Will the settings be reset after flashing the d-link 2500u adsl modem?

Question

SIP

there is a user, he has a d-link 2500u adsl modem, with firmware like 1.1, when calling via sip, the connection breaks for 6 seconds, googling found a solution to update the firmware to 1.5+ and uncheck ALG there as it interferes into traffic.
Since I don’t really want to flash it remotely in another city, will the settings be reset after the firmware? the user himself is unlikely to set it back

Answer 1

Reset or not, when updating firmware, you should always reset the device and reconfigure it in a new way, because. it is impossible to predict what has been updated in the firmware and whether the configuration file will work from the old one as it should. As Aleksey
clarifies , not just a configuration file, but positions of cells with settings in non-volatile memory.