Section: 4.3.12.5 QoS for Emergency Services
Content: Where local regulation require supporting calls from an unauthorised caller, the MME may not have subscription data. Additionally, the local network may want to provide IMS emergency services support differently than what is allowed by a UE subscription. Therefore, the initial QoS values used for establishing emergency bearer services are configured in the MME in the MME Emergency Configuration Data. NOTE: For IMS emergency services prior to this Release of this specification, dynamic PCC support was not required in the specifications. In such cases, the PDN GW sets the ARP value that is reserved for emergency services, which the PDN GW bases on the usage of the Emergency APN. This functionality is used by the Attach procedure and by the UE Requested PDN Connectivity procedure, in both cases when establishing emergency bearer services.