What's Annex A and Annex B? How can I know if my router firmware is correct?

Annex A : ADSL over POTS ( analog phone line )

Annex B : ADSL over ISDN ( ISDN phone line )

UR2 : For V2600, it is same as Annex B. UR2 is German standard.

The hardware of V2600 is different on Annex A and Annex B model. You can get the firmware

information as below.

Do not worry that you may use wrong firmware version. V2600 will automatically check if the

firmware is applied to the hardware when you try to upgrade new firmware to router.