v1.0.0731.00 - Support RFC2396. - Send SIP packets back to source address instead of trusting the provided Via field. - User can switch consult and blind transfer from GUI or keypad. - Provide config backup/restore feature for phone. - Add GSM codec in menu tree. - Delay 1 second before playing the 2nd dial tone. - Support different ring tone by digit length of caller ID. - Change the unit of "On/Off Time" at "Tones Settings" page into millisecond. - User can press <HOLD> to change to another line when this line is disconnected and phone state not idle.