Can anybody spot the problem? H.323 via GK calls Asterisk box and should be connected directly to the extension 6002 (an voice sip phone) The caller hears only ringing. The called party hears the ring. Called party picks up, caller hears still the ring tone. Called party hears nothing. Called party hangs up, caller hears the busy tone. extensions.conf: exten => 88670333333,1,Wait(1) exten => 88670333333,n,SayUnixTime exten => 88670333333,n,NoOp(If you know the extension ...) exten => 88670333333,n,Dial(${PHONE_6002}) sip.conf for phone 6002 has: ulaw;alaw [Jul 29 14:40:24] -- Executing Wait("H323/GVSC8770-533f", "1") in new stack [Jul 29 14:40:25] -- Executing SayUnixTime("H323/GVSC8770-533f", "") in new stack [Jul 29 14:40:25] -- Playing 'digits/day-5' (language 'en') [Jul 29 14:40:26] -- Playing 'digits/mon-6' (language 'en') [Jul 29 14:40:27] -- Playing 'digits/20' (language 'en') [Jul 29 14:40:27] -- Playing 'digits/h-9' (language 'en') [Jul 29 14:40:28] -- Playing 'digits/2' (language 'en') [Jul 29 14:40:29] -- Playing 'digits/thousand' (language 'en') [Jul 29 14:40:29] -- Playing 'digits/5' (language 'en') [Jul 29 14:40:30] -- Playing 'digits/at' (language 'en') [Jul 29 14:40:30] -- Playing 'digits/2' (language 'en') [Jul 29 14:40:31] -- Playing 'digits/40' (language 'en') [Jul 29 14:40:32] -- Playing 'digits/p-m' (language 'en') [Jul 29 14:40:33] -- Executing NoOp("H323/GVSC8770-533f", "If you know the extension ...") in new stack [Jul 29 14:40:33] -- Executing Dial("H323/GVSC8770-533f", "SIP/6002") in new stack [Jul 29 14:40:33] -- Called 6002 [Jul 29 14:40:33] -- SIP/6002-6949 is ringing bye Ronald