Polycom MGC-25 Release Notes page 36

MGC Release Notes - Version 9.0
New MPI Flag
In the system.cfg a new MPI flag SIP_REFER_MPI_PREFIX= <value> has been added to
the SIP_REFER_PREFIX_AND_PHONES section. The dialout example shown on the
previous page shows the prefix <value = 555> as it should be configured in the system.cfg.
Figure 2: Sample system.cfg file
The system.cfg flag DIGITS_IN_PHONE_NUMBER=<VALUE> has been
removed from the version.
To dial out to another Office Communicator using MPI:
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Start a new conference.
Add a participant that is away or offline to the conference.
In the Office Communicator Contacts list, right-click the contact to
call, click Call via Conferencing Service, and then click Other.
Select either New Address or New Phone Number.