd, " Sess-Min-SE : %d secs\n", user->stimer.st_min_se);
ast_cli(a->fd, " RTP Engine : %s\n", user->engine);
@@ -20160,7 +20172,7 @@
ast_cli(a->fd, " Outb. proxy: %s %s\n", ast_strlen_zero(sip_cfg.outboundproxy.name) ? "<not set>" : sip_cfg.outboundproxy.name,
sip_cfg.outboundproxy.force ? "(forced)" : "");
ast_cli(a->fd, " Session Timers: %s\n", stmode2str(global_st_mode));
- ast_cli(a->fd, " Session Refresher: %s\n", strefresher2str (global_st_refresher));
+ ast_cli(a->fd, " Session Refresher: %s\n", strefresherparam2str(global_st_refresher));
ast_cli(a->fd, " Session Expires: %d secs\n", global_max_se);
ast_cli(a->fd, " Session Min-SE: %d secs\n", global_min_se);
ast_cli(a->fd, " Timer T1: %d\n", global_t1);
@@ -20618,7 +20630,7 @@
ast_cli(a->fd, " S-Timer Peer Sts: %s\n", cur->stimer->st_active_peer_ua ? "Active" : "Inactive");
ast_cli(a->fd, " S-Timer Cached Min-SE: %d\n", cur->stimer->st_cached_min_se);
ast_cli(a->fd, " S-Timer Cached SE: %d\n", cur->stimer->st_cached_max_se);
- ast_cli(a->fd, " S-Timer Cached Ref: %s\n", strefresher2str(cur->stimer->st_cached_ref));
+ ast_cli(a->fd, " S-Timer Cached Ref: %s\n", strefresherparam2str(cur->stimer->st_cached_ref));
ast_cli(a->fd, " S-Timer Cached Mode: %s\n", stmode2str(cur->stimer->st_cached_mode));
}
}
@@ -22335,15 +22347,18 @@
p_hdrval = (char*)sip_get_header(req, "Session-Expires");
if (!ast_strlen_zero(p_hdrval)) {
/* UAS supports Session-Timers */
- enum st_refresher tmp_st_ref = SESSION_TIMER_REFRESHER_AUTO;
+ enum st_refresher_param st_ref_param;
int tmp_st_interval = 0;
- rtn = parse_session_expires(p_hdrval, &tmp_st_interval, &tmp_st_ref);
+ rtn = parse_session_expires(p_hdrval, &tmp_st_interval, &st_ref_param);
if (rtn != 0) {
ast_set_flag(&p->flags[0], SIP_PENDINGBYE);
}
- if (tmp_st_ref == SESSION_TIMER_REFRESHER_UAC ||
- tmp_st_ref == SESSION_TIMER_REFRESHER_UAS) {
- p->stimer->st_ref = tmp_st_ref;
+ if (st_ref_param == SESSION_TIMER_REFRESHER_PARAM_UAC) {
+ p->stimer->st_ref = SESSION_TIMER_REFRESHER_US;
+ } else if (st_ref_param == SESSION_TIMER_REFRESHER_PARAM_UAS) {
+ p->stimer->st_ref = SESSION_TIMER_REFRESHER_THEM;
+ } else {
+ ast_log(LOG_WARNING, "Unknown refresher on %s\n", p->callid);
}
if (tmp_st_interval) {
p->stimer->st_interval = tmp_st_interval;
@@ -22354,7 +22369,7 @@
} else {
/* UAS doesn't support Session-Timers */
if (st_get_mode(p, 0) == SESSION_TIMER_MODE_ORIGINATE) {
- p->stimer->st_ref = SESSION_TIMER_REFRESHER_UAC;
+ p->stimer->st_ref = SESSION_TIMER_REFRESHER_US;
p->stimer->st_active_peer_ua = FALSE;
start_session_timer(p);
}
@@ -24392,7 +24407,7 @@
int uac_min_se = -1; /* UAC's Min-SE in integer format */
int st_active = FALSE; /* Session-Timer on/off boolean */
int st_interval = 0; /* Session-Timer negotiated refresh interval */
- enum st_refresher st_ref; /* Session-Timer session refresher */
+ enum st_refresher tmp_st_ref = SESSION_TIMER_REFRESHER_AUTO; /* Session-Timer refresher */
int dlg_min_se = -1;
struct {
char exten[AST_MAX_EXTENSION];
@@ -24400,7 +24415,6 @@
} pickup = {
.exten = "",
};
- st_ref = SESSION_TIMER_REFRESHER_AUTO;
/* Find out what they support */
if (!p->sipoptions) {
@@ -24934,6 +24948,8 @@
/* Session-Timers */
if ((p->sipoptions & SIP_OPT_TIMER) && !ast_strlen_zero(sip_get_header(req, "Session-Expires"))) {
+ enum st_refresher_param st_ref_param;
+
/* The UAC has requested session-timers for this session. Negotiate
the session refresh interval and who will be the refresher */
ast_debug(2, "Incoming INVITE with 'timer' option supported and \"Session-Expires\" header.\n");
@@ -24944,7 +24960,8 @@
/* Parse the Session-Expires header */
p_uac_se_hdr = sip_get_header(req, "Session-Expires");
- rtn = parse_session_expires(p_uac_se_hdr, &uac_max_se, &st_ref);
+ rtn = parse_session_expires(p_uac_se_hdr, &uac_max_se, &st_ref_param);
+ tmp_st_ref = (st_ref_param == SESSION_TIMER_REFRESHER_PARAM_UAC) ? SESSION_TIMER_REFRESHER_THEM : SESSION_TIMER_REFRESHER_US;
if (rtn != 0) {
transmit_response_reliable(p, "400 Session-Expires Invalid Syntax", req);
p->invitestate = INV_COMPLETED;
@@ -24986,8 +25003,8 @@
p->stimer->st_active_peer_ua = TRUE;
st_active = TRUE;
- if (st_ref == SESSION_TIMER_REFRESHER_AUTO) {
- st_ref = st_get_refresher(p);
+ if (st_ref_param == SESSION_TIMER_REFRESHER_PARAM_UNKNOWN) {
+ tmp_st_ref = st_get_refresher(p);
}
if (uac_max_se > 0) {
@@ -25028,7 +25045,7 @@
case SESSION_TIMER_MODE_ORIGINATE:
st_active = TRUE;
st_interval = st_get_se(p, TRUE);
- st_ref = SESSION_TIMER_REFRESHER_UAS;
+ tmp_st_ref = SESSION_TIMER_REFRESHER_US;
p->stimer->st_active_peer_ua = FALSE;
break;
@@ -25040,9 +25057,9 @@
if (reinvite == 0) {
/* Session-Timers: Start session refresh timer based on negotiation/config */
if (st_active == TRUE) {
- p->stimer->st_active = TRUE;
+ p->stimer->st_active = TRUE;
p->stimer->st_interval = st_interval;
- p->stimer->st_ref = st_ref;
+ p->stimer->st_ref = tmp_st_ref;
start_session_timer(p);
}
} else {
@@ -25055,7 +25072,7 @@
/* The UAC may be adjusting the session-timers mid-session */
if (st_interval > 0) {
p->stimer->st_interval = st_interval;
- p->stimer->st_ref = st_ref;
+ p->stimer->st_ref = tmp_st_ref;
}
restart_session_timer(p);
@@ -28491,7 +28508,6 @@
static int proc_session_timer(const void *vp)
{
struct sip_pvt *p = (struct sip_pvt *) vp;
- int sendreinv = FALSE;
int res = 0;
if (!p->stimer) {
@@ -28509,23 +28525,7 @@
goto return_unref;
}
- switch (p->stimer->st_ref) {
- case SESSION_TIMER_REFRESHER_UAC:
- if (p->outgoing_call == TRUE) {
- sendreinv = TRUE;
- }
- break;
- case SESSION_TIMER_REFRESHER_UAS:
- if (p->outgoing_call != TRUE) {
- sendreinv = TRUE;
- }
- break;
- default:
- ast_log(LOG_ERROR, "Unknown session refresher %d\n", p->stimer->st_ref);
- goto return_unref;
- }
-
- if (sendreinv == TRUE) {
+ if (p->stimer->st_ref == SESSION_TIMER_REFRESHER_US) {
res = 1;
transmit_reinvite_with_sdp(p, FALSE, TRUE);
} else {
@@ -28594,7 +28594,7 @@
/*! \brief Session-Timers: Function for parsing Session-Expires header */
-int parse_session_expires(const char *p_hdrval, int *const p_interval, enum st_refresher *const p_ref)
+int parse_session_expires(const char *p_hdrval, int *const p_interval, enum st_refresher_param *const p_ref)
{
char *p_token;
int ref_idx;
@@ -28605,7 +28605,7 @@
return -1;
}
- *p_ref = SESSION_TIMER_REFRESHER_AUTO;
+ *p_ref = SESSION_TIMER_REFRESHER_PARAM_UNKNOWN;
*p_interval = 0;
p_se_hdr = ast_strdupa(p_hdrval);
@@ -28630,10 +28630,10 @@
p_se_hdr = ast_skip_blanks(p_se_hdr);
if (!strncasecmp(p_se_hdr, "uac", strlen("uac"))) {
- *p_ref = SESSION_TIMER_REFRESHER_UAC;
+ *p_ref = SESSION_TIMER_REFRESHER_PARAM_UAC;
ast_debug(2, "Refresher: UAC\n");
} else if (!strncasecmp(p_se_hdr, "uas", strlen("uas"))) {
- *p_ref = SESSION_TIMER_REFRESHER_UAS;
+ *p_ref = SESSION_TIMER_REFRESHER_PARAM_UAS;
ast_debug(2, "Refresher: UAS\n");
} else {
ast_log(LOG_WARNING, "Invalid refresher value %s\n", p_se_hdr);
@@ -28705,20 +28705,24 @@
/*! \brief Get the entity (UAC or UAS) that's acting as the session-timer refresher
+ * \note This is only called when processing an INVITE, so in that case Asterisk is
+ * always currently the UAS. If this is ever used to process responses, the
+ * function will have to be changed.
* \param p pointer to the SIP dialog
*/
enum st_refresher st_get_refresher(struct sip_pvt *p)
{
- if (p->stimer->st_cached_ref != SESSION_TIMER_REFRESHER_AUTO)
+ if (p->stimer->st_cached_ref != SESSION_TIMER_REFRESHER_AUTO) {
return p->stimer->st_cached_ref;
+ }
if (p->relatedpeer) {
- p->stimer->st_cached_ref = p->relatedpeer->stimer.st_ref;
+ p->stimer->st_cached_ref = (p->relatedpeer->stimer.st_ref == SESSION_TIMER_REFRESHER_PARAM_UAC) ? SESSION_TIMER_REFRESHER_THEM : SESSION_TIMER_REFRESHER_US;
return p->stimer->st_cached_ref;
}
- p->stimer->st_cached_ref = global_st_refresher;
- return global_st_refresher;
+ p->stimer->st_cached_ref = (global_st_refresher == SESSION_TIMER_REFRESHER_PARAM_UAC) ? SESSION_TIMER_REFRESHER_THEM : SESSION_TIMER_REFRESHER_US;
+ return p->stimer->st_cached_ref;
}
@@ -30248,7 +30252,7 @@
peer->stimer.st_min_se = global_min_se;
}
} else if (!strcasecmp(v->name, "session-refresher")) {
- int i = (int) str2strefresher(v->value);
+ int i = (int) str2strefresherparam(v->value);
if (i < 0) {
ast_log(LOG_WARNING, "Invalid session-refresher '%s' at line %d of %s\n", v->value, v->lineno, config);
peer->stimer.st_ref = global_st_refresher;
@@ -30782,7 +30786,7 @@
/* Session-Timers */
global_st_mode = SESSION_TIMER_MODE_ACCEPT;
- global_st_refresher = SESSION_TIMER_REFRESHER_UAS;
+ global_st_refresher = SESSION_TIMER_REFRESHER_PARAM_UAS;
global_min_se = DEFAULT_MIN_SE;
global_max_se = DEFAULT_MAX_SE;
@@ -31331,10 +31335,10 @@
global_min_se = DEFAULT_MIN_SE;
}
} else if (!strcasecmp(v->name, "session-refresher")) {
- int i = (int) str2strefresher(v->value);
+ int i = (int) str2strefresherparam(v->value);
if (i < 0) {
ast_log(LOG_WARNING, "Invalid session-refresher '%s' at line %d of %s\n", v->value, v->lineno, config);
- global_st_refresher = SESSION_TIMER_REFRESHER_UAS;
+ global_st_refresher = SESSION_TIMER_REFRESHER_PARAM_UAS;
} else {
global_st_refresher = i;
}
Modified: trunk/channels/sip/include/sip.h
URL: http://svnview.digium.com/svn/asterisk/trunk/channels/sip/include/sip.h?view=diff&rev=373691&r1=373690&r2=373691
==============================================================================
--- trunk/channels/sip/include/sip.h (original)
+++ trunk/channels/sip/include/sip.h Tue Sep 25 14:08:02 2012
@@ -556,9 +556,15 @@
/*! \brief The entity playing the refresher role for Session-Timers */
enum st_refresher {
- SESSION_TIMER_REFRESHER_AUTO, /*!< Negotiated */
- SESSION_TIMER_REFRESHER_UAC, /*!< Session is refreshed by the UAC */
- SESSION_TIMER_REFRESHER_UAS /*!< Session is refreshed by the UAS */
+ SESSION_TIMER_REFRESHER_AUTO, /*!< Negotiated */
+ SESSION_TIMER_REFRESHER_US, /*!< Initially prefer session refresh by Asterisk */
+ SESSION_TIMER_REFRESHER_THEM, /*!< Initially prefer session refresh by the other side */
+};
+
+enum st_refresher_param {
+ SESSION_TIMER_REFRESHER_PARAM_UNKNOWN,
+ SESSION_TIMER_REFRESHER_PARAM_UAC,
+ SESSION_TIMER_REFRESHER_PARAM_UAS,
};
/*! \brief Define some implemented SIP transports
@@ -954,14 +960,14 @@
struct sip_st_dlg {
int st_active; /*!< Session-Timers on/off */
int st_interval; /*!< Session-Timers negotiated session refresh interval */
+ enum st_refresher st_ref; /*!< Session-Timers cached refresher */
int st_schedid; /*!< Session-Timers ast_sched scheduler id */
- enum st_refresher st_ref; /*!< Session-Timers session refresher */
int st_expirys; /*!< Session-Timers number of expirys */
int st_active_peer_ua; /*!< Session-Timers on/off in peer UA */
int st_cached_min_se; /*!< Session-Timers cached Min-SE */
int st_cached_max_se; /*!< Session-Timers cached Session-Expires */
enum st_mode st_cached_mode; /*!< Session-Timers cached M.O. */
- enum st_refresher st_cached_ref; /*!< Session-Timers cached refresher */
+ enum st_refresher st_cached_ref; /*!< Session-Timers session refresher */
unsigned char quit_flag:1; /*!< Stop trying to lock; just quit */
};
@@ -970,10 +976,10 @@
* of SIP Session-Timers feature on a per user/peer basis.
*/
struct sip_st_cfg {
- enum st_mode st_mode_oper; /*!< Mode of operation for Session-Timers */
- enum st_refresher st_ref; /*!< Session-Timer refresher */
- int st_min_se; /*!< Lowest threshold for session refresh interval */
- int st_max_se; /*!< Highest threshold for session refresh interval */
+ enum st_mode st_mode_oper; /*!< Mode of operation for Session-Timers */
+ enum st_refresher_param st_ref; /*!< Session-Timer refresher */
+ int st_min_se; /*!< Lowest threshold for session refresh interval */
+ int st_max_se; /*!< Highest threshold for session refresh interval */
};
/*! \brief Structure for remembering offered media in an INVITE, to make sure we reply
Modified: trunk/configs/sip.conf.sample
URL: http://svnview.digium.com/svn/asterisk/trunk/configs/sip.conf.sample?view=diff&rev=373691&r1=373690&r2=373691
==============================================================================
--- trunk/configs/sip.conf.sample (original)
+++ trunk/configs/sip.conf.sample Tue Sep 25 14:08:02 2012
@@ -597,11 +597,20 @@
; * session-expires - Maximum session refresh interval in seconds. Defaults to 1800 secs.
; * session-minse - Minimum session refresh interval in seconds. Defualts to 90 secs.
; * session-refresher - The session refresher (uac|uas). Defaults to 'uas'.
+; uac - Default to the caller initially refreshing when possible
+; uas - Default to the callee initially refreshing when possible
+;
+; Note that, due to recommendations in RFC 4028, Asterisk will always honor the other
+; endpoint's preference for who will handle refreshes. Asterisk will never override the
+; preferences of the other endpoint. Doing so could result in Asterisk and the endpoint
+; fighting over who sends the refreshes. This holds true for the initiation of session
+; timers and subsequent re-INVITE requests whether Asterisk is the caller or callee, or
+; whether Asterisk is currently the refresher or not.
;
;session-timers=originate
;session-expires=600
;session-minse=90
-;session-refresher=uas
+;session-refresher=uac
;
;--------------------------- SIP DEBUGGING ---------------------------------------------------
;sipdebug = yes ; Turn on SIP debugging by default, from
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