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===========================
Generate Capability Tokens
===========================
`Twilio Client <http://www.twilio.com/api/client>`_ allows you to make and recieve connections in the browser. You can place a call to a phone on the PSTN network, all without leaving your browser. See the `Twilio Client Quickstart <http:/www.twilio.com/docs/quickstart/client>`_ to get up and running with Twilio Client.
Capability tokens are used by `Twilio Client <http://www.twilio.com/api/client>`_ to provide connection security and authorization. The `Capability Token documentation <http://www.twilio.con/docs/tokens>`_ explains indepth the purpose and features of these tokens.
:php:class:`Services_Twilio_Capability` is responsible for the creation of these capability tokens. You'll need your Twilio AccountSid and AuthToken.
.. code-block:: php
require('/path/to/twilio-php/Services/Twilio/Capability.php');
$accountSid = "AC123123";
$authToken = "secret";
$capability = new Services_Twilio_Capability($accountSid, $authToken);
Allow Incoming Connections
==============================
Before a device running `Twilio Client <http://www.twilio.com/api/client>`_ can recieve incoming connections, the instance must first register a name (such as "Alice" or "Bob"). The :php:meth:`allowCclientIncoming` method adds the client name to the capability token.
.. code-block:: php
$capability->allowClientIncoming("Alice");
Allow Outgoing Connections
==============================
To make an outgoing connection from a `Twilio Client <http://www.twilio.com/api/client>`_ device, you'll need to choose a `Twilio Application <http://www.twilio.com/docs/api/rest/applications>`_ to handle TwiML URLs. A Twilio Application is a collection of URLs responsible for outputing valid TwiML to control phone calls and SMS.
.. code-block:: php
$applicationSid = "AP123123"; // Twilio Application Sid
$capability->allowClientOutgoing($applicationSid);
:php:meth:`allowClientOutgoing` accepts an optional array of parameters. These parameters will be passed along when Twilio requests TwiML from the application.
.. code-block:: php
$applicationSid = "AP123123"; // Twilio Application Sid
$params = array("Foo" => "Bar"); // Parameters to be passed
$capability->allowClientOutgoing($applicationSid, $params);
Generate a Token
==================
.. code-block:: php
$token = $capability->generateToken();
By default, this token will expire in one hour. If you'd like to change the token expiration time, :php:meth:`generateToken` takes an optional argument which specifies `time to live` in seconds.
.. code-block:: php
$token = $capability->generateToken(600);
This token will now expire in 10 minutes.

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