[Asterisk-Users] Duplicate Calls

[VoIP Newbie]

I am using Asterisk CVS-HEAD-06/02/05-19:37:27. It seems that every
call I made was duplicate.

Jun  8 00:11:30 DEBUG[21733]: chan_h323.c:411 oh323_call: Placing
outgoing call to 87874586, 101
    -- Called 87874586
Jun  8 00:11:31 DEBUG[21733]: rtp.c:472 ast_rtp_read: RTP NAT: Using
address 10.17.43.53:8000
Jun  8 00:11:32 DEBUG[21735]: chan_h323.c:1218 progress: Received
ALERT/PROGRESS message for self-generated tones
    -- H323/87874586-11 is ringing
Jun  8 00:11:32 DEBUG[21733]: channel.c:1562 ast_indicate: Driver for
channel 'SIP/6817-6399' does not support indication 3, emulating it
Jun  8 00:11:32 DEBUG[21733]: channel.c:1681 ast_prod: Prodding
channel 'SIP/6817-6399'
    -- H323/87874586-11 is ringing
    -- H323/87874586-11 answered SIP/6817-6399
Jun  8 00:11:38 DEBUG[21733]: channel.c:1489 ast_read: Dropping
duplicate answer!
Jun  8 00:11:38 DEBUG[21524]: chan_sip.c:1015 __sip_ack: Stopping
retransmission on 'E6859B2C-37BB-4F1D-8ADC-7AAB0FA3DCC7 at 192.168.1.13'
of Response 41001: Found

Any advice???