Downloaded 12 times
![route{
$var(a) = 4;
if(ds_select("1", "$var(a)")) {
t_on_failure("handleFailedCalls");
ds_next_domain();
t_relay();
exit;
}
}
failure_route[handleFailedCalls] {
ds_mark_dst("ip");
if(ds_select("1", "$var(a)")) {
ds_next_domain();
t_relay();
exit;
}
}
https://www.kamailio.org/docs/modules/5.1.x/modules/dispatcher.html
kamailio](https://image.slidesharecdn.com/vinzensastricon2018-181011190349/85/astricon2018-17-320.jpg)
![[default]
exten = _X.,1,Stasis(callcontroller)
same = n,Hangup(20)
extensions.conf
asterisk](https://image.slidesharecdn.com/vinzensastricon2018-181011190349/85/astricon2018-18-320.jpg)
![asterisk
ARI
{"type":"StasisStart
","timestamp":"2018-
09-17T14:34:12.576+0
200","args":[],"chan
nel":{"id":"15371876
52.36","name":"PJSIP
/proxy-00000012","..
...
ARI
envelope
Asterisk ID
routing key](https://image.slidesharecdn.com/vinzensastricon2018-181011190349/85/astricon2018-20-320.jpg)
astricon2018
- 1. distributed high available stasisapp Jöran Vinzens @vinzens81 linkedin.com/in/jvinzens/
- 2. ● motivation ● idea ●implementation ● performance ● open source schedule .
- 3.
- 4.
- 5.
- 6. ● two different"roles" for Asterisk servers ○ billing, announcement ○ pbx functionality ● pbx part in cluster with sharding of customers by ID ● up to 4 Asterisk in one call flow ● many perl AGI ● old, fragile FastAGI monolith ● patched Asterisk 11 :-/ current setup .
- 7.
- 8. ● high availability ●performance ● scalability ● continuous deployment ● no untested code ● low barrier to entry ● resilience demands .
- 9.
- 10. complete re-build Asterisk 15/16with ARI decision .
- 11.
- 12. today ● AGI /AMI ● evolved monolith ● complex call routing tomorrow ● ARI ● modular system ● one Asterisk change .
- 13.
- 14. kamailio dispatcher module - dispatchcalls - observe Asterisk - re-routing on failure Asterisk Stasis app / media - determine Stasis app - handle all SIP/media - carrier handling callcontroller call logic - PBX function - routing logic - back-end requests idea .
- 15. how does itwork?
- 16. SIP REST ARIover Kafka
- 17. route{ $var(a) = 4; if(ds_select("1","$var(a)")) { t_on_failure("handleFailedCalls"); ds_next_domain(); t_relay(); exit; } } failure_route[handleFailedCalls] { ds_mark_dst("ip"); if(ds_select("1", "$var(a)")) { ds_next_domain(); t_relay(); exit; } } https://www.kamailio.org/docs/modules/5.1.x/modules/dispatcher.html kamailio
- 18. [default] exten = _X.,1,Stasis(callcontroller) same= n,Hangup(20) extensions.conf asterisk
- 19.
- 20.
- 21.
- 22. ARI events ->kafka event envelope ARI commands <- kafka command envelope asterisk ARI over kafka ● one ARI-Proxy for each stasis app/asterisk
- 23. asterisk ARI over kafka ●multiple ARI Proxy on different stasis apps for each Asterisk
- 24. asterisk ARI over kafka ●one combined Kafka topic for each type of stasis app on all Asterisks (Events) ● one separate Kafka topic for each stasis app/Asterisk (Commands)
- 25.
- 26.
- 27.
- 28. ● all eventsof one call to the same call-controller ● reply to the sender asterisk kafka routing
- 29. StasisStart - generate routingkey (UUID) - save channel ID -> routing key asterisk kafka routing
- 30. ChannelStateChange get routing keywith channel ID asterisk kafka routing
- 31. - get routingkey on channel ID - save routing key -> playback ID - get routing key on playback ID asterisk kafka routing playbackStarted command: channel/playback
- 32. ● one routingkey for an entire call "callcontext" ● all commands generating new resources will update the key map ● only StasisStart event will generate key if absent still todo: ● generate channel out of nothing not finished asterisk kafka routing
- 33. goal ● transparent Asteriskserver farm ● use ARI documentation for development ● restart-safe ● easy to scale not finished callcontroller
- 34. architecture ● akka ● actorsystem ● akka finite state machine (FSM) for "call application" not finished callcontroller
- 35.
- 36. callcontroller routing to correctapp - different apps doing different call types - each call generates new instance
- 37. callcontroller commands topic istaken from ARI envelope .
- 38. load capacity &timing
- 39. ● all measurementstaken without load ● time from event "Stasis Start" / "Invite" to command "answer" / "200 OK" ● median value taken ● basic call to an announcement timing
- 40. 9 ms ARI overkafkaSIP REST
- 41. 11 ms +2 ms ARIover kafkaSIP REST
- 42. 33 ms +22ms ARI overkafkaSIP REST
- 43. 54 ms +21 ms ARIover kafkaSIP REST
- 44. 67 ms +13 ms ARIover kafkaSIP REST
- 45. 202 ms +135 ms ARIover kafkaSIP REST
- 46. 2 ms SIP Invite-> ARI StasisStart ARI over kafkaSIP REST
- 47. 133 ms SIP 200OK <- rest Command answer ARI over kafkaSIP REST
- 48.
- 49. ● produce loadwith sipp locally on the Asterisk ● increase load until the system breaks ● basic call to announcement ● 13 events for each call ● 7 commands / reply for each call ● 30 sec call duration with RTP each call -> answer, playback, recording, playback, playback, hangup, delete file load capacity
- 50. ● 2 hardwaremachines running Asterisk / ARI-Proxy ● 3 VM running kafka ● 2 VM running callcontroller ● 1 VM running redis load capacity
- 51. ● test run1 ○ high load over long time to find memory leaks ● test run 2 ○ increased load until PDD increased/something crash load capacity
- 52. test run 1 eachAsterisk - 4 cps - ~15h run - 213k calls - 0.0141% failure load capacity
- 53. test run 1 loadcapacity
- 54. test run 2 loadcapacity
- 55. test run 2 loadcapacity
- 56. test run 2 -limit at 4.8 cps - limit due to single-threaded java load capacity .
- 57.
- 58. ● high availability ●performance ● scalability ● continuous deployment ● no untested code ● low barrier to entry ● resilience fitting the demands .
- 59.
- 60. https://retel.io reasons ● clean codewithout "sipgate" stuff ● giving back to the community opensource .
- 61.
- 62. connectors - go ARIProxy -> github.com/CyCoreSystems/ari-proxy -> NATS - go ARI Proxy -> github.com/nvisibleinc/go-ari-proxy -> RabbitMQ, NATS - AsterNET -> github.com/skrusty/AsterNET-ARI-Proxy -> RabbitMQ alternatives
- 63. library - go ->github.com/CyCoreSystems/ari - phpari -> github.com/greenfieldtech-nirs/phpari - python -> github.com/asterisk/ari-py - node -> github.com/asterisk/node-ari-client - ruby -> github.com/svoboda-jan/asterisk-ari (> 2y no commit) ...any many more... alternatives .
- 64.