Siemens Gigaset C450IP & Asterisk 1.2

I’m a newbi and I just installed Asterisk 1.2.14 (mini version for my Linksys router). Before I bought Siemens C450IP phone I configured X-Lite soft phones on couple of laptops in my home and it worked ok but with C450ip I have a problem.

I entered it in sip.conf similar to my soft phones, added some dialing rules and outgoing calls from it are working ok. However, I cannot reach it from my softphones. Here is a part of debug output:

I don’t know if this is enough to diagnose the problem or you need full debug output and/or conf files.