1.67 changes:
1. Removed duplicated "Via" head check in SIP protocol, because the new ET China system will send duplicated "Via" head.
2. Optimized SDRAM refresh rate register settings.
3. Restored RTL8019AS software over-optimization to solve ET6602(PA168T) unsteady problem.
4. Fixed an IAX2 outgoing voice bug when used as callee, this bug was the result of 1.57 changes.


1.65 changes:
1. Modify file status display to speed up all kinds of upgrade.
2. Modem support is separated with OEM_MODEM define. Normal upgrade files will not have modem function, which will have better performance.


1.63 changes:
1. Removed duplicated IP address check
2. Fixed a logon status bug when SNTP not used
3. Fixed a busy tone generation bug
4. Added compiled Palmtool.exe in bin directory


1.59 changes:
1. Fixed an UDP checksum bug
2. Fixed an iLBC payload type bug
3. Added new venezuela timezone VST(GMT-4:30)

