Voice over IP over wireless LAN.

Voice is an increasingly important application for wireless networks, especially as WiFi handsets (or WiFi-cellular handsets) become available. In addition to our work to characterize the prevalence and behavior of voice traffic on the Dartmouth network, mentioned above [HKA04a,HKA04b], a few years earlier we experimented with methods for voice-call roaming in a wireless LAN. In her senior thesis, Ayorkor Mills-Tettey developed a fast call-handoff method for devices that roam across subnet boundaries, implemented it using the H.323 protocol stack, and conducted experiments to measure handoff latency [MT01]. She later published her thesis as a conference paper [MTK02], where it won the Best Student Paper award.

Simultaneously, we recognized the need for a distributed directory service to allow callers to find the desired party, even when the remote party was roaming across subnet boundaries; Ammar Khalid designed and implemented such a service (and integrated it with Ayorkor's system) in his senior honors thesis [Kha01].