
	********* Firmware Version 4.09c  Note *****************
						     Date:05/16/92

   Bug fixed

   1. V.22 bis calling tone ( 1300 Hz, some peple say V.25bis guard tone ) can
      trig U-1496 modem to switch to fax receiving. This bug fixed.

      Only 1100 Hz ( FAX calling tone ) will switch modem to fax receiving.
      Thers is no need to set bit 7 of s41 now.

   2. Two multi-auto modem handshake to 2400 or fail if answer end delay to
      answer ( Example: answer machine ahead ).

   3. Fax calling tone stop when the other end off hook or voice answer.


   New Change

   1. 100 ms delay changed to 480 ms delay after dial tone detected to dial
      first digit. Some slow PBX need this delay to handle first digit.


	********* Firmware Version 4.09d  Note *****************
						     Date:05/23/92

   1. Add compatibility with some Nokia ECM 4896.


	********* Firmware Version 4.09f  Note *****************
						     Date:05/24/92


   1. Reset serial port speed according the value of s18 after DTR drop when
      &D3 and s38=8 was set.


	********* Firmware Version 4.09g  Note *****************
						     Date:05/24/92

   Performance improved

   1. V.23 can survive 3002 channel now.
   2. Less burst data to DTE now. This could reduce the errors when high DTE
      speed chosen and no 16550 used.

   Bug fixed

   1. AT+FAA=0 could be saved to profile, this bug fixed. The default value
      always 1, if you want to change the value you have to issue command

   New Change

   1. Two rings comes within 1 second will be recongnized as only 1 ring.
   2. Double the time of scan line (space stuffing) for some fax machine
      without buffer or with slow print head.
   3. Decrease the sensitivity threshold to initiate Fast Rate re-Negotiation
      to against slight gain hit, impulse noise and frequency shift.

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