NEC Univerge SV9100 - After Callback Answered, but Does Not Send any DTMF

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3. System makes the Callback to the cell phone.
4. The Cell phone does not answer the call within 15 seconds.
5. System disconnects the call.
After Callback answered, but does not send any DTMF:
1. Call the system Trk1 from the cell phone setting as a mobile extension (Ex 150).
2. The Cell Phone user hangs up within 3 seconds, before system answers.
3. System makes the Callback to the cell phone.
4. The Cell Phone answers within 15 seconds.
5. The Cell phone hears a dial tone but does not send any DTMF within 30 seconds.
6. System disconnects the call.