how to: setup openser high availability on debian

# ----------- global configuration parameters ------------------------

debug=4 # debug level (cmd line: -dddddddddd)
fork=no # daemonize
log_stderror=yes # (cmd line: -E)

check_via=no # (cmd. line: -v)
dns=no # (cmd. line: -r)
rev_dns=no # (cmd. line: -R)
children=4
fifo="/tmp/openser_fifo"

listen=udp:10.1.10.31:5060

#
# ------------------ module loading ----------------------------------

# Uncomment this if you want to use SQL database
mpath="/usr/local/lib/openser/modules"
loadmodule "/usr/lib/openser/modules/mysql.so"

loadmodule "/usr/lib/openser/modules/xlog.so"
loadmodule "/usr/lib/openser/modules/sl.so"
loadmodule "/usr/lib/openser/modules/tm.so"
loadmodule "/usr/lib/openser/modules/rr.so"
loadmodule "/usr/lib/openser/modules/maxfwd.so"
loadmodule "/usr/lib/openser/modules/usrloc.so"
loadmodule "/usr/lib/openser/modules/registrar.so"
loadmodule "/usr/lib/openser/modules/textops.so"
loadmodule "/usr/lib/openser/modules/avpops.so"
loadmodule "/usr/lib/openser/modules/auth.so"
loadmodule "/usr/lib/openser/modules/auth_db.so"
loadmodule "/usr/lib/openser/modules/group.so"
loadmodule "/usr/lib/openser/modules/uri.so"
loadmodule
# ----------------- setting module-specific parameters ---------------
modparam("usrloc|auth_db|avpops|group",
"db_url", "mysql://username:password@10.1.10.31/openser")

# -- usrloc params --
# persistent storage
modparam("usrloc", "db_mode", 2)

# -- auth params --
# Uncomment if you are using auth module
#
modparam("auth_db", "calculate_ha1", yes)
#
# If you set "calculate_ha1" parameter to yes (which true in this config),
# uncomment also the following parameter)
#
modparam("auth_db", "password_column", "password")

# -- rr params --
# add value to ;lr param to make some broken UAs happy
modparam("rr", "enable_full_lr", 1)

modparam("avpops", "avp_table", "usr_preferences")

modparam("presence", "db_url", "mysql://username:password@10.1.10.31/openser")
modparam("presence", "presentity_table", "presentity")
modparam("presence", "active_watchers_table", "active_watchers")
modparam("presence", "watchers_table", "watchers")
modparam("presence", "xcap_table", "xcaps")
modparam("presence", "clean_period", 100)
modparam("presence", "to_tag_pref", 'a')
modparam("presence", "lock_set_size", 8)
modparam("presence", "expires_offset", 10)
modparam("presence", "max_expires", 3600)

# ------------------------- request routing logic -------------------

# main routing logic

route{

# initial sanity checks -- messages with
# max_forwards==0, or excessively long requests
if (!mf_process_maxfwd_header("10")) {
sl_send_reply("483","Too Many Hops");
exit;
};

if (msg:len >= 2048 ) {
sl_send_reply("513", "Message too big");
exit;
};

# we record-route all messages -- to make sure that
# subsequent messages will go through our proxy; that's
# particularly good if upstream and downstream entities
# use different transport protocol
if (!method=="REGISTER")
record_route();

# subsequent messages withing a dialog should take the
# path determined by record-routing
if (loose_route()) {
# mark routing logic in request
append_hf("P-hint: rr-enforced\r\n");
route(1);
};
if (!uri==myself) {
# mark routing logic in request
append_hf("P-hint: outbound\r\n");
route(1);
};

# if the request is for other domain use UsrLoc
# (in case, it does not work, use the following command
# with proper names and addresses in it)
if (uri==myself) {

if (method=="REGISTER") {
if (!www_authorize("yourdomain.com", "subscriber")) {
www_challenge("yourdomain.com", "0");
exit;
};

save("location");
exit;
};

# requests for Media server
if(is_method("INVITE") && !has_totag() && uri=~"sip:\*9") {
route(3);
exit;
}

# requests for Media server
if(is_method("INVITE") && !has_totag() && uri=~"sip:1[0-9]{10}@.*") {
route(4);
exit;
}

# mark transaction if user is in voicemail group
if(is_method("INVITE") && !has_totag()
&& is_user_in("Request-URI","voicemail"))
{
xdbg("user [$ru] has voicemail redirection enabled\n");
# backup R-URI
avp_write("$ruri", "$avp(i:10)");
#$avp(s:inv_timeout);

setflag(2);
};
# native SIP destinations are handled using our USRLOC DB
if (!lookup("location")) {
if(isflagset(2)) {
# route to Asterisk Media Server
prefix("1");
#rewritehostport("10.1.10.30:5060");
route(1);
} else {
sl_send_reply("404", "Not Found");
exit;
}
};
append_hf("P-hint: usrloc applied\r\n");
};

route(1);
}

route[1] {

if(isflagset(2))
t_on_failure("1");

if (!t_relay()) {
sl_reply_error();
};
exit;
}

# voicemail access
# - *98 - listen caller's voice messages, being prompted for pin
# - *981 - listen voice messages, being promted for mailbox and pin
# - *98XXXX - leave voice message to XXXX
#
route[3] {
# direct voicemail
if (uri =~ "sip:\*98@" ) {
#rewriteuser("1");
xdbg("voicemail access\n");
} else if (uri =~ "sip:\*981@" ) {
strip(4);
#rewriteuser("11");
} else if (uri =~ "sip:\*98.+@" ) {
strip(3);
prefix("1");
} else {
xlog("unknown media extension $rU\n");
sl_send_reply("404", "Unknown media service");
exit;
}

# route to Asterisk Media Server
rewritehostport("10.1.10.30:5060");
route(1);
}

route[4] {
# direct voicemail
if (uri =~ "sip:1[0-9]{10}@.*" ) {
xdbg("making a call\n");
} else if (uri =~ "sip:[0-9]{3}@.*" ) {
xdbg("internal call\n");

} else if (uri =~ "sip:\*98.+@" ) {
strip(3);
prefix("1");
} else {
xlog("unknown media extension $rU\n");
sl_send_reply("404", "Unknown media service");
exit;
}

# route to Asterisk Media Server
rewritehostport("10.1.10.30:5060");
route(1);
}

failure_route[1] {
if (t_was_cancelled()) {
xdbg("transaction was cancelled by UAC\n");
return;
}
# restore initial uri
avp_pushto("$ruri", "$avp(i:10)");
prefix("1");
# route to Asterisk Media Server
rewritehostport("10.1.10.30:5060");
resetflag(2);
route(1);
}