ContactEndpoint phone, Lync 2013 - contacts

Question

my application that uses Lync 2013, communicates with a server via websocket, and receives notifications.
These notifications are in Json format, so I convert it to extract a string.
The string is a phone number, and I want to test if one of my contacts are the same phone number to display his name.
My If is always "false".
I wanted to use > and extract the value of DisplayName (phone number as string) but i didn't know how to do it.
This is my code.
foreach (var group in client.ContactManager.Groups)
{
foreach (Contact contact in group)
{
List<object> endpoints = (List<object>)contact.GetContactInformation(ContactInformationType.ContactEndpoints);
List<object> phoneNumbers = endpoints.Cast<object>().Where<object>(N => ((ContactEndpoint)N).Type == ContactEndpointType.HomePhone ||
((ContactEndpoint)N).Type == ContactEndpointType.MobilePhone ||
((ContactEndpoint)N).Type == ContactEndpointType.WorkPhone ||
((ContactEndpoint)N).Type == ContactEndpointType.OtherPhone).ToList();
if (phoneNumbers.ToList().Contains(call.caller))
{
MessageBox.Show(contact.GetContactInformation(ContactInformationType.DisplayName).ToString());
}
}
}

Answer 1

You can ask the contact manager for a contact directly by the number formatted as a tel URL. e.g. "el:12345678"
e.g.
var contact = client.ContactManager.GetContactByUri("tel:" + call.caller);