opensips - an event-driven sip routing engine - fosdem · 2017-08-21 · liviu chircu - 4th feb...

Liviu Chircu- 4th Feb 2017 -

OpenSIPS - an event-drivenSIP routing engine

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Outline

● Architecture timeline

● Event subscribe-notify

● Usage scenarios

● OpenSIPS scripts

● Conclusions

2

Architecture timeline

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Step 1: “Linear” architecture

OpenSIPS 1.X

4

TimeSIP packet arrivals

Thread 1

Thread 2

CPU bound

I/O bound

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Step 2: “Async” architecture

OpenSIPS 2.1, 2.2

5

TimeSIP packet arrivals

Thread 1

CPU bound

I/O bound

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Limitation: Processing is still linear!

Advanced SIP scenarios:

● Push Notifications● FreeSWITCH ESL Events (e.g. DTMF)● Call Pick-up

What’s missing:

● Communication & data exchange between different processing contexts

6

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Step 3: “Event-driven” architecture

7

TimeSIP packet arrivals

Thread 1

Thread 2

SIP msg A

SIP msg B

wait(event X) resume()

event X

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Step 3: “Event-driven” architecture

8

TimeSIP packet arrival

Thread 1

SIP msg A 4xx SIP replywait(event X) resume()

timeout!

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Step 3: “Event-driven” architecture

9

TimeSIP packet arrivals

Thread 1

Thread 2

SIP msg A

SIP msg B

trigger(handler, eventX)

eventX

handler

Event subscribe/notify

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Event Definition

● Triggered by actions / data processing during runtime● Events hold key/value attributes● OpenSIPS has a list of predefined events

11

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Subscribe

● interested OpenSIPS workers subscribe to events● event subscriptions may contain filtering attributes

12

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Notify

● Notification == event● Events are generated during runtime● They are dispatched to all relevant subscribers● Events are parametrized (e.g. DTMF digit, REG Contact)

13

Usage scenarios

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Push Notifications

15

INVITE bob

1xxPN

REGISTER

INVITE bob

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Push Notifications

Current way

1. incoming call for “bob”

2. send PN to “bob”’s mobile device

3. async sleep (N)

4. call(“bob”) if registered(“bob”) else goto 3.

16

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Push Notifications

Current way (limitations)

1. performance killer

2. inflexible, cannot handle complex scenarios

● parallel forking (desk + mobile devices)● multiple gateways

17

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Push Notifications

In 2.3:

1. incoming call for “bob”

2. subscribe(“REGISTER”, “aor=bob”, “reg_handler”)

3. send PN to “bob”’s mobile device

4. fork calls to existing registrations

...

route [reg_handler] { fork_call(“$event(contact)”); }

18

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

DTMF-based fax/voicemail detection

In 2.3:

1. incoming call for “bob”

2. subscribe(“DTMF”, “callid=$ci”, “dtmf_handler”)

3. send call to “bob”

...

route [dtmf_handler] { hangup() if $event(digit) != 2 }

19

OpenSIPS Script

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Push Notifications

subscribe("REGISTER", "aor=bob", "reg_handler");

route(SEND_APN);

if (lookup("location"))

t_relay();

halt();

21

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Push Notifications

route [SEND_APN] {

rest_append_hf("Authorization: key=CONSOLE_API_KEY");

rest_append_hf("Content-Type: \"application/json\"");

rest_post("https://android.googleapis.com/gcm/send",

"{ \"data\" : {\"foo\": \"bar\"},

\"registration_ids\":[\"REGISTRATION_ID\"] }"...);

}22

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Push Notifications

route [reg_handler] {

route(CHECK_IF_MOBILE, "$event(contact)");

t_relay();

}

23

Conclusions

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

Conclusions

Event-driven approach:

● powerful & easy to use● complex scenarios with simple script● lightning fast!

25

- FOSDEM ‘17 -Liviu Chircu - OpenSIPS Project

OpenSIPS 2.3 - “integration”

● SIP capturing - Homer/SIPCapture● billing - CGRateS● software PBX - FreeSWITCH● middleware - RabbitMQ

26

● Liviu Chircu○ OpenSIPS Project: www.opensips.org○ liviu@opensips.org

Take-Away Message

Under development!