昨天拿到一對偉橋的 LP-600N 話機，號稱是 IPv4/IPv6 Dual Stack.
很開心地裝起來試。
不過 firmware 是舊版的，只支援 IPv4. 今早請工程師透過遠端更新，
目前已支援 IPv4/IPv6.
Issue 1: LP600N has some interoperability problem with our
IP-PBX. After the call setup, we can hear the speaking from it, but
the caller at the LP600N still hears the ringback tone.
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