Wireless VoIP has the potential to provide voice services over IP networks. However, there are challenges around quality of service, network delay, and signaling. Contention for bandwidth on the uplink poses problems for delivering consistent voice quality. Packet loss and delay degradation must be managed through techniques like redundancy. Signaling protocols like SIP provide a cleaner architecture than alternatives like H.323 or MGCP, but mobility support must be addressed. Wireless carriers also face issues around losing control of services and pricing models as voice shifts to IP networks.

1. Wireless & VoIP

3. Interactive voice quality, Component #1: delay

6. Packetization frequency: Size => Delay => Quality

7. Bandwidth => Quality Delay => Header/Payload ratio

12. Signaling & Mobility: Combine “Mobile IP”, SIP SIP agent Correspondent DHCP Register Invite DHCP DHCP Register Invite #2