For companies with several sites, calls between offices become free of charge.
SIP Trunks connect to telephone system that is either installed on your own site or hosted in a data centre. This allows virtual communication through a connection traditionally used only for Internet access.
Direct Comms can install SIP Trunking over any suitable data connection such as broadband, FTTC, Ethernet or VPN.
As well as reducing costs SIP Trunks allow you to do things that are not possible with ISDN. For example you can pre-configure a full business continuity plan. This can divert calls on a per DDI basis in an emergency and have any telephone number you like.
With SIP you are no longer restricted to the local BT exchange and can open up a whole world of new business opportunities.