NEC UNIVERGE SV8100 Features & Specifications Manual page 704

Issue 5.0
The Callback to Cell Phone feature is not supported when using an analog trunk.
If Flexible ringing is set, the Callback to Cell Phone feature works in any type of Program
22-02-01 trunk setting. If Flexible ringing is not set, the Callback to Cell Phone feature does
not work if the incoming call type is "DID/DISA".
After answering Callback, if the system does not receive a DTMF signal from the Mobile
Extension using Program 20-18-01 (Default; 30 seconds), the system disconnects the call.
The trunk user for SMDR for Callback is tied to the extension number of Mobile Extension.
If the user calls a Mobile Extension port during while using the Callback to Cell Phone
feature, the caller hears a busy tone.
The Callback to Cell Phone feature can be used on the K-CCIS network. AspireNet/Netlink
can be used for the Callback line, but not for the incoming line.
Default Setting
No Mobile Extensions are configured.
System Availability
Terminals
Any Multiline Terminal
Required Component(s)
None
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UNIVERGE SV8100
Mobile Extension