Rancore Technologies Pvt Ltd, Mumbai India.
This is the interface that exposes the behavior
of the P-User-Database header. We only have one
major value for this header, as per RFC 4457.
This value is the Database name. The DB here refers
to the IMS HSS. The DB name is encoded as a URI, delimited
by the < and > signs. There may be generic parameters for
this header encoded as URI parameters. They also lie between
the < and > delimiters. However, this URI is neither a SIP URI
nor a TEL URI. It is a DIAMETER AAA URI.The value of this AAA URI
is consumed by the S-CSCF. The S-CSCF can cache the value of the
HSS received in this header,thus optimizing the IMS registration
public final static String NAME = "P-User-Database";