Siemens HiPath 3550, Quick Start Manual

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3. Summary and Limitations
A check in this box indicates the UM feature set is fully functional when using the PBX/gateway
in question.
Siemens HiPath 3550 PBX has several limitations when activating the voice mail functionality. The list
below describes these PBX’s limitations:
• When dialing from an external phone (PSTN) to a PBX’s user extension, and the call is
forwarded to the voice mail (for any reason), and then leaves a voice mail message to the
PBX’s user, the following limitation occurs: The PBX doesn’t support caller-ID from external
numbers and tags them as a call from 02222. Therefore, "02222" is displayed in the send field
of the voice mail message for all external numbers (PSTN).
• When performing blind transfer to an invalid number, the PBX doesn’t support invalid number
notification and the call is routed back to the original transfer user. When an invalid extension
number is defined in the Microsoft Unified Messaging for a particular user, and call transfer by
Directory Search to this user is requested, the user that requests this transfer is routed back
to the Microsoft Unified Messaging welcome prompt.