We're using Asterisk and I have an extension setup to use on my N900. The extension registers fine and I can place SIP calls from my N900 to another extension and there's two way audio.

However, if I call from the other extension, to my N900 extension, the N900 never rings. Asterisk shows the call being placed but it never shows up on the N900. I don't see any errors in the Asterisk logs either.

Any thoughts?