City Lifeline hosts multiple SIP Trunking providers in its central London colocation data centre. SIP Trunking replaces conventional voice telephone or ISDN lines. SIP Trunking connects the hosted PBX to the PSTN public telephone network. Most of the major UK SIP Trunking providers have a presence in the London colocation data centre.

Magazine article from Comms Business magazine. It covers the choice of a London colocation provider by Dolphin Communications. Dolphin chose the City Lifeline London data centre for their new telecoms business operations.

Extra carrier interconnects are available to City Lifeline London colocation customers via a private dark fibre interlink to London Telehouse North (THN). London colocation customers gain from the choice of carriers at both London data centres. City Lifeline can act as a London mirror data centre or as a London backup data centre away from the Docklands flood plain.