======================================================================
V2.2.6.15144:Date:2013-11-01
======================================================================	
1. Flexible network type changing via LCD.
2. Flexible phone book and speed dial application.

========================================================================
v2.2.3 Date 2013-08-01
========================================================================
1. Fixed two ringback tone problems
2. Dial plan supports IP calling and other rules supports digits over 7 length.
3. Fixed VPN connection problem
4. Fixed the same CALL-ID problem.
5. Add service name in PPPoE discovery message.
6. Add DHCP option66 auto provision.
7. Improved voice quality, AGC COM is changed to -10dB.

========================================================================
v2.2.2.13209 Date 2013-05-03
========================================================================
1. Fixed Authenticate ID problem.
2. Fixed hold message SDP to "0.0.0.0"
3. Fixed IP to IP calling problem from other models.
4. Add reorder time parameter to config hangup time.