VoIP service continuity across HRPD and 3G-1x networks

Service continuity is an important aspect as the existing circuit-based networks evolve towards packet based 3G networks and beyond. VoIP is considered to be the major application in the evolved networks to low cost voice and advance services. This paper discusses the issues surrounding VoIP service continuity, with a 3G-1x network overlaid with HRPD in perspective. Due to deployment considerations, border areas are created between the technologies, wherein VoIP services in the HRPD network have to be seamlessly handed-over to circuit-voice call in the 3G-1x network. This paper explains a mechanism that has been evolved to ensure that VoIP service continuity is maintained across HRPD and 3G-1x networks.