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--- kamailio:k43-async-sip-routing-nodejs [2015/09/07 10:21] – [Kamailio Config File] admin
+++ kamailio:k43-async-sip-routing-nodejs [2015/09/07 11:36] (current) – [Async SIP Routing with Kamailio and Node.js] admin
@@ Line 1: / Line 1: @@
 ====== Async SIP Routing with Kamailio and Node.js ======
-**Work in progress -- the tutorial is not complete yet**
+Node.js-based external routing decision engine for Kamailio.
 ===== Overview =====
@@ Line 9: / Line 9: @@
 The [[http://kamailio.org/docs/modules/stable/modules/rtjson.html|module rtjson]] defines a format for JSON document that makes it straightforward to push new destinations for a SIP request. The [[http://kamailio.org/docs/modules/stable/modules/jansson.html|module jansson]] is used to parse the JSON document in kamailio.cfg for fetching additional attributes that are relevant for processing.
+{{ :kamailio:kamailio-evapi-rtjson-nodejs.png?400 |}}
 ===== SIP Routing =====
@@ Line 22: / Line 23: @@
 The tutorial here is aiming to offer a basic example, which should help building more complex external applications for deciding the SIP routing to be performed by Kamailio.
+==== RTJSON Routing Document ====
+The structure for RTJSON routing document is detailed at:
+  * [[http://kamailio.org/docs/modules/stable/modules/rtjson.html#rtjson.json-routing-structure|RTJSON Readme - Document Structure]]
+Next is a partial example, with the attributes for one destination:
+<code javascript>
+{
+ "version": "1.0",
+ "routing": "serial",
+ "routes":
+  [
+   {
+     "uri": "sip:127.0.0.1:5080",
+     "dst_uri": "sip:127.0.0.1:5082",
+     "path": "<sip:127.0.0.1:5084>, <sip:127.0.0.1:5086>",
+     "socket": "udp:127.0.0.1:5060",
+     "headers": {
+       "from": {
+         "display": "Alice",
+         "uri": "sip:alice@wonderland.com"
+       },
+       "to": {
+         "display": "Bob",
+         "uri": "sip:bob@wonderland.com"
+       },
+       "extra": "X-Hdr-A: abc\r\nX-Hdr-B: bcd\r\n"
+     },
+     "branch_flags": 8,
+     "fr_timer": 5000,
+     "fr_inv_timer": 30000
+   },
+...
+  ]
+}
+</code>
+The **routing** field specify if Kamailio has to do serial or parallel forking. After that, the relevant routing information is an array of destinations stored in **routes** field.
+Each destination corresponds to a SIP branch that is going to be created by Kamailio. For each branch can be specified values to set:
+  * request uri
+  * outbound proxy address (dst uri)
+  * display name and uri for From/To headers
+  * extra headers
+  * retransmission and ringing timeouts
+  * local socket or the path to be followed
+  * branch flags
+The example above results in: the request will be routed to sip:127.0.0.1:5080, via sip:127.0.0.1:5082, sip:127.0.0.1:5084, sip:127.0.0.1:5086; it will be sent using local socket udp:127.0.0.1:5060; From header display name will be set to **Alice** and From URI to **sip:alice@wonderland.com**; To header display name will be set to **Bob** and To URI to **sip:alice@wonderland.com**; branch flags will be updated with 8; retransmission will be done for 5000 milliseconds, waiting 30000 milliseconds while ringing.
+==== EVAPI Processing ====
+EVAPI is sort of generic framework to push events to external application from inside kamailio.cfg via TCP connections. It has the capability of suspending the processing of the SIP request until there is a response from the external application. By suspending the SIP request, other SIP messages can be processes, thus not blocking Kamailio while waiting for event response. This asynchronous mechanism enables high throughput for SIP routing.
 ===== Presentations =====
@@ Line 885: / Line 942: @@
   * http://nodejs.org
-A simple sample application is shown next:
+A simple sample application is shown next example. It connects to Kamailio's EVAPI socket, waiting for messages with json content serialized as netstring. There response will contain two destinations built with static values (sip:127.0.0.1:5080 and sip:127.0.0.1:5090), again serialazed as netstring.
-<code js kanapi.js>
+To read more about nestring format, see:
+  * https://en.wikipedia.org/wiki/Netstring
+Node.js application:
+<code javascript kanapi.js>
 var net = require('net');
@@ Line 1017: / Line 1080: @@
 </code>
+===== Resources =====
+  * [[http://www.kamailio.org|Kamailio Project]]
+  * [[http://kamailio.org/docs/modules/stable/modules/evapi.html|Kamaialio EVAPI Module]]
+  * [[http://kamailio.org/docs/modules/stable/modules/rtjson.html|Kamailio RTJSON Module]]
+  * [[http://kamailio.org/docs/modules/stable/modules/rtjson.html|Kamailio JANSSON Module]]
+  * [[http://nodejs.org|NodeJS Project]]
+  * [[https://en.wikipedia.org/wiki/Netstring|Netstring Format]]

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