Pro
Nice looking phones
Conference calling
1PSTN + 1 VoIP channel and if you have multiple handsets then you can use both out going channels at once.
SMS messaging.
Cons
I can’t seem to get the MWI to work. Although It says that it does.
The web configuration page is still branded C450IP.
There is no shared number directory (you can send numbers from one hand set to another)
You can give handsets “friendly” names.
Siemens customer support are very difficult to talk to.
Phone System 