How to get all dialer events from Asterisk REST API (ARI)?
I'm making a web application which should be able to monitor calls on my Asterisk server. I can connect to ARI with Javascript WebSocket on URL ws://(host):8088/ari/events?app=dialer and it works. The problem is that I only get events from calls that are made over ARI. Calls made from other clients like Zoiper are not registered. On the other hand, Asterisk has AJAM which uses long polling on http://(host):8088/rawman?action=waitevent and it registers calls from all the clients, (ARI, Zoiper and others) but there's only information who is calling (caller), not whom (callee).
So, my question is, how can I get real time call events that show who is calling who, from all the clients, (preferably) with WebSockets. Thanks.
Answer
ARI uses a subscription based model for events. Quoting from the documentation on the wiki:
Resources in Asterisk do not, by default, send events about themselves to a connected ARI application. In order to get events about resources, one of three things must occur:
- The resource must be a channel that entered into a Stasis dialplan application. A subscription is implicitly created in this case. The subscription is implicitly destroyed when the channel leaves the Stasis dialplan application.
- While a channel is in a Stasis dialplan application, the channel may interact with other resources - such as a bridge. While channels interact with the resource, a subscription is made to that resource. When no more channels in a Stasis dialplan application are interacting with the resource, the implicit subscription is destroyed.
- At any time, an ARI application may make a subscription to a resource in Asterisk through application operations. While that resource exists, the ARI application owns the subscription.
So, the reason you get events about a channel over your ARI WebSocket is because it went into the Stasis dialplan application. That isn't, however, the only way to get events.
If you're interested in events from other event sources, you can subscribe to those resources using the applications resource. For example, if I wanted to receive all events that were in relation to PJSIP endpoint "Alice", I would subscribe using the following:
POST https://localhost:8080/ari/applications/my_app/subscription?eventSource=endpoint:PJSIP%2FAlice
Note that subscriptions to endpoints implicitly subscribe you to all channels that are created for that endpoint. If you want to subscribe to all endpoints of a particular technology, you can also subscribe to the resource itself:
POST https://localhost:8080/ari/applications/my_app/subscription?eventSource=endpoint:PJSIP