[Serusers] Run SER on LAN

Hi, Can I run SER on LAN? I'm trying to connect a Xten Light and a GrandStream HandyTone 286 device in a LAN environment. It allow me to call each other. Now I want to move one step ahead by connecting the 286 in LAN while the Xten Light are connecting from remote site. This time, I cannot call 286 device, it gave me time out error, what am I missing? Please help. Thanks ST Ooi ________________________________________________ Message sent using UebiMiau 2.7.2 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.8 - Release Date: 2/14/2005