Singaporean telco StarHub has launched Session Initiation Protocol (SIP)-based voice-over-IP (VoIP) services for business and residential users on the island under the brandings ‘Digital Voice Travel’ (consumers) and ‘Digital Voice Business’. The company is also re-branding its existing residential fixed voice service ‘Digital Voice Home’ – which is only offered over StarHub’s cable broadband network – and is promising users lower call charges for using the service. From now until 31 December 2007, all Digital Voice customers will be able to make free unlimited Singapore-registered calls, while travellers will be able to make free unlimited SIP-to-SIP calls to Digital Voice users, provided both parties are using a StarHub-specified IAD adapter.