This document summarizes an experiment with Asterisk SCF (Scalable Call Framework) using the Groovy programming language. It demonstrates dynamic configuration of SIP endpoints using Groovy code. This shows SCF's extensibility and ability to support modern languages like Groovy. The experiment proved SCF's potential for dynamic configuration, cloud-friendly operation, and JVM language support - making it ready for future telephony capabilities like webRTC. While still a work in progress, the fundamentals and future-proofing of SCF were shown to be sound.

2. Asterisk SCF
A developer’s view
Tim Panton - PhoneFromHere.com
twitter.com/steely_glint

3. Asterisk SCF recap
• Scalability
• Fault tolerant
• Extensible
• Performance

4. Developer Ecosystem
• Tip of the hat to Digium Inc
• Developers involved throughout
• Requirements from ecosystem
• Open development process

5. What I wanted
• Extensibility
• Modern Language support
• Dynamic
• Cloud friendly

6. The Experiment
• Git snapshot of current code
• Not a release !
• Not a routing engine
• Help from asterisk-scf-dev IRC
• Used Groovy (via JVM)

7. Live code demo
• Code at github
• https://github.com/steely-glint/ascf-groovy-
demo

8. Auto
generated
Static code un-demo
java classes
Initialize
import AsteriskSCF.Configuration.SipSessionManager.V1.*; ICE RPC
import AsteriskSCF.Core.Discovery.V1.*; protocol
import AsteriskSCF.System.Configuration.V1.*;
Connect to
Ser viceLocator
Ser vice ic = Ice.Util.initialize(null);
sloc = ServiceLocatorPrxHelper.checkedCast(ic.stringToProxy("LocatorService:tcp -p 4411")); List all
services = Arrays.asList(sloc.locateAll(new SipConfigurationParams())); ser vices
sipconf = services.findAll { item -> ConfigurationServicePrxHelper.checkedCast(item) != null}
Find the SIP sc = ConfigurationServicePrxHelper.checkedCast(sipconf[0]);
Session cgrps = [ Pick the first
Manager(s) { g = new SipGeneralGroup(); g.configurationItems = [:] ; return g} , one
{ u = new SipUDPTransportGroup();
u.name = "h-udp";
u.configurationItems = [ "host" : new SipHostItem(1,"127.0.0.1",5081)];
Define a return u},
couple of local { u = new SipUDPTransportGroup(); Convert to
u.name = "h-udp1"; ICE friendly
endpoints
u.configurationItems = [ "host" : new SipHostItem(2,"127.0.0.1",5080)]; format
return u}];
grps = cgrps.collect{item -> item.call()}
sc.setConfiguration((ConfigurationGroup[])grps.toArray()); Send the
request to
ASCF

9. What have I proved ?
• Dynamic configuration
• Cloud friendly
• JVM language support (java, scala, javascript)
• Components independently managable

10. Voice 3.0 ready
• Adornment
• Session Cookies
• webRTC
• Hooks

11. Conclusions
• Still a work in progress
• Much to be done
• Much to be documented
• Fundamentals are right
• Future-proofing is in place

12. Thanks
• Comments or questions @steely_glint
• My blog at babyis60.wordpress.com