Connect - Siemens 475IP at FB7270

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Hello,
I hung Siemens a C475IP as SIP telephone (620) to my Fritz box. Functions all super - up to connecting on other devices at the Fritz box.

If I have a discussion, further inquiry introduce and select and to connect wants the internal (or also external) number, the call always returns. What can lie?

It rings with the other equipment then, which discussion held, but as soon as I present and wants to hand over, comes error 485 (I believe) and then rings it than recall again with the first telephone!

Thanks for references! Connecting must be possible nevertheless also with SIP, or?

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No, unfortunately not:

http://www.ip-phone-forum.de/showpos...5&postcount=11