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Yearstar TG200G: Which MSN/DDI is send over SIP?

Hello. 

from where is the MNS/DDI taken by the Yearstar TG200G
that is send over SIP?

I have connected to a Fritzbox 7490 to the Yearstar TG200G.

It works if I configure the Fritzbox to accept all MSN/DDI,
but if I restrict it to a list of MSN/DDI, then the telephone
does not ring.

Thanks.
Frank

 

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