Hello I have about 100 phones in lan. Every phone have set rtp port to 20000 (very simple phone 8Level you can set one rtp port not range like linsys can) my logs in freeswithc looks: 2009-05-27 17:51:10 [INFO] mod_dialplan_xml.c:252 dialplan_hunt() Processing 101->166 in context default 2009-05-27 17:51:10 [NOTICE] mod_dptools.c:1274 system_session_function() Executing command: mkdir -p /records/2009-05-27 2009-05-27 17:51:10 [INFO] switch_core_session.c:1391 switch_core_session_execute_application() Sending early media 2009-05-27 17:51:10 [INFO] mod_sofia.c:1448 sofia_receive_message() Ring SDP: v=0 o=FreeSWITCH 1243416430 1243416431 IN IP4 192.168.1.1 s=FreeSWITCH c=IN IP4 192.168.1.1 t=0 0 m=audio 23040 RTP/AVP 0 101 a=rtpmap:0 PCMU/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=silenceSupp:off - - - - a=ptime:30 a=sendrecv 2009-05-27 17:51:10 [NOTICE] mod_sofia.c:1451 sofia_receive_message() Pre-Answer sofia/internal/101@192.168.1.1! 2009-05-27 17:51:10 [NOTICE] switch_channel.c:602 switch_channel_set_name() New Channel sofia/internal/sip:166@192.168.1.166:5060;fs_nat=yes;fs_path=sip%3A166%40192.168.1.166%3A5060 [32e3b290-4ad6-11de-981e-f9f8384b4b12] 2009-05-27 17:51:10 [NOTICE] sofia.c:3101 sofia_handle_sip_i_state() Ring-Ready sofia/internal/sip:166@192.168.1.166:5060;fs_nat=yes;fs_path=sip%3A166%40192.168.1.166%3A5060! 2009-05-27 17:51:10 [INFO] switch_rtp.c:1800 rtp_common_read() Auto Changing port from 192.168.1.101:16384 to 192.168.1.101:1045 Phone has set rtp port to 16384 but freeswitch changes to 1045 (rtp range on freeswitch is default from 16384 to 32768). Why has it change to 1045 There isn't any firewall on this server Can be a problem if every phone in net has set in his config the same rtp port ? freeSwitch ver: FreeSWITCH Version 1.0.trunk (13430) linux: Linux pbx 2.6.24-23-server #1 SMP Mon Jan 26 00:55:21 UTC 2009 i686 GNU/Linux Thanks