I have set up a FS behind a NAT. Calling internal numbers, VM etc. works from a different network (Caller's phone is also natted). However if I call an external Gateway the call is terminated as soon as the remote party lifts the handset. And Freeswitch is delivering "SIP/2.0 500 Cannot Get IP Address for Media" to the caller and then sends a BYE. I can see that RTP packets are coming in from the external gateway from port 26726 and they are sent to the callers phone before hangup, but no RTP packets are coming from the callers phone and are send to the external gateway. But as I mentionned, calling internal number from this phone works. Also the gateway works from another FS installation. But what does this message mean in detail? Does he complain about the IP adress of the caller or about the IP of the getaway, or does he complain that he may not reach a certain port for the media? Best regards Peter Here's the part of the FS log ==================== 2008-11-21 20:49:27 [DEBUG] sofia.c:2318 sofia_handle_sip_i_state() Channel sofia/external/06XX16XXXX3@sip.qsc.de entering state [proceeding] 2008-11-21 20:49:27 [DEBUG] switch_ivr_bridge.c:292 audio_bridge_thread() sofia/internal/1000@my.domain.com receive message [SWITCH_MESSAGE_INDICATE_RINGING] 2008-11-21 20:49:27 [DEBUG] switch_core_session.c:489 switch_core_session_perform_receive_message() Send signal sofia/internal/1000@my.domain.com [BREAK] 2008-11-21 20:49:30 [DEBUG] sofia.c:2318 sofia_handle_sip_i_state() Channel sofia/external/06XX16XXXX3@sip.qsc.de entering state [ready] 2008-11-21 20:49:30 [DEBUG] switch_channel.c:1657 switch_channel_perform_mark_answered() Send signal sofia/internal/1000@my.domain.com [BREAK] 2008-11-21 20:49:30 [NOTICE] sofia.c:2741 sofia_handle_sip_i_state() Channel [sofia/external/06XX16XXXX3@sip.qsc.de] has been answered 2008-11-21 20:49:30 [DEBUG] switch_channel.c:1712 switch_channel_perform_answer() sofia/internal/1000@my.domain.com receive message [SWITCH_MESSAGE_INDICATE_ANSWER] 2008-11-21 20:49:30 [DEBUG] mod_sofia.c:502 sofia_answer_channel() Local SDP sofia/internal/1000@my.domain.com: v=0 o=FreeSWITCH 1227284490 1227284492 IN IP4 my.domain.com s=FreeSWITCH c=IN IP4 my.domain.com t=0 0 m=audio 12476 RTP/AVP 8 101 a=rtpmap:8 pcma/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=silenceSupp:off - - - - a=ptime:20 a=sendrecv 2008-11-21 20:49:30 [DEBUG] switch_core_session.c:489 switch_core_session_perform_receive_message() Send signal sofia/internal/1000@my.domain.com [BREAK] 2008-11-21 20:49:30 [DEBUG] sofia.c:2318 sofia_handle_sip_i_state() Channel sofia/internal/1000@my.domain.com entering state [terminated] 2008-11-21 20:49:30 [NOTICE] sofia.c:2857 sofia_handle_sip_i_state() Hangup sofia/internal/1000@my.domain.com [CS_EXECUTE] [NORMAL_TEMPORARY_FAILURE] 2008-11-21 20:49:30 [NOTICE] switch_ivr_bridge.c:303 audio_bridge_thread() Channel [sofia/internal/1000@my.domain.com] has been answered 2008-11-21 20:49:30 [DEBUG] switch_channel.c:1441 switch_channel_perform_hangup() Send signal sofia/internal/1000@my.domain.com [KILL] 2008-11-21 20:49:30 [DEBUG] switch_core_session.c:779 switch_core_session_signal_state_change() Send signal sofia/internal/1000@my.domain.com [BREAK] 2008-11-21 20:49:30 [DEBUG] switch_ivr_bridge.c:361 audio_bridge_thread() sofia/internal/1000@my.domain.com ending bridge by request from read function 2008-11-21 20:49:30 [DEBUG] switch_ivr_bridge.c:436 audio_bridge_thread() BRIDGE THREAD DONE [sofia/internal/1000@my.domain.com] 2008-11-21 20:49:30 [DEBUG] switch_ivr_bridge.c:440 audio_bridge_thread() Send signal sofia/external/06XX16XXXX3@sip.qsc.de [BREAK] 2008-11-21 20:49:30 [DEBUG] switch_ivr_bridge.c:913 switch_ivr_multi_threaded_bridge() (sofia/external/06XX16XXXX3@sip.qsc.de) State Change CS_EXCHANGE_MEDIA -> CS_RESET 2008-11-21 20:49:30 [DEBUG] switch_core_session.c:779 switch_core_session_signal_state_change() Send signal sofia/external/06XX16XXXX3@sip.qsc.de [BREAK] 2008-11-21 20:49:30 [DEBUG] switch_core_state_machine.c:433 switch_core_session_run() (sofia/internal/1000@my.domain.com) State EXECUTE going to sleep 2008-11-21 20:49:30 [DEBUG] switch_core_state_machine.c:375 switch_core_session_run() (sofia/internal/1000@my.domain.com) Running State Change CS_HANGUP 2008-11-21 20:49:30 [DEBUG] switch_core_state_machine.c:403 switch_core_session_run() (sofia/internal/1000@my.domain.com) State HANGUP 2008-11-21 20:49:30 [DEBUG] mod_sofia.c:287 sofia_on_hangup() Channel sofia/internal/1000@my.domain.com hanging up, cause: NORMAL_TEMPORARY_FAILURE 2008-11-21 20:49:30 [DEBUG] switch_core_state_machine.c:46 switch_core_standard_on_hangup() sofia/internal/1000@my.domain.com Standard HANGUP, cause: NORMAL_TEMPORARY_FAILURE 2008-11-21 20:49:30 [DEBUG] switch_core_state_machine.c:403 switch_core_session_run() (sofia/internal/1000@my.domain.com) State HANGUP going to sleep 2008-11-21 20:49:30 [DEBUG] switch_core_session.c:911 switch_core_session_thread() Session 15 (sofia/internal/1000@my.domain.com) Locked, Waiting on external entities 2008-11-21 20:49:30 [DEBUG] switch_ivr_bridge.c:410 audio_bridge_thread() sofia/external/06XX16XXXX3@sip.qsc.de receive message [SWITCH_MESSAGE_INDICATE_UNBRIDGE] 2008-11-21 20:49:30 [DEBUG] switch_core_session.c:489 switch_core_session_perform_receive_message() Send signal sofia/external/06XX16XXXX3@sip.qsc.de [BREAK] 2008-11-21 20:49:30 [DEBUG] switch_ivr_bridge.c:436 audio_bridge_thread() BRIDGE THREAD DONE [sofia/external/06XX16XXXX3@sip.qsc.de] 2008-11-21 20:49:30 [DEBUG] switch_ivr_bridge.c:440 audio_bridge_thread() Send signal sofia/internal/1000@my.domain.com [BREAK] 2008-11-21 20:49:30 [NOTICE] switch_ivr_bridge.c:472 audio_bridge_on_exchange_media() Hangup sofia/external/06XX16XXXX3@sip.qsc.de [CS_RESET] [NORMAL_CLEARING] 2008-11-21 20:49:30 [DEBUG] switch_channel.c:1441 switch_channel_perform_hangup() Send signal sofia/external/06XX16XXXX3@sip.qsc.de [KILL] 2008-11-21 20:49:30 [DEBUG] switch_core_session.c:779 switch_core_session_signal_state_change() Send signal sofia/external/06XX16XXXX3@sip.qsc.de [BREAK] 2008-11-21 20:49:30 [NOTICE] switch_core_session.c:929 switch_core_session_thread() Session 15 (sofia/internal/1000@my.domain.com) Ended 2008-11-21 20:49:30 [NOTICE] switch_core_session.c:931 switch_core_session_thread() Close Channel sofia/internal/1000@my.domain.com [CS_HANGUP] 2008-11-21 20:49:30 [DEBUG] switch_core_state_machine.c:436 switch_core_session_run() (sofia/external/06XX16XXXX3@sip.qsc.de) State EXCHANGE_MEDIA going to sleep 2008-11-21 20:49:30 [DEBUG] switch_core_state_machine.c:375 switch_core_session_run() (sofia/external/06XX16XXXX3@sip.qsc.de) Running State Change CS_HANGUP 2008-11-21 20:49:30 [DEBUG] switch_core_state_machine.c:403 switch_core_session_run() (sofia/external/06XX16XXXX3@sip.qsc.de) State HANGUP 2008-11-21 20:49:30 [DEBUG] mod_sofia.c:253 sofia_on_hangup() sofia/external/06XX16XXXX3@sip.qsc.de Overriding SIP cause 480 with 500 from the other leg 2008-11-21 20:49:30 [DEBUG] mod_sofia.c:287 sofia_on_hangup() Channel sofia/external/06XX16XXXX3@sip.qsc.de hanging up, cause: NORMAL_CLEARING 2008-11-21 20:49:30 [DEBUG] mod_sofia.c:344 sofia_on_hangup() Sending BYE to sofia/external/06XX16XXXX3@sip.qsc.de 2008-11-21 20:49:30 [DEBUG] switch_core_state_machine.c:46 switch_core_standard_on_hangup() sofia/external/06XX16XXXX3@sip.qsc.de Standard HANGUP, cause: NORMAL_CLEARING 2008-11-21 20:49:30 [DEBUG] switch_core_state_machine.c:403 switch_core_session_run() (sofia/external/06XX16XXXX3@sip.qsc.de) State HANGUP going to sleep 2008-11-21 20:49:30 [DEBUG] switch_core_session.c:911 switch_core_session_thread() Session 16 (sofia/external/06XX16XXXX3@sip.qsc.de) Locked, Waiting on external entities 2008-11-21 20:49:30 [NOTICE] switch_core_session.c:929 switch_core_session_thread() Session 16 (sofia/external/06XX16XXXX3@sip.qsc.de) Ended 2008-11-21 20:49:30 [NOTICE] switch_core_session.c:931 switch_core_session_thread() Close Channel sofia/external/06XX16XXXX3@sip.qsc.de [CS_HANGUP] Network-Scan on the FS machine: =========================================== U 213.148.136.2:5060 -> 10.101.0.201:5080 SIP/2.0 180 Ringing. Via: SIP/2.0/UDP 195.xxx.xxx.2xx:5080;branch=z9hG4bKZ0pFrtcctSS4m;rport=5080. Call-ID: 1820daf3-325d-122c-e4a8-001d096ac1c9. From: "Extension 1000"<sip:07141xxxxxx@sip.qsc.de;transport=udp>;tag=pevpy0DUNSQpS. To: <sip:06XX16XXXX3@sip.qsc.de>;tag=207dc7d8. CSeq: 107513988 INVITE. Allow: INVITE,ACK,OPTIONS,BYE,CANCEL,REGISTER,INFO,PRACK,SUBSCRIBE,NOTIFY,UPDATE,MESSAGE,REFER. Contact: <sip:213.148.136.2:5060;user=phone>. Content-Length: 0. . # U 213.148.136.2:5060 -> 10.101.0.201:5080 SIP/2.0 200 OK. Via: SIP/2.0/UDP 195.xxx.xxx.2xx:5080;branch=z9hG4bKZ0pFrtcctSS4m;rport=5080. Call-ID: 1820daf3-325d-122c-e4a8-001d096ac1c9. From: "Extension 1000"<sip:07141xxxxxx@sip.qsc.de;transport=udp>;tag=pevpy0DUNSQpS. To: <sip:06XX16XXXX3@sip.qsc.de>;tag=207dc7d8. CSeq: 107513988 INVITE. Allow: INVITE,ACK,OPTIONS,BYE,CANCEL,REGISTER,INFO,PRACK,SUBSCRIBE,NOTIFY,UPDATE,MESSAGE,REFER. Supported: 100rel,replaces,timer,precondition,histinfo. Contact: <sip:213.148.136.2:5060;user=phone>. Content-Length: 221. Content-Type: application/sdp. . v=0. o=HuaweiSoftX3000 10118984 10118985 IN IP4 213.148.136.2. s=Sip Call. c=IN IP4 213.148.136.2. t=0 0. m=audio 26726 RTP/AVP 8 101. a=rtpmap:8 PCMA/8000. a=rtpmap:101 telephone-event/8000. a=ptime:20. a=fmtp:101 0-15. # U 10.101.0.201:5080 -> 213.148.136.2:5060 ACK sip:213.148.136.2:5060;user=phone SIP/2.0. Via: SIP/2.0/UDP 195.xxx.xxx.2xx:5080;rport;branch=z9hG4bK09F8SNXFQ2FQg. Max-Forwards: 70. From: "Extension 1000" <sip:07141xxxxxx@sip.qsc.de;transport=udp>;tag=pevpy0DUNSQpS. To: <sip:06XX16XXXX3@sip.qsc.de>;tag=207dc7d8. Call-ID: 1820daf3-325d-122c-e4a8-001d096ac1c9. CSeq: 107513988 ACK. Contact: <sip:07141xxxxxx@195.xxx.xxx.2xx:5080;transport=udp>. Proxy-Authorization: Digest username="07141xxxxxx", realm="qsc.de", nonce="492693bf3670f4927f1ad7f6310fb22b65e10c17", cnonce="GCLZVTJdEiyo5AAdCWrByQ", algorithm=MD5, uri="sip:06XX16XXXX3@sip.qsc.de", response="79c35e38c30eb7c25a92f9b90526abd5", qop=auth, nc=00000001. Content-Length: 0. . # U 10.101.0.201:5060 -> 217.XX.XX.189:2048 *SIP/2.0 500 Cannot Get IP Address for Media.* Via: SIP/2.0/UDP 217.XX.XX.189:2048;branch=z9hG4bK-kgkuy3yyoq8a;rport=2048. From: "1000" <sip:1000@my.domain.com>;tag=44eejmbuny. To: <sip:06XX16XXXX3@my.domain.com;user=phone>;tag=56v0XXNSBSHNc. Call-ID: 3c2718517d92-pifrb7rpiz4f. CSeq: 2 INVITE. Contact: <sip:mod_sofia@my.domain.com:5060;transport=udp>. User-Agent: FreeSWITCH-mod_sofia/1.0.trunk-10438. Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO. Supported: timer, precondition, path, replaces. Allow-Events: talk. Content-Length: 0.