show short session id for callee/caller name

Session/Calls/Call Management/SessionCall.swift

@@ -18,7 +18,7 @@ public final class SessionCall: NSObject, WebRTCSessionDelegate {
     var answerCallAction: CXAnswerCallAction? = nil
     var contactName: String {
         let contact = Storage.shared.getContact(with: self.sessionID)
-        return contact?.displayName(for: Contact.Context.regular) ?? self.sessionID
+        return contact?.displayName(for: Contact.Context.regular) ?? "\(self.sessionID.prefix(4)))...\(self.sessionID.suffix(4))"
     }
     var profilePicture: UIImage {
         if let result = OWSProfileManager.shared().profileAvatar(forRecipientId: sessionID) {

SessionMessagingKit/Messages/Signal/TSInfoMessage+Calls.swift

@@ -11,7 +11,7 @@
         var contactName: String = ""
         if let contactThread = thread as? TSContactThread {
             let sessionID =  contactThread.contactSessionID()
-            contactName = Storage.shared.getContact(with: sessionID)?.displayName(for: Contact.Context.regular) ?? sessionID
+            contactName = Storage.shared.getContact(with: sessionID)?.displayName(for: Contact.Context.regular) ?? "\(sessionID.prefix(4)))...\(sessionID.suffix(4))"
         }
         if caller == getUserHexEncodedPublicKey() {
             callState = .outgoing