RAT-Type Attribute
The RAT-Type Attribute (attribute type 1032) specifies the radio access technology type. It occurs in AAR and RAR messages received by the P-CSCF. For purposes of NPLI, the following values are supported:
0 - WLAN 1 - Virtual (indicates that RAT is unknown) 1000 — Universal Terrestrial Radio Access Network (UTRAN) 1001 — GSM Edge Radio Access Network (GERAN) 1002 - GAN (Generic Access Network) 1003 - HSPA_EVOLUTION (Evolved High Speed Packet Access) 1004 — Evolved UMTS Radio Access Network (EUTRAN) 2000 - CDMA2000_1X (core CDMA2000 wireless air interface) 2001 - HRPD (High Rate Packet Data) 2002 - UMB (Ultra Mobile Broadband) 2003 - EHRPD (Enhanced High Rate Packet Data)
In the event that a received RAT-Type attribute contains an unsupported type, an error condition is declared and the default PANI is used.