Caller name presentation should be empty if display name not set
Issue : When we have valid Userinfo but If display name is not given ,the code was setting name to "0".
Fix : Since the name is not valid ,no need to set it to any value(its a empty string by default).
Calls Output in endpt logs after fix : endptmngr: Signal callid=03221456, 02890791234,"" was set for line 3 endptmngr: Signal callid=03221501, 447123583496,"" was set for line 3 endptmngr: Signal callid=03221502, 07123583496,"" was set for line 3 endptmngr: Signal callid=03221503, 003537123456,"" was set for line 3