Global virtual local area network for voice communication sessions in a wireless local area network

A communication network has a first wireless access point (AP) in a first subnet segment and a second wireless AP in a second subnet segment, and provides a virtual local area network (VLAN) which spans the first and the second subnet segments. A mobile device associates with the first wireless AP using a first extended set service identifier (ESSID). In response to identifying a request to establish a communication session, the mobile device reassociates with the first wireless AP using a second ESSID, for accessing the VLAN to establish and maintain the communication session.