Hi, all! when my h323 phone dial in Asterisk system, i can hear nothing. and the following is the log slice i picked from /var/log/asterisk/full. ps: i am using red hat AS5 kernel 2.6.18-53.el5,Asterisk-1.4.24.1, pwlib_v1_11_0, openh323_v1_19_0_1. Best Regards! 81948 [May 6 10:07:34] VERBOSE[11579] logger.c: -- Remote UNIX connection 81949 [May 6 10:07:51] VERBOSE[29627] logger.c: == New H.323 Connection created. 81950 [May 6 10:07:51] VERBOSE[29627] logger.c: --Received SETUP message 81951 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Setting up incoming call for ip$192.168.1.175:3584/90 81952 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Setting up Call 81953 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Call token: [ip$192.168.1.175:3584/90] 81954 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Calling party name: [72002] 81955 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Calling party number: [] 81956 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Called party name: [] 81957 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Called party number: [] 81958 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Calling party IP: [192.168.1.175] 81959 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Could not find user by name 72002 or address 192.168.1.175 81960 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Sending 72002 at 192.168.1.175 to context [h323-test] extensio n 81961 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Setting capabilities for connection ip$192.168.1.175:3584/9 0 81962 [May 6 10:07:51] VERBOSE[29627] logger.c: Setting capabilities to 0x4 (ulaw) 81963 [May 6 10:07:51] VERBOSE[29627] logger.c: Capabilities in preference order is (ulaw) 81964 [May 6 10:07:51] VERBOSE[29627] logger.c: Allowed Codecs: 81965 [May 6 10:07:51] VERBOSE[29627] logger.c: Table: 81966 [May 6 10:07:51] VERBOSE[29627] logger.c: G.711-uLaw-64k <1> 81967 [May 6 10:07:51] VERBOSE[29627] logger.c: UserInput/hookflash <2> 81968 [May 6 10:07:51] VERBOSE[29627] logger.c: UserInput/RFC2833 <3> 81969 [May 6 10:07:51] VERBOSE[29627] logger.c: UserInput/dtmf <4> 81970 [May 6 10:07:51] VERBOSE[29627] logger.c: Set: 81971 [May 6 10:07:51] VERBOSE[29627] logger.c: 0: 81972 [May 6 10:07:51] VERBOSE[29627] logger.c: 0: 81973 [May 6 10:07:51] VERBOSE[29627] logger.c: G.711-uLaw-64k <1> 81974 [May 6 10:07:51] VERBOSE[29627] logger.c: 1: 81975 [May 6 10:07:51] VERBOSE[29627] logger.c: UserInput/hookflash <2> 81976 [May 6 10:07:51] VERBOSE[29627] logger.c: 2: 81977 [May 6 10:07:51] VERBOSE[29627] logger.c: UserInput/RFC2833 <3> 81978 [May 6 10:07:51] VERBOSE[29627] logger.c: UserInput/dtmf <4> 81979 [May 6 10:07:51] VERBOSE[29627] logger.c: 81980 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Capabilities for connection ip$192.168.1.175:3584/90 is set 81981 [May 6 10:07:51] VERBOSE[29627] logger.c: =-= In OnAnswerCall for call 90 81982 [May 6 10:07:51] VERBOSE[29627] logger.c: - Progress Indicator: 0 81983 [May 6 10:07:51] VERBOSE[29627] logger.c: - Inserting PI of 0 into ALERTING message 81984 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Preparing Asterisk to answer for ip$192.168.1.175:3584/90 81985 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Going to extension s at h323-test because @h323-test isn't exi sts 81986 [May 6 10:07:51] VERBOSE[29645] logger.c: -- Executing [s at h323-test:1] Answer("H323/ip$192.168.1.1 75:3584/90", "") in new stack 81987 [May 6 10:07:51] DEBUG[29645] chan_h323.c: Answering on H323/ip$192.168.1.175:3584/90 81988 [May 6 10:07:51] VERBOSE[29645] logger.c: Answering call ip$192.168.1.175:3584/90 81989 [May 6 10:07:51] DEBUG[29645] chan_h323.c: OH323: Indicating -1 on ip$192.168.1.175:3584/90 81990 [May 6 10:07:51] DEBUG[29645] chan_h323.c: OH323: Indicated -1 on ip$192.168.1.175:3584/90, res=-1 81991 [May 6 10:07:51] VERBOSE[29645] logger.c: -- Executing [s at h323-test:2] Playback("H323/ip$192.168.1 .175:3584/90", "agent-login") in new stack 81992 [May 6 10:07:51] VERBOSE[29645] logger.c: -- <H323/ip$192.168.1.175:3584/90> Playing 'agent-login' (language 'en') 81993 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Received Facility message... 81994 [May 6 10:07:51] VERBOSE[29627] logger.c: Peer capability is G.711-uLaw-64k <1> 81995 [May 6 10:07:51] VERBOSE[29627] logger.c: Found peer capability G.711-uLaw-64k <1>, Asterisk code is 4 , frame size (in ms) is 20 81996 [May 6 10:07:51] VERBOSE[29627] logger.c: Peer capabilities 0x4 (ulaw), ordered list is (ulaw) 81997 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Got remote capabilities from connection ip$192.168.1.175:35 84/90 81998 [May 6 10:07:51] DEBUG[29627] chan_h323.c: prefs[0]=ulaw:20 81999 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Received Facility message... 82000 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Received Facility message... 82001 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Received Facility message... 82002 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Created RTP channel 82003 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Setting NAT on RTP to 0 82004 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Sending RTP 'US' 127.0.0.1:17380 82005 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Started logical channel: sending G.711-uLaw-64k 82006 [May 6 10:07:51] VERBOSE[29627] logger.c: -- channelsOpen = 1 82007 [May 6 10:07:51] VERBOSE[29627] logger.c: =-= In OnConnectionEstablished for call 90 82008 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Connection Established with "72002 [192.168.1.175]" 82009 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Call ip$192.168.1.175:3584/90 answered 82010 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Received Facility message... 82011 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Sending RTP 'US' 127.0.0.1:17380 82012 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Started logical channel: receiving G.711-uLaw-64k 82013 [May 6 10:07:51] VERBOSE[29627] logger.c: -- channelsOpen = 2 82014 [May 6 10:07:51] VERBOSE[29627] logger.c: External RTP Session Starting 82015 [May 6 10:07:51] VERBOSE[29627] logger.c: RTP channel id 1 parameters: 82016 [May 6 10:07:51] VERBOSE[29627] logger.c: -- remoteIpAddress: 192.168.1.175 82017 [May 6 10:07:51] VERBOSE[29627] logger.c: -- remotePort: 40000 82018 [May 6 10:07:51] VERBOSE[29627] logger.c: -- ExternalIpAddress: 127.0.0.1 82019 [May 6 10:07:51] VERBOSE[29627] logger.c: -- ExternalPort: 17380 82020 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Setting up RTP connection for ip$192.168.1.175:3584/90 82021 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Native format is set to 4 from 4 by RTP payload type 0 82022 [May 6 10:07:51] DEBUG[29627] chan_h323.c: RTP connection prepared for ip$192.168.1.175:3584/90 82023 [May 6 10:07:51] WARNING[29645] file.c: Unexpected control subclass '14' 82024 [May 6 10:07:51] DEBUG[29645] rtp.c: RTP Transmission error of packet 28354 to 192.168.1.175:40000: In valid argument 82025 [May 6 10:07:51] DEBUG[29645] rtp.c: RTP Transmission error of packet 28355 to 192.168.1.175:40000: In valid argument 82026 [May 6 10:07:51] VERBOSE[29627] logger.c: -- Received Facility message... 82027 [May 6 10:07:51] VERBOSE[29627] logger.c: MyH323_ExternalRTPChannel::OnReceivedAckPDU 82028 [May 6 10:07:51] VERBOSE[29627] logger.c: -- remoteIpAddress: 192.168.1.175 82029 [May 6 10:07:51] VERBOSE[29627] logger.c: -- remotePort: 40000 82030 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Setting up RTP connection for ip$192.168.1.175:3584/90 82031 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Native format is set to 4 from 4 by RTP payload type 0 82032 [May 6 10:07:51] DEBUG[29627] chan_h323.c: RTP connection prepared for ip$192.168.1.175:3584/90 82033 [May 6 10:07:51] VERBOSE[29627] logger.c: External RTP Session Starting 82034 [May 6 10:07:51] VERBOSE[29627] logger.c: RTP channel id 1 parameters: 82035 [May 6 10:07:51] VERBOSE[29627] logger.c: -- remoteIpAddress: 192.168.1.175 82036 [May 6 10:07:51] VERBOSE[29627] logger.c: -- remotePort: 40000 82037 [May 6 10:07:51] VERBOSE[29627] logger.c: -- ExternalIpAddress: 127.0.0.1 82038 [May 6 10:07:51] VERBOSE[29627] logger.c: -- ExternalPort: 17380 82039 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Setting up RTP connection for ip$192.168.1.175:3584/90 82040 [May 6 10:07:51] DEBUG[29627] chan_h323.c: Native format is set to 4 from 4 by RTP payload type 0 82041 [May 6 10:07:51] DEBUG[29627] chan_h323.c: RTP connection prepared for ip$192.168.1.175:3584/90 82042 [May 6 10:07:51] WARNING[29645] file.c: Unexpected control subclass '14' 82043 [May 6 10:07:51] WARNING[29645] file.c: Unexpected control subclass '14' 82044 [May 6 10:07:51] DEBUG[29645] rtp.c: RTP Transmission error of packet 28356 to 192.168.1.175:40000: In valid argument 82045 [May 6 10:07:51] DEBUG[29645] rtp.c: RTP Transmission error of packet 28357 to 192.168.1.175:40000: In valid argument 82046 [May 6 10:07:51] DEBUG[29645] rtp.c: RTP Transmission error of packet 28358 to 192.168.1.175:40000: In valid argument 82047 [May 6 10:07:51] DEBUG[29645] rtp.c: RTP Transmission error of packet 28359 to 192.168.1.175:40000: In valid argument 82048 [May 6 10:07:51] DEBUG[29645] rtp.c: RTP Transmission error of packet 28360 to 192.168.1.175:40000: In valid argument 82049 [May 6 10:07:51] DEBUG[29645] rtp.c: RTP Transmission error of packet 28361 to 192.168.1.175:40000: In valid argument 82050 [May 6 10:07:51] DEBUG[29645] rtp.c: RTP Transmission error of packet 28362 to 192.168.1.175:40000: In valid argument ....