CSL launches voice for LTE handset users via Circuit Switch Fallback

22 Feb 2012

Hong Kong cellco CSL unveiled its first handset operating on its Long Term Evolution (LTE) network on Saturday, offering voice services via Circuit Switch Fallback (CSFB) to those purchasing the HTC Velocity 4G smartphone, reports Light Reading. The Velocity device works on CSL’s integrated LTE and DC-HSPA+ network which it launched in 2010. The report notes that CSL is one of the first operators in the world to implement CSFB to support voice calls on LTE handsets, following launches by AT&T and Rogers Communications in the US and Canada respectively. CSFB fallback is being used both as an interim solution on 4G networks ahead of voice over LTE (VoLTE) becoming commercially available – potentially by the first quarter of 2013 – but also for longer-term use as a roaming voice solution outside of 4G coverage areas.