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Types of Emergency Calls in 802.11u Unencrypted calls on networks using the Emergency Services Only (ESO) bit for signaling APs advertising the ESO bit will accept any non-AP STA without L2 security Network responsible for enforcing access control to only VoIP services with VLANs, ACLs, etc. Encrypted calls using public credentials Network is shared with other uses Default Emergency Services NAI gives non-AP STAs a user name to send in 802.1X/EAPOL to get access to emergency services Key exchange for L2 data security requires a PMK, which must be exchanged by either PSK or EAP method Regulatory requirements may require use of link encryption, which forces use of the public credential case |