Additions:
- Support PEM format for certification.
- This version 22.17 was proven not to support VLAN for TGP500.
- Support DHCP option60 with value "Panasonic".
- Allow user to access to "Multi Number Settings". [CUSTOM_WEB_PAGE](4:Enable)
- Add the setting the HTTP Client Authentication WebGUI for the digest authentication.
- Support SIP session refresh by UPDATE method.[SIP_SESSION_METHOD](1:re-INVITE 2:UPDATE 3:auto)
- Change SYSLOG output information from "File Error" to "Decode Error", when the decode failure file(configuration/firmware) is detected.
- When TGP5xx receives 304 response from the server, TGP acts like TGP succeeded in file download. But TGP runs with the last configuration file. CONFIG_SINGLE_MODE_ENABLE (Y:Enable N:Disable)
- It becomes to be possible to downgrade the firmware to version 12.10.
- When 181 Call is Being Forward, the incoming ringer is not rung.
- Support report (RFC3581).[SIP_ADD_REPORT_n](Y:Add the report parameter N:Do not the report parameter)
- Support port punching for RTP.
- Remove port parameter on Request URI of initial request.[SIP_REQURI_PORT_n](Y:Add the port parameter N:Do not the port parameter)
- Give up to send REGISTER when receive 403 Forbidden from Server.
- SYSLOG output full MAC address.
- SYSLOG output with "URL" and "filename".
- Change SYSLOG output level from warning to info, when receive "304 Not Modified" response from sever.
- A default value of configuration of DNS failover is changed from "N" to "Y".
- A default value of configuration of DNS SRV from "N" to "Y".

Corrections:
- Improve the session refresh control for quality.
- When the settings from Web GUI reaches more than 256 times, the settings can not be rejected with "Error(Failed)" message on the Web GUI shows.
- Change to refresh the session by the result of the negotiation even if the session timer is enable.

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