發現答案了

http://forums.logitech.com/t5/Logitech-Vid/DLink-DIR-615-and-SIP-and-VID/m-p/360050

與上一個firmware (3.01)相比, 3.10及以後的firmware在firewall項目下增加了4個選項. 如果采用default設置就會給SIP設備帶來問題. 解決方法就是uncheck其中的sip box.

The D-Link 615 runs a so-called Application-layer Gateway (ALG) for SIP, which interferes with our SIP traffic and should be disabled:
- log into the admin page of your router
- select the 'Advanced' pane, and then 'Firewall Settings'
- scroll down, and *uncheck* SIP

所有跟帖： 

• 可能還是最終的解決 -Landsend- ♂ (650 bytes) () 12/17/2009 postreply 10:37:17