Gateways & ATAs



I have a HT503 Handytone and I want it upgraded to the latest version of software which allows for different providers for inbound and outbound calls.

The upgrade on Grandstream website comes with only one file. The current version of my HT503 asks for a number of files. It is possible that I have to make an intermediate upgrade which is no longer available for download.

Please advise,
Thank you,

Marian Lumpan


I’m not sure if that feature exists, unless one is a SIP line and the other the analog line.

Anyway, if your HT503 is asking for multiple files when upgrading, then open a Support ticket and they will provide all the “intermediate” files until you reach the latest version.