I have Sipura 3000 behind the NAT (DSL modem +Linksys WRT54 router).
Sipura is registetered with Voxalot.
Out-bound calls are fine, but in-bound calls either drop on the first ring or do not stop ringing after Sipura's phone handset is picked up.
My Sipura's settings are exactly as in
Voxalot and VOIP Tutorial: A Comprehensive Walkthrough
I guess something needs to be changed in Sipura settings. Please advice