NEC SL1000 Features And Specifications Manual page 507

ISSUE 2.0
After Callback answered, but does not send any DTMF:
1. Call the system Trk1 from the Mobile Phone setting as a mobile extension (Ex 150).
2. The Mobile Phone user hangs up within 3 seconds, before system answers.
3. System makes the Callback to the Mobile Phone.
4. The Mobile Phone answers within 15 seconds.
5. The Mobile Phone hears a dial tone but does not send any DTMF within 30 seconds.
6. System disconnects the call.
Features and Specifications Manual
SL1000/SL1100
M
1-497