[Serusers] SIP VoIP Problem & Shorewall

Hi, I am struggling to get SIP (session initiation protocol) VoIP software (SIP Express Router + XTen/KPhone/Linphone) and hardware (Grandstream SIP IP Phone) to work with Shorewall. The best result I have achieved is when I can call (or someone call me), hear sound, but my talk is not transmitted for weird reason. I have quite standard configuration - two-card Linux PC with shorewall (one static external IP + static local IPs 192.168.0.xxx), opened ports are 5060 tcp/udp, 5004 udp (for Grandstream), and 8000-8020 udp (for XTen, Linphone). SER itself is hosted by the independent provider, and other people who have another router/firewall software do not have similar problem. It looks like something is wrong with NAT or masquarading. May be someone will be kind to e-mail (or post on this mailing list) their Shorewall configs (masq, nat, rules, etc.)? My e-mail is andreil1(a)starlett.lv Thanks in advance. ********************************************* * Best Regards --- Andrei Verovski * * Personal Home Page * http://snow.prohosting.com/guru4mac/ * Mac, Linux, DTP, Development, IT WEB Site *********************************************