Ofcom today proposed that all VoIP phone services allowing users to make calls to ordinary phone numbers must also offer access to make 999 emergency calls.
http://www.theregister.co.uk/2007/07/26/ofcom_proposes_voip_999/
uk: VoIP services must offer 999, says Ofcom
Ofcom today proposed that all VoIP phone services allowing users to make calls to ordinary phone numbers must also offer access to make 999 emergency calls.