Hi When I make a call with the Grandstream GXP-2000 through Asterisk (and SER) to landline using VSP, after I hang up the call the other party are still connected for another 30-40 seconds. I've notice that the SIP BYE is sent to Asterisk, but Asterisk sends no SIP BYE on to VSP. When I use the SPA-941 the call terminates on the other right away soon as I hang up. I have updated the GXP-2000 to latest firmware: Software Version: Program-- 1.1.0.11 Bootloader-- 1.1.0.1 I'm wondering if this GXP-2000 problem or something else? Thanks -- Shaun