CRM Network between Port 445(Microsoft-ds) and LDAP 389

Dears,

I have a concern regarding port 445(microsoft-ds) and  LDAP 389.  Is it mandatory to have port 445 on Microsoft Dynamics CRM application and SQL Server. ?

Can we use  LDAP Port – 389 instead of using port 445?

Can some one help me on the supportability aspect from Microsoft CRM.

Thanks in advance.

Regards,

Sidhant