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Last internal in calling group result always busy through ISDN trunk forward

After upgraded an S20 to the last firmware, the incoming call through ad ISDN trunk (B2 module) cannot be forwarded to the last internal in the calling group as he will result always busy, even not, but free for internal calls. I resolved, right now, only add a new "ghost" internal and add it to the calling group. The phone is a Yealink T27G with last firmware 69.83.0.10.

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