Requirements; Limitations - NEC Univerge SV9300 Programming Manual

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Requirements

With the SV9300, a VoIP gateway daughter board is required in addition to
licensing for IP (SIP) trunks.
A minimum of four IP (SIP) trunks are required due to the NEC Communications
Server infrastructure setup.
The system software for the NEC Communications Server should be version
V3.2.1 or higher.
NEC recommends that the requirements and programming are completed with as
much information as possible before scheduling an activation appointment with
your SIP trunk provider.

Limitations

The following limitations apply:
Faxing is not supported for Spectrum Enterprise SIP trunks, it is

recommended to have analog lines for faxing and modem connectivity.
SIP diversion header is not supported – Call forwarding to 8xx numbers

SIP Privacy – Cannot mark the calling party number as private or

restricted
Secondary SIP server for failover is not supported

Spectrum Enterprise SIP trunks are supported as registered and

non-registered.
Spectrum Enterprise
SIP Trunk Programming Guide