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On the FAQ section, use the search term '4300' and it should provide a link with screenshots on how to change your 4300 to bridge mode.
Taken from this post:
»Gigaset/Sagem 4300 Bridging Instructions
Updated from Icon :
The full pdf file for the 4300 which has some additional steps:
From this topic:
»[Equipment] Gigaset 4300 Bridge problem