Provider

\Bitrix\Crm\Provider name subspace contains classes for handling activity provider.

Class	Description	Available from version
Base	Base class for handling activity provider.
Call	Handles calls.
CallList	Handles call list.
ExternalChannel	Handles external channels.
Livefeed	Handles history in CRM entity details.
OpenLine	Class handles Open Channels.
ProviderManager	Handles activity providers.
Sms	Handles SMS.
Visit	Handles offline customer visits.
Wait	Handles Wait activity.

To register activity provider, subscribe to the event OnGetActivityProviders:

RegisterModuleDependences('crm', 'OnGetActivityProviders', 'my_module', 'myClass', 'getActivityProviders');

your method myClass::getActivityProviders must returns array in the following format:

array(
    'MY_MODULE_PROVIDER_ID' => '\Bitrix\MyModule\Activity\Provider\MyProvider'
)

where array key is provider ID, value - provider class name (must be descendant to \Bitrix\Crm\Activity\Provider\Base).