Section: 21.2.2 Format of HA-APN Network Identifier
Content: The HA-APN Network Identifier follows the format defined for APNs in clause 9.1.1. In addition to what has been defined in clause 9.1.1 the HA-APN Network Identifier shall not contain "ha-apn." or "w-apn." and not end in ".3gppnetwork.org". A HA-APN Network Identifier may be used to access a service associated with a HA. This may be achieved by defining: - a HA-APN which corresponds to a FQDN of a HA, and which is locally interpreted by the HA as a request for a specific service, or - a HA-APN Network Identifier consisting of 3 or more labels and starting with a Reserved Service Label, or a HA-APN Network Identifier consisting of a Reserved Service Label alone, which indicates a HA by the nature of the requested service. Reserved Service Labels and the corresponding services they stand for shall be agreed between operators who have roaming agreements. As an example, the HA-APN for MCC 345 and MNC 12 is coded in the DNS as: "internet.ha-apn.mnc012.mcc345.pub.3gppnetwork.org". where "internet" is the HA-APN Network Identifier and "mnc012.mcc345.pub.3gppnetwork.org " is the HA-APN Operator Identifier.