What services does the U1900 series unified gateway support

The U1900 series unified gateway mainly supports two types of services: basic services and supplementary services.
- The basic services include intra-office calls, narrowband inter-office calls, and broadband inter-office calls.
- The supplementary services supplement basic call services, including calling line identification presentation (CLIP), call forwarding, call transfer, call hold, call park, call waiting, three-way calling, conference call, and outgoing call barring (OCB) services. For more details, see the Feature Guide of the U1900 product documentation.