[Serusers] Re: NAT problem
Nils Ohlmeier
lists at ohlmeier.org
Sat Jun 25 16:42:43 CEST 2005
Hi Bernd,
I guess you use snom UA's with more or less recent firmwares. These UA's do
not accept incoming TCP connections any more. SER tries to open new TCP
connections to the UA, which is rejected. Thus it ends up with an transport
error.
I'm not very familiar with it, but you could have more luck if you play around
with the tcp_accept_aliases and other tcp_*_aliases parameters on your SER.
Regards
Nils
On Saturday 25 June 2005 11:12, Bernd Froemel wrote:
> I could fix some of my problems by using a proper conntrack kernel
> module in my router - now the phones behind the same NAT remain
> reachable; at least as long as there is no server restart or one of the
> phones goes offline and online again without doing a unregister.
>
> Still a lot of
>
> er[27588]: ERROR: tcp_blocking_connect: SO_ERROR (111) Connection
>
> > refused
> > ser[27588]: ERROR: tcpconn_connect: tcp_blocking_connect failed
> > ser[27588]: ERROR: tcp_send: connect failed
> > ser[27588]: msg_send: ERROR: tcp_send failed
> > ser[27588]: ERROR: t_forward_nonack: sending request failed
>
> errors (especially on bye/cancel/acks which results in failure to detect
> call terminations) while t_relay is issued.
>
> Anyone has an idea/pointer whats wrong here?
>
> There is another problem with my INVITEs - for some reason they don't
> get a 'Route:' header added; as it maybe is supposed to be.
>
> > #if (uri=~"[@:](192\.168\.|10\.|172\.(1[6-9]|2[0-9]|3[0-1])\.)" && !
> > search("^Route:"))
> > #{
> > # sl_send_reply("479", "forward request to private ip address denied");
> > # break;
> > #};
>
> Could anybody please post me a correct INVITE to CANCEL/BYE session with
> two phones behind the same nat?
>
> Thanks in advance,
> Bernd
>
> On Thu, 2005-06-23 at 13:15 +0200, Bernd Froemel wrote:
> > Dear list,
> >
> > I have some wired problem between users behind the same NAT connected to
> > a multihomed ser server (public&private IP). Ser is listening only on
> > the public interface (ser.ip.address). The NATed clients have
> > official.ip.address as their official IP address and 192.168.10.1 and
> > 192.168.10.2 are their IP addresses behind NAT.
> >
> > Now after a register I get for the NATed clients the following entries
> > into the location table:
> >
> > UA1:
> > contact: sip:test at 192.168.10.1:2050;transport=tcp;line=1hzwxw3z
> > received: sip:official.ip.address:2050;transport=TCP
> > flags: 1
> >
> > UA2:
> > contact: sip:test2 at 192.168.10.2:2050;transport=tcp;line=1hzwxw3z
> > received: sip:official.ip.address:2050;transport=TCP
> > flags: 1
> >
> > which looks quite good (why is the flag 1 and not 6?), but then on
> > INVITE/SUBSCRIBE/ (everthing which issues a t_relay) my logs get full
> > of:
> >
> > ser[27588]: ERROR: tcp_blocking_connect: SO_ERROR (111) Connection
> > refused
> > ser[27588]: ERROR: tcpconn_connect: tcp_blocking_connect failed
> > ser[27588]: ERROR: tcp_send: connect failed
> > ser[27588]: msg_send: ERROR: tcp_send failed
> > ser[27588]: ERROR: t_forward_nonack: sending request failed
> >
> > and the UA which issued the command receives a: 477 Unfortunately error
> > on sending to next hop occurred message.
> >
> > I think it has something to do with the lookup of the target UA - at
> > least I always get the uri back which contains the private IP.
> > (debugging output:
> >
> > befor lookup 80.123.216.181 - - sip:test at domain.com
> > after lookup 80.123.216.181 - -
> > sip:test at 192.168.10.1:2050;transport=tcp;line=lhzwxw3z
> > )
> >
> > Also I guess that the commented part which is uncommented in the default
> > cfg shouldn't prevent all NAT calls, but only calls to real private IPs.
> >
> > ( found in route[1] beginning, the nat route)
> >
> > #if (uri=~"[@:](192\.168\.|10\.|172\.(1[6-9]|2[0-9]|3[0-1])\.)" && !
> > search("^Route:"))
> > #{
> > # sl_send_reply("479", "forward request to private ip address denied");
> > # break;
> > #};
> > )
> >
> > But to due the lookup returning me a private IP uri this would result in
> > a 479 error.
> >
> > My current test config is basically the one found in cvs/etc/ser.cfg.m4
> > with inserted values. I already tried other cfgs - even the example in
> > modules/nathelper -- no success. Yes rtpproxy is running, I can even
> > call the other UA and audio is working full duplex, but only at the very
> > beginning. After a few minutes idleing or a server restart, without
> > clearing the sql location table a call results always in the 477 error.
> >
> >
> > Please help me - what am I missing here?
> >
> > Thanks in advance,
> > Bernd
> >
> > -----
> > Here my cfg and some SIP messages during REGISTER and INVITE
> > (I have removed IPs and unnecessary parts, Asterisk gw is
> > 192.168.xx.xx):
> >
> > #
> > # ----------- global configuration parameters ------------------------
> >
> > [...]
> >
> > check_via=no # (cmd. line: -v)
> > dns=yes # (cmd. line: -r)
> > rev_dns=no # (cmd. line: -R)
> > mhomed=1
> >
> > [...]
> >
> >
> > # ------------------ module loading ----------------------------------
> >
> > [...]
> >
> > # ----------------- setting module-specific parameters ---------------
> >
> > [...]
> >
> >
> > modparam("nathelper", "natping_interval", 15)
> > modparam("nathelper", "ping_nated_only", 1)
> > modparam("nathelper", "rtpproxy_sock", "unix:/var/run/rtpproxy.sock")
> >
> > modparam("registrar", "nat_flag", 6)
> > modparam("registrar", "use_domain", 1)
> >
> > modparam("acc", "report_ack", 1)
> > modparam("acc", "log_level", 1)
> > #if BYE fails (telephone is dead, record-routing broken, etc.), generate
> > #a report nevertheless -- otherwise we would have no STOP event; => 1
> > modparam("acc", "failed_transactions", 1)
> >
> > modparam("acc", "log_flag", 1)
> > modparam("acc", "db_flag", 1)
> > modparam("acc", "log_missed_flag", 3)
> > modparam("acc", "db_missed_flag", 3)
> >
> >
> >
> > modparam("usrloc", "db_mode", 0)
> > modparam("usrloc", "db_mode", 2)
> > modparam("usrloc", "use_domain", 1)
> > modparam("usrloc", "timer_interval", 10)
> >
> > modparam("auth_db", "calculate_ha1", yes)
> > modparam("auth_db", "password_column", "password")
> > modparam("auth", "nonce_expire", 300)
> >
> > modparam("rr", "enable_full_lr", 1)
> >
> > modparam("tm", "fr_timer", 20)
> > modparam("tm", "fr_inv_timer", 90)
> > modparam("tm", "wt_timer", 20)
> >
> > #modparam("enum", "domain_suffix", "e164.arpa.")
> >
> > modparam("msilo", "registrar", "sip:registrar at xxxxxxxx")
> >
> > alias=domain1.com
> > alias=domain2.com
> >
> > /*
> > flags:
> > 1 ... ACCOUNT
> > 3 ... MISSED CALLS
> > 4 ... VOICEMAIL
> > 6 ... NAT
> > */
> >
> > # ------------------------- request routing logic -------------------
> >
> > # main routing logic
> >
> > route
> > {
> > # initial sanity checks -- messages with
> > # max_forwards==0, or excessively long requests
> > if (!mf_process_maxfwd_header("10"))
> > {
> > sl_send_reply("483","too many hops (loop?)");
> > break;
> > };
> > if (msg:len >= 2048 )
> > {
> > sl_send_reply("513", "message too large");
> > break;
> > };
> >
> > if (nat_uac_test("3"))
> > {
> > if (method=="REGISTER" || !search("^Record-Route:"))
> > {
> > if (method=="REGISTER")
> > {
> > fix_nated_register();
> > } else
> > {
> > fix_nated_contact();
> > };
> > if (method=="INVITE")
> > {
> > log(1,"natted caller sent invite!\n");
> > fix_nated_sdp("1");
> > };
> > force_rport();
> > setflag(6);
> > log(1, "natted caller detected\n");
> > append_to_reply("P-NATed-Caller: Yes\r\n");
> > } else
> > {
> > log(1, "something wrong here..\n");
> > };
> > };
> >
> >
> > #antispam
> >
> > if ( search("(From|F):.*@(domain1\.com)|(domain2\.com)|(192\.168\.xx
> > \.xx)") )
> > {
> > if ( (method=="INVITE" || method=="SUBSCRIBE") && !(src_ip == SER_IP
> >
> > || src_ip == 192.168.xx.xx) )
> >
> > {
> > if (!(proxy_authorize("","subscriber")))
> > {
> > proxy_challenge("","0");
> > break;
> > };
> > if (!check_from())
> > {
> > log("LOG: From Cheating attempt in INVITE!\n");
> > sl_send_reply("403", "use From=id");
> > break;
> > };
> > #consume_credentials();
> > }; #non-REGISTER from other domain
> > } else if ((method=="INVITE" || method=="SUBSCRIBE" ||
> > method=="REGISTER") && !(uri==myself || uri=~"(@(192\.168\.xx
> > \.xx)([;:].*)*)") )
> > {
> > sl_send_reply("403", "no relaying");
> > break;
> > };
> >
> > if (!(method=="REGISTER"))
> > {
> > record_route();
> > };
> >
> > #if (method=="BYE" || method=="CANCEL")
> > #{
> > # unforce_rtp_proxy();
> > #};
> >
> >
> >
> > # subsequent messages withing a dialog should take the
> > # path determined by record-routing
> > if (loose_route()) {
> > if ((method=="INVITE" || method=="ACK" || method=="CANCEL") &&
> > uri=~"(@(192\.168\.xx\.xx)([;:].*)*)")
> > {
> > route(4); # to asterisk
> > }
> > else
> > {
> > append_hf("P-hint: rr-enforced\r\n");
> > if (method=="BYE")
> > {
> > setflag(1);
> > };
> > log(1, "and directly to nat..\n");
> > route(1); # to nat
> > };
> > break;
> > };
> >
> > if (!(uri==myself || uri=~"(@(192\.168\.xx\.xx)([;:].*)*)"))
> > {
> > # mark routing logic in request
> > append_hf("P-hint: outbound\r\n");
> > log(1, "outbound\n");
> > route(1); # to nat
> > break;
> > };
> >
> > # ---->request is for our domains!<---- #
> >
> > if (method=="REGISTER")
> > {
> > if (!www_authorize("","subscriber"))
> > {
> > www_challenge("","0");
> > break;
> > };
> > if (!check_to())
> > {
> > log("LOG: To Cheating attempt\n");
> > sl_send_reply("403", "use From=id");
> > break;
> > };
> > log(1, "(un)register successful\n");
> > if (!save("location"))
> > {
> > sl_reply_error();
> > };
> > m_dump();
> > break;
> > };
> >
> > if (uri=~"sip:daemon@")
> > {
> > sl_send_reply("410", "daemon is gone");
> > break;
> > };
> >
> > lookup("aliases");
> >
> > if (!(uri==myself || uri=~"(@(192\.168\.xx\.xx)([;:].*)*)"))
> > {
> > append_hf("P-hint: ALIASED-OUTBOUND\r\n");
> > route(1); #to nat
> > break;
> > };
> >
> > if (uri=~"^[a-zA-Z]+:\+[0-9]+@")
> > {
> > strip(1);
> > prefix("00");
> > };
> >
> > if (!does_uri_exist())
> > {
> > if(uri=~"^[a-zA-Z]+:[0-9]+@")
> > {
> > route(4); #to pstn
> > }
> > else
> > {
> > sl_send_reply("604", "does not exist anywhere");
> > };
> > break;
> > };
> >
> > if (is_user_in("Request-URI", "voicemail"))
> > {
> > setflag(4);
> > };
> >
> > exec_msg("echo befor lookup $SIP_SRCIP - $SIP_ORURI - $SIP_RURI
> >
> > >> /tmp/ser.log");
> >
> > if (!lookup("location"))
> > {
> > log(1, "lookup failed\n");
> > route(6);
> > break;
> > } else
> > {
> > log(1, "lookup successful\n");
> > };
> > exec_msg("echo after lookup $SIP_SRCIP - $SIP_ORURI - $SIP_RURI
> >
> > >> /tmp/ser.log");
> >
> > if (uri=~"(@(192\.168\.xx\.xx)([;:].*)*)")
> > {
> > log(1, "LOG: Gateway address in UsrLoc!\n");
> > route(4); # to PSTN
> > break;
> > };
> >
> > if (method=="INVITE" && isflagset(4))
> > {
> > t_on_failure("1");
> > };
> >
> > setflag(3);
> >
> > append_hf("P-hint: USRLOC\r\n");
> > log(1, "nearly at end and going to nat..\n");
> > exec_msg("echo $SIP_SRCIP - $SIP_ORURI - $SIP_RURI >> /tmp/ser.log");
> > route(1); # to nat
> > }
> >
> > route[1]
> > {
> >
> > #if (uri=~"[@:](192\.168\.|10\.|172\.(1[6-9]|2[0-9]|3[0-1])\.)" && !
> > search("^Route:"))
> > #{
> > # sl_send_reply("479", "forward request to private ip address denied");
> > # break;
> > #};
> >
> > if (isflagset(6))
> > {
> > if(!is_present_hf("P-RTP-Proxy"))
> > {
> > force_rtp_proxy();
> > append_hf("P-RTP-Proxy: Yes\r\n");
> > log(1, "rtp proxied\n");
> > };
> > log(1,"natted calee\n");
> > append_hf("P=NATed-Calee: Yes\r\n");
> > };
> > exec_msg("echo :: $SIP_SRCIP - $SIP_ORURI - $SIP_RURI
> >
> > >> /tmp/ser.log");
> >
> > log(1, "1\n");
> > t_on_reply("1");
> > log(1, "2\n");
> > if (!t_relay()) {
> > sl_reply_error();
> > break;
> > };
> > log(1, "3\n");
> > }
> >
> >
> > route[4]
> > {
> > [...]
> > }
> >
> > onreply_route[1]
> > {
> > log(1, "taking onreply route\n");
> > if(isflagset(6) && status=~"(183)|2[0-9][0-9]" &&
> > !search("^Content-Length:\ +0"))
> > {
> > log(1,"onreply fixing nat\n");
> > fix_nated_contact();
> > force_rtp_proxy();
> > } else if (nat_uac_test("1"))
> > {
> > log (1, "onreply fixing nat alternate\n");
> > fix_nated_contact();
> > };
> > }
> >
> > route[4]
> > {
> > [...]
> > }
> >
> > route[6]
> > {
> > [...]
> > }
> >
> >
> > -----------
> > REGISTER
> > -----------
> > T official.ip.address:2062 -> ser.ip.address:5060 [A]
> > REGISTER sip:domain.com SIP/2.0..Via: SIP/2.0/TCP 192.168.10.1:2062;br
> > anch=z9hG4bK-wekq229vr3vn;rport..From: "Test"
> > <sip:test at domain.com>;tag=3q2blh64wf..To: "Test"
> > <sip:test at domain.com>..Call-ID: 3c26818830d4-ugwagbaz5vkz at snom360..CSeq:
> > 22 REGISTER..Max-
> > Forwards: 70..Contact: <sip:test at 192.168.10.1:2062;transport=tcp;line=
> > lhzwxw3z>;q=1.0;
> > +sip.instance="<urn:uuid:0c541696-09aa-4d0c-b8ca-fb9889cc61ad>"
> > ;audio;mobility="fixed";duplex="full";description="snom360";actor="princi
> >pal"; events="dialog";methods="INVITE,ACK,CANCEL,BYE,REFER,OPTIONS,NOTIFY
> > ,SUBSCRIBE,PRACK,MESSAGE,INFO"..User-Agent: snom360/3.60k..Supported:
> > gruu.
> > .Allow-Events: dialog..X-Real-IP: 192.168.0.191..WWW-Contact:
> > <http://192.168.10.1:80>..WWW-Contact:
> > <https://192.168.10.1:443>..Expires: 3600..Content-Length: 0
> >
> > T ser.ip.address:5060 -> official.ip.address:2062 [AP]
> > SIP/2.0 401 Unauthorized..Via: SIP/2.0/TCP
> > 192.168.10.1:2062;branch=z9hG4b
> > K-wekq229vr3vn;rport=2062;received=official.ip.address..From: "Test"
> > <sip:test at domain.com>;tag=3q2blh64wf..To: "Test" <sip:
> > test at domain.com>;tag=5431d75005d8ed216f7c100a44746400.19d5..Call-ID
> >
> > : 3c26818830d4-ugwagbaz5vkz at snom360..CSeq: 22
> >
> > REGISTER..P-NATed-Caller: Yes
> > ..WWW-Authenticate: Digest realm="domain.com",
> > nonce="42baac51779c17ebe
> > ec20a5ee2f9492821bd723e"..Server: Sip EXpress router (0.9.3
> > (i386/linux))..
> > Content-Length: 0..Warning: ser.ip.address:5060 "Noisy feedback tells:
> > p
> > id=27776 req_src_ip=official.ip.address req_src_port=2062
> > in_uri=sip:domain.com out_uri=sip:domain.com via_cnt==1"
> >
> >
> > T official.ip.address:2062 -> ser.ip.address:5060 [A]
> > REGISTER sip:domain.com SIP/2.0..Via: SIP/2.0/TCP 192.168.10.1:2062;br
> > anch=z9hG4bK-6s4mq8dda681;rport..From: "Test"
> > <sip:test at domain.com>;tag=3q2blh64wf..To: "Test"
> > <sip:test at domain.com>..Call-ID: 3c26818830d4-ugwagbaz5vkz at snom360..CSeq:
> > 23 REGISTER..Max-
> > Forwards: 70..Contact: <sip:test at domain.com:2062;transport=tcp;line=
> > lhzwxw3z>;q=1.0;
> > +sip.instance="<urn:uuid:0c541696-09aa-4d0c-b8ca-fb9889cc61
> > ad>";audio;mobility="fixed";duplex="full";description="snom360";
> > actor="principal";events="dialog";methods="INVITE,ACK,CANCEL,BYE,REFER,OP
> >TIONS,NOTIFY ,SUBSCRIBE,PRACK,MESSAGE,INFO"..User-Agent:
> > snom360/3.60k..Supported: gruu.
> > .Allow-Events: dialog..X-Real-IP: 192.168.10.1..WWW-Contact:
> > <http://192.1
> > 68.10.1:80>..WWW-Contact: <https://192.168.10.1:443>..Authorization:
> > Digestusername="test",realm="domain.com",nonce="42baac51779c17ebeec20a
> >
> > 5ee2f9492821bd723e",uri="sip:domain.com",response="d2415424805014aac504
> > b643ea489795",algorithm=md5..Expires: 3600..Content-Length: 0....
> >
> > T ser.ip.address:5060 -> official.ip.address:2062 [AP]
> > SIP/2.0 200 OK..Via: SIP/2.0/TCP
> > 192.168.10.1:2062;branch=z9hG4bK-6s4mq8dd
> > a681;rport=2062;received=official.ip.address..From: "Test"
> > <sip:test at domain.com>;tag=3q2blh64wf..To: "Test"
> > <sip:test at domain.com>;tag=5431d75005d8ed216f7c100a44746400.d02e..Call-ID:
> > 3c268188 30d4-ugwagbaz5vkz at snom360..CSeq: 23 REGISTER..P-NATed-Caller:
> > Yes..Contact:
> >
> > <sip:test at 192.168.10.1:2056;transport=tcp;line=lhzwxw3z>;q=1;expires=
> > 2204;received="sip:official.ip.address:2056;transport=TCP",
> > <sip:test at 192.168.10.1:2055;transport=tcp;line=lhzwxw3z>;q=1;expires=1551
> >; received="sip:official.ip.address:2055;transport=TCP",
> > <sip:test at 192.168.10.1:2062;transport=tcp;line=lhzwxw3z>;q=1;expires=3600
> >; received="sip:official.ip.address:2062;transport=TCP"..Server: Sip
> > EXpress router (0.9.3 (i386/linux))..Content-Length: 0..
> > Warning: 392 ser.ip.address:5060 "Noisy feedback tells: pid=27776 req_
> > src_ip=official.ip.address req_src_port=2062 in_uri=sip:domain.com
> > out_uri=sip:domain.com via_cnt==1"
> >
> > -----------
> > INVITE
> > -----------
> > T official.ip.address:33255 -> ser.ip.address:5060 [AP]
> > INVITE sip:test at domain.com SIP/2.0..Via: SIP/2.0/TCP 192.168.10.2;
> > branch=z9hG4bK3AA2CBD1;alias..CSeq: 2681 INVITE..To: <sip:test at domain
> > .com>..Content-Type: application/sdp..From: "test2"
> > <sip:test2 at domain.com
> >
> > >;tag=67807379..Call-ID: 1766830276 at 192.168.10.2..Subject: sip:test
> >
> > @domain.com..Content-Length: 230..User-Agent: kphone/4.1.1..Contac
> > t: "test" <sip:test at 192.168.10.2;transport=tcp>....v=0..o=username 0 0
> > IN
> > IP4 192.168.10.2..s=The Funky Flow..c=IN IP4 192.168.10.2..t=0
> > 0..m=audio
> > 32874 RTP/AVP 0 97 8 3..a=rtpmap:0 PCMU/8000..a=rtpmap:3
> > GSM/8000..a=rtpma
> > p:8 PCMA/8000..a=rtpmap:97 iLBC/8000..a=fmtp:97 mode=30..
> > ##
> > T ser.ip.address:5060 -> official.ip.address:33255 [AP]
> > SIP/2.0 407 Proxy Authentication Required..Via: SIP/2.0/TCP
> > 192.168.10.2;b
> >
> > ranch=z9hG4bK3AA2CBD1;alias;rport=33255;received=official.ip.address..CSe
> >q: 2681 INVITE..To: <sip:test at domain.com>;tag=5431d75005d8ed216f7c100a4474
> > 6400.5110..From: "test" <sip:test2 at domain.com>;tag=67807379..Call-I D:
> > 1766830276 at 192.168.10.2..P-NATed-Caller: Yes..Proxy-Authenticate: Diges
> > t realm="domain.com", nonce="42baaf784cd57486fa11fe10929ade10b8fc4
> > 3ec"..Server: Sip EXpress router (0.9.3 (i386/linux))..Content-Length:
> > 0..W
> > arning: 392 ser.ip.address:5060 "Noisy feedback tells: pid=27776
> > req_src_ip=
> > official.ip.address req_src_port=33255 in_uri=sip:test at domain.com
> > out_ur
> > i=sip:test at domain.com via_cnt==1"....
> > ##
> > T official.ip.address:33255 -> ser.ip.address:5060 [AP]
> > ACK sip:test at domain.com SIP/2.0..Via: SIP/2.0/TCP 192.168.10.2;bra
> > nch=z9hG4bK3AA2CBD1;alias..CSeq: 2681 ACK..To: <sip:test at domain.com
> >
> > >;tag=5431d75005d8ed216f7c100a44746400.5110..From: "test2" <sip:test2@
> >
> > domain.com>;tag=67807379..Call-ID:
> > 1766830276 at 192.168.10.2..Content-Leng
> > th: 0..User-Agent: kphone/4.1.1..Contact: "test"
> > <sip:test at 192.168.10.2;tr
> > ansport=tcp>....
> > ##
> > T official.ip.address:33255 -> ser.ip.address:5060 [AP]
> > INVITE sip:test at domain.com SIP/2.0..Via: SIP/2.0/TCP 192.168.10.2;
> > branch=z9hG4bK36EBCF00;alias..CSeq: 2682 INVITE..To:
> > <sip:test at domain.com
> >
> > >..Proxy-Authorization: Digest username="test2 at domain.com", r
> >
> > ealm="domain.com", nonce="42baaf784cd57486fa11fe10929ade10b8fc43ec
> > ", uri="sip:test at domain.com", cnonce="abcdefghi", nc=00000001, resp
> > onse="2c088d59cb24c70c61d890245fe0f5ca", opaque="",
> > algorithm="MD5"..Conten
> > t-Type: application/sdp..From: "test2" <sip:test2 at domain.com>;tag=67
> > 807379..Call-ID: 1766830276 at 192.168.10.2..Subject:
> > sip:test2 at domain.com
> > ..Content-Length: 230..User-Agent: kphone/4.1.1..Contact: "test" <sip:
> > test at 192.168.10.2;transport=tcp>....v=0..o=username 0 0 IN IP4
> > 192.168.0.1
> > 03..s=The Funky Flow..c=IN IP4 192.168.10.2..t=0 0..m=audio 32874
> > RTP/AVP
> > 0 97 8 3..a=rtpmap:0 PCMU/8000..a=rtpmap:3 GSM/8000..a=rtpmap:8
> > PCMA/8000..
> > a=rtpmap:97 iLBC/8000..a=fmtp:97 mode=30..
> > ##
> > T ser.ip.address:5060 -> official.ip.address:33255 [AP]
> > SIP/2.0 100 trying -- your call is important to us..Via: SIP/2.0/TCP
> > 192.16
> >
> > 8.10.2;branch=z9hG4bK36EBCF00;alias;rport=33255;received=official.ip.addr
> >ess..C Seq: 2682 INVITE..To: <sip:test at domain.com>..From: "test" <sip:test
> > @domain.com>;tag=67807379..Call-ID: 1766830276 at 192.168.10.2..P-NA
> > Ted-Caller: Yes..Server: Sip EXpress router (0.9.3
> > (i386/linux))..Content-L
> > ength: 0..Warning: 392 ser.ip.address:5060 "Noisy feedback tells:
> > pid=27776
> > req_src_ip=official.ip.address req_src_port=33255
> > in_uri=sip:test at domain.com
> > out_uri=sip:test at 192.168.10.1:2056;transport=tcp;line=lhzwxw3z vi
> > a_cnt==1"....
> > ##
> > T ser.ip.address:5060 -> official.ip.address:33255 [AP]
> > SIP/2.0 477 Unfortunately error on sending to next hop occurred
> > (477/TM)..V
> > ia: SIP/2.0/TCP
> > 192.168.10.2;branch=z9hG4bK36EBCF00;alias;rport=33255;rece
> > ived=official.ip.address..CSeq: 2682 INVITE..To:
> > <sip:test at domain.com>;t
> > ag=a0de3507a8823f96a254cc0a187acbf0-2573..From: "test2"
> > <sip:test2 at domain.com
> >
> > >;tag=67807379..Call-ID: 1766830276 at 192.168.10.2..P-NATed-Caller:
> >
> > Yes..Server: Sip EXpress router (0.9.3 (i386/linux))..Content-Length:
> > 0..W
> > arning: 392 ser.ip.address:5060 "Noisy feedback tells: pid=27776
> > req_src_ip=
> > official.ip.address req_src_port=33255 in_uri=sip:test at domain.com
> > out_ur
> > i=sip:test at 192.168.10.1:2056;transport=tcp;line=lhzwxw3z via_cnt==1"..
> > ..
> > ##
> > T official.ip.address:33255 -> ser.ip.address:5060 [AP]
> > ACK sip:test at domain.com SIP/2.0..Via: SIP/2.0/TCP 192.168.10.2;bra
> > nch=z9hG4bK36EBCF00;alias..CSeq: 2682 ACK..To: <sip:test at domain.com
> >
> > >;tag=a0de3507a8823f96a254cc0a187acbf0-2573..From: "test2"
> >
> > <sip:test2 at domain
> > .com>;tag=67807379..Call-ID: 1766830276 at 192.168.10.2..Content-Leng
> > th: 0..User-Agent: kphone/4.1.1..Contact: "test"
> > <sip:test at 192.168.10.2;tr
> > ansport=tcp>....
> > #
>
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