.. _contact_sync:

======================
Contact Sync (Legacy)
======================


Introduction
============

Contact Sync is an advanced, optional feature of Cloud Softphone which uploads contacts from a mobile device to Contacts
server and keeps the server-side copy up-to-date.

The server-side copy of contacts is used for Smart Contacts. The server checks which people from the address book use
the same service and offers on-net calls with extra features like video calls or file transfers for such contacts.

Requirements
============

Contacts server
~~~~~~~~~~~~~~~
The server which stores the contacts and provides APIs to clients to keep the contacts in sync. The server is available
either as a binary for Linux, installable on premises of provider, or as a hosted solution by Acrobits.

For providers who prefer hosting their own Contact Sync server, see the
`installation instructions <https://doc.acrobits.net/server-components/contact-sync/>`_.

SSO server
~~~~~~~~~~
Single Sign On server, which validates SIP username&password using :ref:`ext_auth` web service and creates
access tokens, which clients use to authenticate themselves. This server is also available either as a binary for Linux
to be installed on premises of provider, or hosted by Acrobits.