v2.2.9-ETU-normal-idc-v20-squashfs-combined-efi-c7b77cac.img	
		*Added failover feature
		*Added OIAD FXO single SIP/multiple SIP mixed binding with Port +group
		*Added support that local DNS SRV resolution implementation for single server registration
		*Added digital PRI support for routing by channel group
		*Added support that SIP setting compatibility mode identity_mode associated modification
		*Added support for tel protocol header of UAC
		*Added RFA light support for SS7
		*Added handling for registration returning 403 and other failures
		*Added Japanese support
		*Fixed the problem of insufficient memory resource 
		*Fixed the problem that web template configuration for quality authentication has opposite effect to actual result
		*Fixed the problem that analog phone gets incorrect time 
		*Fixed the problem that unable to register successfully after registration count reaches server max_contacts value
		*Fixed the problem that /etc/config/network exception occurs after upgrading to the latest compiled version.
		*Fixed the problem that wrong description of echo cancellation parameter 
		*Fixed the problem that call failure when incoming IMS line's To number does not match the registered number
		*Fixed the problem that MTU shows DAHDI status as OK even after unplugging the line
		*Optimized auto-deployment
		*Optimized CDR query list

v2.2.7-ETU-normal-idc-v20-squashfs-combined-efi-5c2c1093.img.gz
		*Added upnp function
		*Added SoftEther VPN
		*Added NAI related parameters
		*Added ss7 related parameters 
		*Added TLS1.3
		*Added mtu option setting in WAN and MGT
		*Fixed the problem that wireshark can't parse signaling ss7 packet correctly 
		*Fixed the problem that the maxchannels parameter in DGW OEM is not used correctly
		*Fixed the problem that customer failed to test fax at TM
		*Fixed the problem that trunk Status page registration status is not correct.
		*Fixed the problem that /etc/config/network exception occurs after upgrading to the latest compiled version.
		*Fixed the problem that log management_support log page save unprompted
		*Fixed the problem that the firmware reported “exceeding 30M upload file limit”
		*Fixed the problem that the /usr/sbin/odhcpd process reports an error in bridge network mode with dual NICs
		*Fixed the problem that the firmware download via server fails on some HTTPS servers
		*Upgraded system related sys_* class to check_input2 check
		*Optimized ODG UPnP page
		*Optimized the function that T1 to E1 switch to HDB3 encoding by default
		*Optimized the function that initialization of network information is changed to read json to deal with differential, including API interface reading.