Grandstream HT502 ATA Firmware 1.0.12.8

BUG FIXES:

- Fixed download device configuration via web UI returns abnormal result
- Fixed if some port accumulated more than 10 call dialogs, the port cannot make a call
- Fixed HTTP User-Agent does not match other Grandstream Products. Removed quotation marks from user agent
- Fixed device cannot use DNS response if it includes CNAME type
- Fixed when registered to outside SIP server remotely, SIP server cannot receive register request
- Fixed device rejects SIP reply from Outbound Proxy under some conditions
- Fixed SIP server and Outbound Proxy cannot be configured with host address like x.x.x.0

ENHANCEMENTS:

- Added support to announce the registration number via feature code