All U1900 series unified gateways support SIP/SS7/PRA/R2/QSIG Trunk.
U1910/U1911/U1930/U1960/U1981 also support AT0 Trunk, U1980 doesn't support AT0 Trunk.
U1911/U1960/U1981 support BRI Trunk, while U910/U1930/U1980 doesn't support BRI.
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.
Method of performing the loopback test for the E1 line on the U1900:
- Physically connect a pair of tx and rx ports of the E1 line, and obseve the RFA indicator and LOS indicator on the U1900. If they are both off, the local loopback test is successfully.
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