Monitoring VoIP Systems. Sebastian Damm

Transcription

1 Monitoring VoIP Systems Sebastian Damm

2 Who we are, what we do Düsseldorf based VoIP provider (since 2004) active in Germany and UK Private and Business customers VoIP and Mobile products some 100k users almost 100 million minutes each month

3 VoIP systems monitored Asterisk (~100 servers) Kamailio (12 servers) Yate (12 servers) RTP Proxy (12 servers) ASR (

4 Our Monitoring systems 2 Icinga servers almost 1k hosts more than 5k services Cacti Observium for network monitoring

5 Monitoring SIP simple Perl script UDP capable (TCP and TLS coming soon) resolves SRV DNS records, checks all targets Watch the response code! different systems answer differently

6 Monitoring Asterisk Base monitoring (disk, memory, load) SIP Remote Manager Asterisk Version, Config version, G729 status, Channels, Uptime Open Files (SNMP extension) IPtables status (SNMP extension)

7 Monitoring Asterisk

8 check_manager.pl first we called it separately for each service high load on the monitoring system now: one script fills all services only the MANAGER service is active, all others are passive (with fallback command) can be called as active check for each service

9 check_manager.pl sub push_passive { my ($service,$state,$msg) my $timestamp = time; eval { open CMD, ">>", $cmdfile or die $!; }; if ($@) { print "Could not open Command file!\n" if (defined($opts_verbose)); return; } my $cmdmsg = sprintf("[%s] PROCESS_SERVICE_CHECK_RESULT;%s;%s;%s;%s\n", $timestamp,$opts_host,$service,$errors{$state},$msg); print $cmdmsg if (defined($opts_verbose)); print CMD $cmdmsg; } close CMD;

10 Integrating into Icinga Service Definition Active Check define service { service_description hostgroup_name use check_command } MANAGER sipgw local-service check_manager Passive Check define service { service_description AST_UPTIME hostgroup_name sipgw use local-service check_command check_manager_active!uptime is_volatile 1 active_checks_enabled 0 passive_checks_enabled 1 check_freshness 1 max_check_attempts 1 freshness_threshold 600 }

11 Integrating into Icinga Command Definition Active Check Passive Check (Fallback) define command{ command_name check_manager command_line $USER32$/check_manager \ -H $HOSTNAME$ -I $HOSTADDRESS$ \ -u $USER7$ -p $USER8$ \ -m :11211 \ -s SIPCHAN --g729 } define command{ command_name check_manager_active command_line $USER32$/check_manager \ -H $HOSTNAME$ -I $HOSTADDRESS$ \ -u $USER7$ -p $USER8$ \ -m :11211 \ -a $ARG1$ }

12 Check Open Files consists of two scripts on the monitored system one script run by cron every minute other script triggered by SNMPd to read those files

13 Monitoring Kamailio SIP some variables through XMLRPC calls Memory TCP Connections Version

14 Monitoring Kamailio

15 XMLRPC in Kamailio 1. Load the module loadmodule "xmlrpc.so" modparam("xmlrpc", "route", "XMLRPC") 2. Handle XMLRPC calls route["xmlrpc"] { if(src_ip == ) { # only answer to Monitoring set_reply_no_connect(); # optional dispatch_rpc(); } else { xmlrpc_reply("403", "Forbidden"); } }

16 Querying Kamailio sub call_rpc { my ($method,@rpc_params) my (%r,$k); my($rpc_call) = XMLRPC::Lite -> proxy(" -> my $res= $rpc_call->result; } if (!defined $res){ print "Error querying Kamailio\n"; $res=$rpc_call->fault; %r=%{$res}; foreach $k (sort keys %r) { print("\t$k: $r{$k}\n"); } exit $ERRORS{'UNKNOWN'}; } else { return($res); }

17 Monitoring Yate SIP everything else through SNMP SIGTRAN links (beware: element order can change!) Uptime Version Channels

18 Monitoring Yate

19 Monitoring ASR percentage of answered calls / total calls additionally: length of answered calls per Gateway, Carrier, Destination, Product in Yate: configurable and readable via SNMP

20 Monitoring the rest SIP connectivity to partners Function tests (emergency calls, features) ENUM User Location RTP Proxies STUN iptables Connection Tracking

21 That s it Downloads available at: And: We hire, too!

22 Thank you!