res_pjsip_mwi: Add voicemail extension and mwi_subscribe_replaces_unsolicited

res_pjsip_mwi was missing the chan_sip "vmexten" functionality which adds
the Message-Account header to the MWI NOTIFY.  Also, specifying mailboxes
on endpoints for unsolicited mwi and on aors for subscriptions required
that the admin know in advance which the client wanted.  If you specified
mailboxes on the endpoint, subscriptions were rejected even if you also
specified mailboxes on the aor.

Voicemail extension:
* Added a global default_voicemail_extension which defaults to "".
* Added voicemail_extension to both endpoint and aor.
* Added ast_sip_subscription_get_dialog for support.
* Added ast_sip_subscription_get_sip_uri for support.

When an unsolicited NOTIFY is constructed, the From header is parsed, the
voicemail extension from the endpoint is substituted for the user, and the
result placed in the Message-Account field in the body.

When a subscribed NOTIFY is constructed, the subscription dialog local uri
is parsed, the voicemail_extension from the aor (looked up from the
subscription resource name) is substituted for the user, and the result
placed in the Message-Account field in the body.

If no voicemail extension was defined, the Message-Account field is not added
to the NOTIFY body.

mwi_subscribe_replaces_unsolicited:
* Added mwi_subscribe_replaces_unsolicited to endpoint.

The previous behavior was to reject a subscribe if a previous internal
subscription for unsolicited MWI was found for the mailbox.  That remains the
default.  However, if there are mailboxes also set on the aor and the client
subscribes and mwi_subscribe_replaces_unsolicited is set, the existing internal
subscription is removed and replaced with the external subscription.  This
allows an admin to configure mailboxes on both the endpoint and aor and allows
the client to select which to use.

ASTERISK-25865 #close
Reported-by: Ross Beer

Change-Id: Ic15a9415091760539c7134a5ba3dc4a6a1217cea

1 files changed, 20 insertions, 0 deletions

diff --git a/res/res_pjsip/location.c b/res/res_pjsip/location.c
index 4284f35f1..735b18f46 100644
--- a/res/res_pjsip/location.c
+++ b/res/res_pjsip/location.c
@@ -35,6 +35,7 @@ static void aor_destroy(void *obj)
 
 	ao2_cleanup(aor->permanent_contacts);
 	ast_string_field_free_memory(aor);
+	ast_free(aor->voicemail_extension);
 }
 
 /*! \brief Allocator for AOR */
@@ -442,6 +443,24 @@ static int contacts_to_var_list(const void *obj, struct ast_variable **fields)
 	return 0;
 }
 
+static int voicemail_extension_handler(const struct aco_option *opt, struct ast_variable *var, void *obj)
+{
+	struct ast_sip_aor *aor = obj;
+
+	aor->voicemail_extension = ast_strdup(var->value);
+
+	return aor->voicemail_extension ? 0 : -1;
+}
+
+static int voicemail_extension_to_str(const void *obj, const intptr_t *args, char **buf)
+{
+	const struct ast_sip_aor *aor = obj;
+
+	*buf = ast_strdup(aor->voicemail_extension);
+
+	return 0;
+}
+
 int ast_sip_for_each_aor(const char *aors, ao2_callback_fn on_aor, void *arg)
 {
 	char *copy, *name;
@@ -992,6 +1011,7 @@ int ast_sip_initialize_sorcery_location(void)
 	ast_sorcery_object_field_register(sorcery, "aor", "remove_existing", "no", OPT_BOOL_T, 1, FLDSET(struct ast_sip_aor, remove_existing));
 	ast_sorcery_object_field_register_custom(sorcery, "aor", "contact", "", permanent_uri_handler, contacts_to_str, contacts_to_var_list, 0, 0);
 	ast_sorcery_object_field_register(sorcery, "aor", "mailboxes", "", OPT_STRINGFIELD_T, 0, STRFLDSET(struct ast_sip_aor, mailboxes));
+	ast_sorcery_object_field_register_custom(sorcery, "aor", "voicemail_extension", "", voicemail_extension_handler, voicemail_extension_to_str, NULL, 0, 0);
 	ast_sorcery_object_field_register(sorcery, "aor", "outbound_proxy", "", OPT_STRINGFIELD_T, 0, STRFLDSET(struct ast_sip_aor, outbound_proxy));
 	ast_sorcery_object_field_register(sorcery, "aor", "support_path", "no", OPT_BOOL_T, 1, FLDSET(struct ast_sip_aor, support_path));