Hi, I got a strange problem that I don't really understand, and I hope that you could give me some hint how to fix that: When I dial out through a gateway that is defined in the sip_profiles/external , (The xml file is simple as below. ) I cannot talk or hear from the other end. But when I put the line on hold, two ends can hear music, and when open the line again, this time 2 ends can hear and talk. Is there any where that I can fix this problem? Thank you <include> <gateway name="mygw"> <param name="username" value="myusername"/> <param name="realm" value="my_sip_server.com"/> <param name="password" value="mypassword"/> <param name="proxy" value="my_sip_server.com"/> <param name="expire-seconds" value="600"/> <param name="register" value="true"/> </gateway> </include>