Smart Contacts


Smart Contacts feature resolves address book of the user on the server and finds contacts which are using the same service. When the app knows this information, it can offer additional communication options to these users and show them with a special badge or color.


Verified phone number

In order to make Smart Contacts work and be accurate, it’s necessary to know the correct phone number of the user which is using the app. Ideally it will be the number under which he/she is known in address books of other people.

Phone Number Verifier web service is used to verify phone numbers during provisioning, typically via SMS confirmation.


Phone Number Verifier web service is only available for Cloud Softphone White Label apps. Smart Contacts functionality is not possible with generic Cloud Softphone app.

Contacts server

Address book resolution is done on the server, where address books of all other users using the same phone service are also stored. Contact Sync is therefore required for Smart Contacts to work.

SSO Server

SSO server is required by Contacts server.

Example workflows


The workflows below are provided in an effort of making understanding of this functionality easier. The processes described here are implemented by Acrobits software and no additional work is needed to make them work.

Initial situation

Mobile Cloud Softphone White Label app is freshly installed on a mobile device. Smart Contacts are enabled and properly configured for this app on Cloud Softphone portal.

A. Phone number verification and provisioning

  1. The app is launched and asks users for his phone number. The phone number will be provided in full international format, the app will help user to enter the number correctly.

  2. User submits the number and Phone Number Verifier web service is called. This web service should send an SMS to the provided number with a verification code.

  3. The user receives SMS and submits the correct verification code. External provisioning web service will be called.

  4. External provisioning will receive the following data: phone number, verification code, cloud id. It should check whether there already is a SIP account attached to this phone number and create a new one if it isn’t. Account credentials are then sent as a response back to mobile client, which uses them to register to SIP server.


After this step is complete, the provider should have a record in its database which links user’s SIP account with user’s verified phone number. On the other hand, the client knows its SIP username and SIP password.

B. Obtain Access token from SSO server

The process is exactly the same as described in Contact Sync workflow

C. Create Smart Entry

  1. The app sends a request to Contacts server to become a “smart” contact. It will authenticate itself with access token and passes SIP uri where it can be reached( sip-username@sip-domain)

  2. Contacts server will validate the access token and get the list of verified phone numbers related to it.

  3. Contacts server will create records in its smart contacts database, which say: Verified phone number XYZ may also be contacted via SIP uri The phone number is verified by Phone Number Verifier, the SIP uri by External Authentication


It’s very important to always return consistent results from external provisioning and external authentication web services.

External Authentication should always respond with numbers which have been used to register SIP account whose credentials were sent as input.

External Provisioning should always check whether a SIP account for given number already exist and return the same one if it does.

Inconsistent web service responses will lead to inconsistent contacts database and Smart Contacts feature will most likely not work correctly.

D. Find which contacts are “smart” in mobile device address book

  1. The app sends a query to Contacts server to get all smart contacts from local address book

  2. Contacts server scans the server-side copy of mobile device address book. For each number for which Smart Entry exists, include it in the response together with its SIP uri

  3. Response is sent to mobile app, which will use it to highlight contacts with smart numbers and offer additional features for them.