Hello all! I am tryng to call from a Grandstream to a normal telephone. The net configuration is: Phone --- PBX --- Proxy ---- Gatekeeper ---- Asterisk ---- Grandstream When I try I call from a h.323 phone to the normal phone I have no problem. But when I try to call from Grandstrem to the phone that's the message I get: -- Executing Dial("SIP/03316404-1cba", "OH323/483317531|20|tT") in new stack WARNING[1082834224]: File asterisk.c, Line 234 (listener): Select retured error: Interrupted system call ERROR[1272687920]: File chan_oh323.c, Line 1004 (oh323_call): H323:0: Could not call 483317531. -- Couldn't call 483317531 -- Hungup 'H323:0' == Everyone is busy at this time The SIP message exchanged between the different parts are a INVITE - ACK - Proxy Authentification Required - INVITE (with Proxy Authentificatoin) - ?? And nothing else. Then I have the message I have written before. Someone can tell me where is the problem? Thanks! Mireia