config_global.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2013, Digium, Inc.
 *
 * Mark Michelson <mmichelson@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */
 
#include "asterisk.h"
 
#include <pjsip.h>
#include <pjlib.h>
 
#include "asterisk/res_pjsip.h"
#include "include/res_pjsip_private.h"
#include "asterisk/pbx.h"
#include "asterisk/sorcery.h"
#include "asterisk/taskprocessor.h"
#include "asterisk/ast_version.h"
#include "asterisk/res_pjsip_cli.h"
 
#define DEFAULT_MAX_FORWARDS 70
#define DEFAULT_KEEPALIVE_INTERVAL 90
#define DEFAULT_USERAGENT_PREFIX "Asterisk PBX"
#define DEFAULT_OUTBOUND_ENDPOINT "default_outbound_endpoint"
#define DEFAULT_DEBUG "no"
#define DEFAULT_ENDPOINT_IDENTIFIER_ORDER "ip,username,anonymous"
#define DEFAULT_MAX_INITIAL_QUALIFY_TIME 0
#define DEFAULT_FROM_USER "asterisk"
#define DEFAULT_REALM "asterisk"
#define DEFAULT_REGCONTEXT ""
#define DEFAULT_CONTACT_EXPIRATION_CHECK_INTERVAL 30
#define DEFAULT_DISABLE_MULTI_DOMAIN 0
#define DEFAULT_VOICEMAIL_EXTENSION ""
#define DEFAULT_UNIDENTIFIED_REQUEST_COUNT 5
#define DEFAULT_UNIDENTIFIED_REQUEST_PERIOD 5
#define DEFAULT_UNIDENTIFIED_REQUEST_PRUNE_INTERVAL 30
#define DEFAULT_MWI_TPS_QUEUE_HIGH AST_TASKPROCESSOR_HIGH_WATER_LEVEL
#define DEFAULT_MWI_TPS_QUEUE_LOW -1
#define DEFAULT_MWI_DISABLE_INITIAL_UNSOLICITED 0
#define DEFAULT_ALLOW_SENDING_180_AFTER_183 0
#define DEFAULT_IGNORE_URI_USER_OPTIONS 0
#define DEFAULT_USE_CALLERID_CONTACT 0
#define DEFAULT_SEND_CONTACT_STATUS_ON_UPDATE_REGISTRATION 0
#define DEFAULT_TASKPROCESSOR_OVERLOAD_TRIGGER TASKPROCESSOR_OVERLOAD_TRIGGER_GLOBAL
#define DEFAULT_NOREFERSUB 1
 
/*!
 * \brief Cached global config object
 *
 * \details
 * Cached so we don't have to keep asking sorcery for the config.
 * We could ask for it hundreds of times a second if not more.
 */
static AO2_GLOBAL_OBJ_STATIC(global_cfg);
 
static char default_useragent[256];
 
struct global_config {
    SORCERY_OBJECT(details);
    AST_DECLARE_STRING_FIELDS(
        AST_STRING_FIELD(useragent);
        AST_STRING_FIELD(regcontext);
        AST_STRING_FIELD(default_outbound_endpoint);
        /*! Debug logging yes|no|host */
        AST_STRING_FIELD(debug);
        /*! Order by which endpoint identifiers are checked (comma separated list) */
        AST_STRING_FIELD(endpoint_identifier_order);
        /*! User name to place in From header if there is no better option */
        AST_STRING_FIELD(default_from_user);
        /*! Default voicemail extension */
        AST_STRING_FIELD(default_voicemail_extension);
        /*! Realm to use in challenges before an endpoint is identified */
        AST_STRING_FIELD(default_realm);
    );
    /*! Value to put in Max-Forwards header */
    unsigned int max_forwards;
    /*! The interval at which to send keep alive messages to active connection-oriented transports */
    unsigned int keep_alive_interval;
    /*! The maximum time for all contacts to be qualified at startup */
    unsigned int max_initial_qualify_time;
    /*! The interval at which to check for expired contacts */
    unsigned int contact_expiration_check_interval;
    /*! Nonzero to disable multi domain support */
    unsigned int disable_multi_domain;
    /*! Nonzero to disable changing 180/SDP to 183/SDP */
    unsigned int allow_sending_180_after_183;
    /*! The maximum number of unidentified requests per source IP address before a security event is logged */
    unsigned int unidentified_request_count;
    /*! The period during which unidentified requests are accumulated */
    unsigned int unidentified_request_period;
    /*! Interval at which expired unidentified requests will be pruned */
    unsigned int unidentified_request_prune_interval;
    struct {
        /*! Taskprocessor high water alert trigger level */
        unsigned int tps_queue_high;
        /*! Taskprocessor low water clear alert level. */
        int tps_queue_low;
        /*! Nonzero to disable sending unsolicited mwi to all endpoints on startup */
        unsigned int disable_initial_unsolicited;
    } mwi;
    /*! Nonzero if URI user field options are ignored. */
    unsigned int ignore_uri_user_options;
    /*! Nonzero if CALLERID(num) is to be used as the default contact username instead of default_from_user */
    unsigned int use_callerid_contact;
    /*! Nonzero if need to send AMI ContactStatus event when a contact is updated */
    unsigned int send_contact_status_on_update_registration;
    /*! Trigger the distributor should use to pause accepting new dialogs */
    enum ast_sip_taskprocessor_overload_trigger overload_trigger;
    /*! Nonzero if norefersub is to be sent in Supported header */
    unsigned int norefersub;
};
 
static void global_destructor(void *obj)
{
    struct global_config *cfg = obj;
 
    ast_string_field_free_memory(cfg);
}
 
static void *global_alloc(const char *name)
{
    struct global_config *cfg;
 
    cfg = ast_sorcery_generic_alloc(sizeof(*cfg), global_destructor);
    if (!cfg || ast_string_field_init(cfg, 100)) {
        ao2_cleanup(cfg);
        return NULL;
    }
 
    return cfg;
}
 
/*
 * There is ever only one global section, so we can use a single global
 * value here to track the regcontext through reloads.
 */
static char *previous_regcontext = NULL;
 
static int check_regcontext(const struct global_config *cfg)
{
    char *current = NULL;
 
    if (previous_regcontext && !strcmp(previous_regcontext, cfg->regcontext)) {
        /* Nothing changed so nothing to do */
        return 0;
    }
 
    if (!ast_strlen_zero(cfg->regcontext)) {
        current = ast_strdup(cfg->regcontext);
        if (!current) {
            return -1;
        }
 
        if (ast_sip_persistent_endpoint_add_to_regcontext(cfg->regcontext)) {
            ast_free(current);
            return -1;
        }
    }
 
    if (!ast_strlen_zero(previous_regcontext)) {
        ast_context_destroy_by_name(previous_regcontext, "PJSIP");
        ast_free(previous_regcontext);
        previous_regcontext = NULL;
    }
 
    if (current) {
        previous_regcontext = current;
    }
 
    return 0;
}
 
static int global_apply(const struct ast_sorcery *sorcery, void *obj)
{
    struct global_config *cfg = obj;
    char max_forwards[10];
 
    if (ast_strlen_zero(cfg->debug)) {
        ast_log(LOG_ERROR,
            "Global option 'debug' can't be empty.  Set it to a valid value or remove the entry to accept 'no' as the default\n");
        return -1;
    }
 
    if (ast_strlen_zero(cfg->default_from_user)) {
        ast_log(LOG_ERROR,
            "Global option 'default_from_user' can't be empty.  Set it to a valid value or remove the entry to accept 'asterisk' as the default\n");
        return -1;
    }
 
    snprintf(max_forwards, sizeof(max_forwards), "%u", cfg->max_forwards);
 
    ast_sip_add_global_request_header("Max-Forwards", max_forwards, 1);
    ast_sip_add_global_request_header("User-Agent", cfg->useragent, 1);
    ast_sip_add_global_response_header("Server", cfg->useragent, 1);
 
    if (check_regcontext(cfg)) {
        return -1;
    }
 
    ao2_t_global_obj_replace_unref(global_cfg, cfg, "Applying global settings");
    return 0;
}
 
static struct global_config *get_global_cfg(void)
{
    return ao2_global_obj_ref(global_cfg);
}
 
char *ast_sip_global_default_outbound_endpoint(void)
{
    char *str;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return ast_strdup(DEFAULT_OUTBOUND_ENDPOINT);
    }
 
    str = ast_strdup(cfg->default_outbound_endpoint);
    ao2_ref(cfg, -1);
    return str;
}
 
char *ast_sip_get_debug(void)
{
    char *res;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return ast_strdup(DEFAULT_DEBUG);
    }
 
    res = ast_strdup(cfg->debug);
    ao2_ref(cfg, -1);
    return res;
}
 
char *ast_sip_get_regcontext(void)
{
    char *res;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return ast_strdup(DEFAULT_REGCONTEXT);
    }
 
    res = ast_strdup(cfg->regcontext);
    ao2_ref(cfg, -1);
 
    return res;
}
 
char *ast_sip_get_default_voicemail_extension(void)
{
    char *res;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return ast_strdup(DEFAULT_VOICEMAIL_EXTENSION);
    }
 
    res = ast_strdup(cfg->default_voicemail_extension);
    ao2_ref(cfg, -1);
 
    return res;
}
 
char *ast_sip_get_endpoint_identifier_order(void)
{
    char *res;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return ast_strdup(DEFAULT_ENDPOINT_IDENTIFIER_ORDER);
    }
 
    res = ast_strdup(cfg->endpoint_identifier_order);
    ao2_ref(cfg, -1);
    return res;
}
 
unsigned int ast_sip_get_keep_alive_interval(void)
{
    unsigned int interval;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return DEFAULT_KEEPALIVE_INTERVAL;
    }
 
    interval = cfg->keep_alive_interval;
    ao2_ref(cfg, -1);
    return interval;
}
 
unsigned int ast_sip_get_contact_expiration_check_interval(void)
{
    unsigned int interval;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return DEFAULT_CONTACT_EXPIRATION_CHECK_INTERVAL;
    }
 
    interval = cfg->contact_expiration_check_interval;
    ao2_ref(cfg, -1);
    return interval;
}
 
unsigned int ast_sip_get_disable_multi_domain(void)
{
    unsigned int disable_multi_domain;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return DEFAULT_DISABLE_MULTI_DOMAIN;
    }
 
    disable_multi_domain = cfg->disable_multi_domain;
    ao2_ref(cfg, -1);
    return disable_multi_domain;
}
 
unsigned int ast_sip_get_max_initial_qualify_time(void)
{
    unsigned int time;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return DEFAULT_MAX_INITIAL_QUALIFY_TIME;
    }
 
    time = cfg->max_initial_qualify_time;
    ao2_ref(cfg, -1);
    return time;
}
 
void ast_sip_get_unidentified_request_thresholds(unsigned int *count, unsigned int *period,
    unsigned int *prune_interval)
{
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        *count = DEFAULT_UNIDENTIFIED_REQUEST_COUNT;
        *period = DEFAULT_UNIDENTIFIED_REQUEST_PERIOD;
        *prune_interval = DEFAULT_UNIDENTIFIED_REQUEST_PRUNE_INTERVAL;
        return;
    }
 
    *count = cfg->unidentified_request_count;
    *period = cfg->unidentified_request_period;
    *prune_interval = cfg->unidentified_request_prune_interval;
 
    ao2_ref(cfg, -1);
    return;
}
 
void ast_sip_get_default_realm(char *realm, size_t size)
{
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        ast_copy_string(realm, DEFAULT_REALM, size);
    } else {
        ast_copy_string(realm, cfg->default_realm, size);
        ao2_ref(cfg, -1);
    }
}
 
void ast_sip_get_default_from_user(char *from_user, size_t size)
{
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        ast_copy_string(from_user, DEFAULT_FROM_USER, size);
    } else {
        ast_copy_string(from_user, cfg->default_from_user, size);
        ao2_ref(cfg, -1);
    }
}
 
 
unsigned int ast_sip_get_mwi_tps_queue_high(void)
{
    unsigned int tps_queue_high;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return DEFAULT_MWI_TPS_QUEUE_HIGH;
    }
 
    tps_queue_high = cfg->mwi.tps_queue_high;
    ao2_ref(cfg, -1);
    return tps_queue_high;
}
 
int ast_sip_get_mwi_tps_queue_low(void)
{
    int tps_queue_low;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return DEFAULT_MWI_TPS_QUEUE_LOW;
    }
 
    tps_queue_low = cfg->mwi.tps_queue_low;
    ao2_ref(cfg, -1);
    return tps_queue_low;
}
 
unsigned int ast_sip_get_mwi_disable_initial_unsolicited(void)
{
    unsigned int disable_initial_unsolicited;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return DEFAULT_MWI_DISABLE_INITIAL_UNSOLICITED;
    }
 
    disable_initial_unsolicited = cfg->mwi.disable_initial_unsolicited;
    ao2_ref(cfg, -1);
    return disable_initial_unsolicited;
}
 
unsigned int ast_sip_get_allow_sending_180_after_183(void)
{
    unsigned int allow_sending_180_after_183;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return DEFAULT_ALLOW_SENDING_180_AFTER_183;
    }
 
    allow_sending_180_after_183 = cfg->allow_sending_180_after_183;
    ao2_ref(cfg, -1);
    return allow_sending_180_after_183;
}
 
unsigned int ast_sip_get_ignore_uri_user_options(void)
{
    unsigned int ignore_uri_user_options;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return DEFAULT_IGNORE_URI_USER_OPTIONS;
    }
 
    ignore_uri_user_options = cfg->ignore_uri_user_options;
    ao2_ref(cfg, -1);
    return ignore_uri_user_options;
}
 
unsigned int ast_sip_get_use_callerid_contact(void)
{
    unsigned int use_callerid_contact;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return DEFAULT_USE_CALLERID_CONTACT;
    }
 
    use_callerid_contact = cfg->use_callerid_contact;
    ao2_ref(cfg, -1);
    return use_callerid_contact;
}
 
unsigned int ast_sip_get_send_contact_status_on_update_registration(void)
{
    unsigned int send_contact_status_on_update_registration;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return DEFAULT_SEND_CONTACT_STATUS_ON_UPDATE_REGISTRATION;
    }
 
    send_contact_status_on_update_registration = cfg->send_contact_status_on_update_registration;
    ao2_ref(cfg, -1);
    return send_contact_status_on_update_registration;
}
 
enum ast_sip_taskprocessor_overload_trigger ast_sip_get_taskprocessor_overload_trigger(void)
{
    enum ast_sip_taskprocessor_overload_trigger trigger;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return DEFAULT_TASKPROCESSOR_OVERLOAD_TRIGGER;
    }
 
    trigger = cfg->overload_trigger;
    ao2_ref(cfg, -1);
    return trigger;
}
 
unsigned int ast_sip_get_norefersub(void)
{
    unsigned int norefersub;
    struct global_config *cfg;
 
    cfg = get_global_cfg();
    if (!cfg) {
        return DEFAULT_NOREFERSUB;
    }
 
    norefersub = cfg->norefersub;
    ao2_ref(cfg, -1);
    return norefersub;
}
 
static int overload_trigger_handler(const struct aco_option *opt,
    struct ast_variable *var, void *obj)
{
    struct global_config *cfg = obj;
    if (!strcasecmp(var->value, "none")) {
        cfg->overload_trigger = TASKPROCESSOR_OVERLOAD_TRIGGER_NONE;
    } else if (!strcasecmp(var->value, "global")) {
        cfg->overload_trigger = TASKPROCESSOR_OVERLOAD_TRIGGER_GLOBAL;
    } else if (!strcasecmp(var->value, "pjsip_only")) {
        cfg->overload_trigger = TASKPROCESSOR_OVERLOAD_TRIGGER_PJSIP_ONLY;
    } else {
        ast_log(LOG_WARNING, "Unknown overload trigger '%s' specified for %s\n",
                var->value, var->name);
        return -1;
    }
    return 0;
}
 
static const char *overload_trigger_map[] = {
    [TASKPROCESSOR_OVERLOAD_TRIGGER_NONE] = "none",
    [TASKPROCESSOR_OVERLOAD_TRIGGER_GLOBAL] = "global",
    [TASKPROCESSOR_OVERLOAD_TRIGGER_PJSIP_ONLY] = "pjsip_only"
};
 
const char *ast_sip_overload_trigger_to_str(enum ast_sip_taskprocessor_overload_trigger trigger)
{
    return ARRAY_IN_BOUNDS(trigger, overload_trigger_map) ?
        overload_trigger_map[trigger] : "";
}
 
static int overload_trigger_to_str(const void *obj, const intptr_t *args, char **buf)
{
    const struct global_config *cfg = obj;
    *buf = ast_strdup(ast_sip_overload_trigger_to_str(cfg->overload_trigger));
    return 0;
}
 
/*!
 * \internal
 * \brief Observer to set default global object if none exist.
 *
 * \param name Module name owning the sorcery instance.
 * \param sorcery Instance being observed.
 * \param object_type Name of object being observed.
 * \param reloaded Non-zero if the object is being reloaded.
 */
static void global_loaded_observer(const char *name, const struct ast_sorcery *sorcery, const char *object_type, int reloaded)
{
    struct ao2_container *globals;
    struct global_config *cfg;
 
    if (strcmp(object_type, "global")) {
        /* Not interested */
        return;
    }
 
    globals = ast_sorcery_retrieve_by_fields(sorcery, "global",
        AST_RETRIEVE_FLAG_MULTIPLE | AST_RETRIEVE_FLAG_ALL, NULL);
    if (globals) {
        int count;
 
        count = ao2_container_count(globals);
        ao2_ref(globals, -1);
 
        if (1 < count) {
            ast_log(LOG_ERROR,
                "At most one pjsip.conf type=global object can be defined.  You have %d defined.\n",
                count);
            return;
        }
        if (count) {
            return;
        }
    }
 
    ast_debug(1, "No pjsip.conf type=global object exists so applying defaults.\n");
    cfg = ast_sorcery_alloc(sorcery, "global", NULL);
    if (!cfg) {
        return;
    }
    global_apply(sorcery, cfg);
    ao2_ref(cfg, -1);
}
 
static const struct ast_sorcery_instance_observer observer_callbacks_global = {
    .object_type_loaded = global_loaded_observer,
};
 
int sip_cli_print_global(struct ast_sip_cli_context *context)
{
    struct global_config *cfg = get_global_cfg();
 
    if (!cfg) {
        cfg = ast_sorcery_alloc(ast_sip_get_sorcery(), "global", NULL);
        if (!cfg) {
            return -1;
        }
    }
 
    ast_str_append(&context->output_buffer, 0, "\nGlobal Settings:\n\n");
    ast_sip_cli_print_sorcery_objectset(cfg, context, 0);
 
    ao2_ref(cfg, -1);
    return 0;
}
 
int ast_sip_destroy_sorcery_global(void)
{
    struct ast_sorcery *sorcery = ast_sip_get_sorcery();
 
    ast_sorcery_instance_observer_remove(sorcery, &observer_callbacks_global);
 
    if (previous_regcontext) {
        ast_context_destroy_by_name(previous_regcontext, "PJSIP");
        ast_free(previous_regcontext);
    }
 
    ao2_t_global_obj_release(global_cfg, "Module is unloading");
 
    return 0;
}
 
 
int ast_sip_initialize_sorcery_global(void)
{
    struct ast_sorcery *sorcery = ast_sip_get_sorcery();
 
    snprintf(default_useragent, sizeof(default_useragent), "%s %s",
        DEFAULT_USERAGENT_PREFIX, ast_get_version());
 
    ast_sorcery_apply_default(sorcery, "global", "config", "pjsip.conf,criteria=type=global,single_object=yes,explicit_name=global");
 
    if (ast_sorcery_object_register(sorcery, "global", global_alloc, NULL, global_apply)) {
        return -1;
    }
 
    ast_sorcery_object_field_register(sorcery, "global", "type", "", OPT_NOOP_T, 0, 0);
    ast_sorcery_object_field_register(sorcery, "global", "max_forwards",
        __stringify(DEFAULT_MAX_FORWARDS),
        OPT_UINT_T, 0, FLDSET(struct global_config, max_forwards));
    ast_sorcery_object_field_register(sorcery, "global", "user_agent", default_useragent,
        OPT_STRINGFIELD_T, 0, STRFLDSET(struct global_config, useragent));
    ast_sorcery_object_field_register(sorcery, "global", "default_outbound_endpoint",
        DEFAULT_OUTBOUND_ENDPOINT,
        OPT_STRINGFIELD_T, 0, STRFLDSET(struct global_config, default_outbound_endpoint));
    ast_sorcery_object_field_register(sorcery, "global", "debug", DEFAULT_DEBUG,
        OPT_STRINGFIELD_T, 0, STRFLDSET(struct global_config, debug));
    ast_sorcery_object_field_register(sorcery, "global", "endpoint_identifier_order",
        DEFAULT_ENDPOINT_IDENTIFIER_ORDER,
        OPT_STRINGFIELD_T, 0, STRFLDSET(struct global_config, endpoint_identifier_order));
    ast_sorcery_object_field_register(sorcery, "global", "keep_alive_interval",
        __stringify(DEFAULT_KEEPALIVE_INTERVAL),
        OPT_UINT_T, 0, FLDSET(struct global_config, keep_alive_interval));
    ast_sorcery_object_field_register(sorcery, "global", "max_initial_qualify_time",
        __stringify(DEFAULT_MAX_INITIAL_QUALIFY_TIME),
        OPT_UINT_T, 0, FLDSET(struct global_config, max_initial_qualify_time));
    ast_sorcery_object_field_register(sorcery, "global", "default_from_user", DEFAULT_FROM_USER,
        OPT_STRINGFIELD_T, 0, STRFLDSET(struct global_config, default_from_user));
    ast_sorcery_object_field_register(sorcery, "global", "default_voicemail_extension",
        DEFAULT_VOICEMAIL_EXTENSION, OPT_STRINGFIELD_T, 0, STRFLDSET(struct global_config,
        default_voicemail_extension));
    ast_sorcery_object_field_register(sorcery, "global", "regcontext", DEFAULT_REGCONTEXT,
        OPT_STRINGFIELD_T, 0, STRFLDSET(struct global_config, regcontext));
    ast_sorcery_object_field_register(sorcery, "global", "contact_expiration_check_interval",
        __stringify(DEFAULT_CONTACT_EXPIRATION_CHECK_INTERVAL),
        OPT_UINT_T, 0, FLDSET(struct global_config, contact_expiration_check_interval));
    ast_sorcery_object_field_register(sorcery, "global", "disable_multi_domain",
        DEFAULT_DISABLE_MULTI_DOMAIN ? "yes" : "no",
        OPT_BOOL_T, 1, FLDSET(struct global_config, disable_multi_domain));
    ast_sorcery_object_field_register(sorcery, "global", "unidentified_request_count",
        __stringify(DEFAULT_UNIDENTIFIED_REQUEST_COUNT),
        OPT_UINT_T, 0, FLDSET(struct global_config, unidentified_request_count));
    ast_sorcery_object_field_register(sorcery, "global", "unidentified_request_period",
        __stringify(DEFAULT_UNIDENTIFIED_REQUEST_PERIOD),
        OPT_UINT_T, 0, FLDSET(struct global_config, unidentified_request_period));
    ast_sorcery_object_field_register(sorcery, "global", "unidentified_request_prune_interval",
        __stringify(DEFAULT_UNIDENTIFIED_REQUEST_PRUNE_INTERVAL),
        OPT_UINT_T, 0, FLDSET(struct global_config, unidentified_request_prune_interval));
    ast_sorcery_object_field_register(sorcery, "global", "default_realm", DEFAULT_REALM,
        OPT_STRINGFIELD_T, 0, STRFLDSET(struct global_config, default_realm));
    ast_sorcery_object_field_register(sorcery, "global", "mwi_tps_queue_high",
        __stringify(DEFAULT_MWI_TPS_QUEUE_HIGH),
        OPT_UINT_T, 0, FLDSET(struct global_config, mwi.tps_queue_high));
    ast_sorcery_object_field_register(sorcery, "global", "mwi_tps_queue_low",
        __stringify(DEFAULT_MWI_TPS_QUEUE_LOW),
        OPT_INT_T, 0, FLDSET(struct global_config, mwi.tps_queue_low));
    ast_sorcery_object_field_register(sorcery, "global", "mwi_disable_initial_unsolicited",
        DEFAULT_MWI_DISABLE_INITIAL_UNSOLICITED ? "yes" : "no",
        OPT_BOOL_T, 1, FLDSET(struct global_config, mwi.disable_initial_unsolicited));
    ast_sorcery_object_field_register(sorcery, "global", "allow_sending_180_after_183",
        DEFAULT_ALLOW_SENDING_180_AFTER_183 ? "yes" : "no",
        OPT_BOOL_T, 1, FLDSET(struct global_config, allow_sending_180_after_183));
    ast_sorcery_object_field_register(sorcery, "global", "ignore_uri_user_options",
        DEFAULT_IGNORE_URI_USER_OPTIONS ? "yes" : "no",
        OPT_BOOL_T, 1, FLDSET(struct global_config, ignore_uri_user_options));
    ast_sorcery_object_field_register(sorcery, "global", "use_callerid_contact",
        DEFAULT_USE_CALLERID_CONTACT ? "yes" : "no",
        OPT_YESNO_T, 1, FLDSET(struct global_config, use_callerid_contact));
    ast_sorcery_object_field_register(sorcery, "global", "send_contact_status_on_update_registration",
        DEFAULT_SEND_CONTACT_STATUS_ON_UPDATE_REGISTRATION ? "yes" : "no",
        OPT_YESNO_T, 1, FLDSET(struct global_config, send_contact_status_on_update_registration));
    ast_sorcery_object_field_register_custom(sorcery, "global", "taskprocessor_overload_trigger",
        overload_trigger_map[DEFAULT_TASKPROCESSOR_OVERLOAD_TRIGGER],
        overload_trigger_handler, overload_trigger_to_str, NULL, 0, 0);
    ast_sorcery_object_field_register(sorcery, "global", "norefersub",
        DEFAULT_NOREFERSUB ? "yes" : "no",
        OPT_YESNO_T, 1, FLDSET(struct global_config, norefersub));
 
    if (ast_sorcery_instance_observer_add(sorcery, &observer_callbacks_global)) {
        return -1;
    }
 
    return 0;
}