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[Serusers] problem connecting two asterisk servers through SER
by Sameer Ahmed 22 Sep '06

22 Sep '06

Hi We have two asterisks registered as UA's. SER is acting as a proxy server. We want to make calls between two asterisk users through SER. One asterisk server has extensions starting with 2, and the other one has extensions starting with 4. We route the calls based on the first digit. We are unable to call from an extension on one asterisk server to the other asterisk server. "rewritehostport" doesn't seem to be doing the trick for us. Does anyone have a solution? Below is our ser.cfg file: =====================SER.CFG===================== # # $Id: ser.cfg,v 1.25.2.1 2005/02/18 14:30:44 andrei Exp $ # # simple quick-start config script # # ----------- global configuration parameters ------------------------ debug=9 # debug level (cmd line: -dddddddddd) #fork=yes #log_stderror=no # (cmd line: -E) /* Uncomment these lines for debugging */ #fork=no #log_stderror=yes check_via=no # (cmd. line: -v) dns=no # (cmd. line: -r) rev_dns=no # (cmd. line: -R) port=5060 children=4 fifo="/tmp/ser_fifo" fifo_mode=0666 fifo_db_url="mysql://ser:heslo@192.168.1.60 /ser" # ------------------ module loading ---------------------------------- # Uncomment this if you want to use SQL database loadmodule "/usr/lib/ser/modules/mysql.so" loadmodule "/usr/lib/ser/modules/sl.so" loadmodule "/usr/lib/ser/modules/tm.so" loadmodule "/usr/lib/ser/modules/rr.so" loadmodule "/usr/lib/ser/modules/maxfwd.so" loadmodule "/usr/lib/ser/modules/usrloc.so" loadmodule "/usr/lib/ser/modules/registrar.so" loadmodule "/usr/lib/ser/modules/textops.so" # Uncomment this if you want digest authentication # mysql.so must be loaded ! loadmodule "/usr/lib/ser/modules/auth.so" loadmodule "/usr/lib/ser/modules/auth_db.so" # ----------------- setting module-specific parameters --------------- # -- usrloc params -- #modparam("usrloc", "db_mode", 0) # Uncomment this if you want to use SQL database # for persistent storage and comment the previous line modparam("usrloc", "db_mode", 2) # -- auth params -- # Uncomment if you are using auth module # modparam("auth_db", "calculate_ha1", yes) # # If you set "calculate_ha1" parameter to yes (which true in this config), # uncomment also the following parameter) # modparam("auth_db", "password_column", "password") # -- rr params -- # add value to ;lr param to make some broken UAs happy modparam("rr", "enable_full_lr", 1) # ------------------------- 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"); break; }; if (msg:len >= 2048 ) { sl_send_reply("513", "Message too big"); break; }; if(method == "INVITE") { if (uri =~ "sip:2[0-9]{3}@*"){ log(1, "Forwarding to PakVista BlueFlash\n"); route(2); break; } else if (uri =~ "sip:4[0-9]{3}@*"){ log(1, "Forwarding to MyRoom BlueFlash\n"); route(3); break; } } log(1, "After INVITE\n"); # we record-route all messages -- to make sure that # subsequent messages will go through our proxy; that's # particularly good if upstream and downstream entities # use different transport protocol if (!method=="REGISTER") record_route(); log(1, "After REGISTER\n"); # subsequent messages withing a dialog should take the # path determined by record-routing if (loose_route()) { # mark routing logic in request append_hf("P-hint: rr-enforced\r\n"); route(1); break; }; if (!uri==myself) { log(1,"Inside NOT uri==myself \n"); # mark routing logic in request append_hf("P-hint: outbound\r\n"); route(1); break; }; # if the request is for other domain use UsrLoc # (in case, it does not work, use the following command # with proper names and addresses in it) if (uri==myself) { log(1, "Inside uri==myself\n"); if (method=="REGISTER") { # Uncomment this if you want to use digest authentication if (!www_authorize("192.168.1.60", "subscriber")) { www_challenge(" 192.168.1.60", "0"); break; }; save("location"); break; }; lookup("aliases"); if (!uri==myself) { append_hf("P-hint: outbound alias\r\n"); route(1); break; }; # native SIP destinations are handled using our USRLOC DB if (!lookup("location")) { log(1, "location Not Found\n"); sl_send_reply("404", "Not Found"); break; }; }; append_hf("P-hint: usrloc applied\r\n"); route(1); } route[1] { log(1, "Inside route 1\n"); # send it out now; use stateful forwarding as it works reliably # even for UDP2TCP if (!t_relay()) { sl_reply_error(); }; } route[2] { log(1, "Inside route 2\n"); rewritehostport("192.168.1.61:5060"); if (!t_relay()) { log(1, "t_relay error\n"); sl_reply_error(); }; log(1, "Leaving route 2\n"); } route[3] { log(1, "Inside route 3\n"); rewritehostport("192.168.1.62"); if (!t_relay()) { log(1, "t_relay error\n"); sl_reply_error(); }; #forward(uri:host, uri:port); log(1, "Leaving route 3\n"); ===============================EOF========================

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[Serusers] some error messages
by jorain 22 Sep '06

22 Sep '06

Hi all, Did anyone have encountered these error codes? Error: str2i(AmUtils.cpp:149):str2i:unexpected char R in RTP/AVP 97409 Error: parse_sdp_media(AmSdp.cpp:549)while parsing 'm=audio' line Error: 400 session description parsing failed. pthread_detach failed with code EINVAL:thread already in detached state Error: reply(AmRequest.cpp:335):AmRequestUAS::reply:400 fifo_t_reply:to-ta expected Error: writeToBuffer(IsdnCapiConnection.cpp:544):Warning:dropping data, try increase AUDIO_BUFFER_LEN... Error: changeSIPState(IsdnCall.cpp:339):unhandled SIP state transition(inbound) from (DISCONNECTED|DISCONNECTED) to (CONNECTED|DISCONNECTED) Thanks Regards, jorain

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Re: [Users] serweb: DB.php is missing on my system
by Ferianto siregar 22 Sep '06

22 Sep '06

Dear Roland, I think that DB.php is missing, So, you need DB.php packet. You can download it from http://pear.php.net For the installation, you can type # pear <name of the packet> There is also many tutorials about it in that web. I do hope this can help you. :) Thank you Regards, Ferianto Message: 4 Date: Fri, 22 Sep 2006 07:43:16 +0800 From: Ronald Wiplinger Subject: [Users] serweb: DB.php is missing on my system To: Openser Message-ID: <45132394.8040309(a)elmit.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed [Fri Sep 22 06:54:42 2006] [error] [client 192.168.250.108] PHP Warning: require_once(DB.php) [href='function.require-once'>function.require-once]: failed to open stream: No such file or directory in /srv/www/serweb/html/main_prepend.php on line 38 [Fri Sep 22 06:54:42 2006] [error] [client 192.168.250.108] PHP Fatal error: require_once() [href='function.require'>function.require]: Failed opening required 'DB.php' (include_path='.:/usr/share/php5:/usr/share/php5/PEAR') in /srv/www/serweb/html/main_prepend.php on line 38 # locate DB.php /usr/share/php5/PEAR/PEAR/DependencyDB.php How can I get it? In the meantime I have tried to turn off loging in config.php: $config->enable_loging = false; $config->log_file = "/var/log/serweb"; but get still the same error. SuSE 10.1 installed pear5 (there is no 'pear') # pear5 list Installed packages, channel pear.php.net: ========================================= Package Version State Archive_Tar 1.3.1 stable Console_Getopt 1.2 stable PEAR 1.4.6 stable # pear5 list-all PHP Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 8208 bytes) in /usr/share/php5/PEAR/PEAR/Registry.php on line 1048 What do I need to do? bye Ronald ------------------------------ _______________________________________________ Users mailing list Users(a)openser.org http://openser.org/cgi-bin/mailman/listinfo/users End of Users Digest, Vol 16, Issue 54 ************************************* --------------------------------- Get your own web address for just $1.99/1st yr. We'll help. Yahoo! Small Business.

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[Users] TLS problem : May I ask you again..Please....
by Ferianto siregar 22 Sep '06

22 Sep '06

Dear all, First I would like to say thanks to every body in this forum. Thank you very much.. All, I am sorry for my message again. Sorry for the long message. I am in rush and panic. I have read the instruction in tls.htm about TLS configuration many times. But, Untill now, I can not build it. Maybe because of my lack understanding and skill. When I run "netstat -anp|grep 5061", I got this output message : [root@localhost root]# netstat -anp|grep 5061 tcp 0 0 202.95.149.251:5061 0.0.0.0:* LISTEN 5099/openser [root@localhost root]# netstat -anp|grep 5060 tcp 0 0 202.95.149.251:5060 0.0.0.0:* LISTEN 5099/openser udp 0 0 202.95.149.251:5060 0.0.0.0:* 5099/openser From the output, I can see that the port 5061 (for TLS) can be loaded. But, why when I run "ngrep -d any...", there is no port 5061? Here is the output U 202.95.149.3:5060 -> 202.95.149.251:5060 .. #### T 127.0.0.1:32804 -> 127.0.0.1:631 [AP] POST / HTTP/1.1.. ## T 127.0.0.1:32804 -> 127.0.0.1:631 [AP] Content-Length: 220.. ## T 127.0.0.1:32804 -> 127.0.0.1:631 [AP] Content-Type: application/ipp.. ## T 127.0.0.1:32804 -> 127.0.0.1:631 [AP] Host: localhost.. ## T 127.0.0.1:32804 -> 127.0.0.1:631 [AP] .. ## T 127.0.0.1:32804 -> 127.0.0.1:631 [AP] ........ ## T 127.0.0.1:631 -> 127.0.0.1:32804 [AP] HTTP/1.1 200 OK.. # T 127.0.0.1:631 -> 127.0.0.1:32804 [AP] Date: Fri, 22 Sep 2006 08:10:21 GMT.. ## T 127.0.0.1:631 -> 127.0.0.1:32804 [AP] Server: CUPS/1.1..Connection: Keep-Alive..Keep-Alive: timeout=60..Content-Language: C..Content-Type: application/ipp; ch arset=iso-8859-1..Content-Length: 81.............G..attributes-charset..utf-8H..attributes-natural-language..en-us.utf-8 . What should I do? Please help me..Please give me a suggestion. These are the tasks that I have done before : 1. I have added in DNS Records : pcr.ac.id IN NAPTR 50 50 "s" "SIPS+D2T" "" _sips._tcp.pcr.ac.id. pcr.ac.id IN NAPTR 60 40 "s" "SIP+D2T" "" _sip._tcp.pcr.ac.id. pcr.ac.id IN NAPTR 60 60 "s" "SIP+D2U" "" _sip._udp.pcr.ac.id 2. Here is my openser.cfg configuration : debug=9 fork=no log_stderror=yes listen=202.95.149.251 # put your openserver IP address here port=5060 children=4 dns=no rev_dns=no fifo="/tmp/openser_fifo" fifo_db_url="mysql://openser:openserrw@localhost/openser" fifo_mode=0666 alias="pcr.ac.id" tls_port_no=5061 # uncomment the following lines for TLS support disable_tls = 0 listen = tls:202.95.149.251:5061 #listen = udp:202.95.149.251:5060 tls_verify_client = on tls_require_client_certificate = on tls_verify_server=on tls_method = TLSv1 tls_certificate = "/usr/local/etc/openser/tls/user/user-cert.pem" tls_private_key = "/usr/local/etc/openser/tls/user/user-privkey.pem" tls_ca_list = "/usr/local/etc/openser/tls/user/user-calist.pem" loadmodule "/usr/local/lib/openser/modules/mysql.so" loadmodule "/usr/local/lib/openser/modules/sl.so" loadmodule "/usr/local/lib/openser/modules/tm.so" loadmodule "/usr/local/lib/openser/modules/rr.so" loadmodule "/usr/local/lib/openser/modules/maxfwd.so" loadmodule "/usr/local/lib/openser/modules/usrloc.so" loadmodule "/usr/local/lib/openser/modules/registrar.so" loadmodule "/usr/local/lib/openser/modules/auth.so" loadmodule "/usr/local/lib/openser/modules/auth_db.so" loadmodule "/usr/local/lib/openser/modules/nathelper.so" loadmodule "/usr/local/lib/openser/modules/textops.so" loadmodule "/usr/local/lib/openser/modules/uri_db.so" loadmodule "/usr/local/lib/openser/modules/uri.so" loadmodule "/usr/local/lib/openser/modules/avpops.so" loadmodule "/usr/local/lib/openser/modules/domain.so" loadmodule "/usr/local/lib/openser/modules/permissions.so" modparam("auth_db|permissions|uri_db|usrloc","db_url", "mysql://openser:openserrw@localhost/openser") modparam("auth_db|uri_db|usrloc", "db_url", "mysql://openser:openserrw@localhost/openser") modparam("auth_db", "calculate_ha1", 1) modparam("auth_db", "password_column", "password") modparam("nathelper", "natping_interval", 30) modparam("nathelper", "ping_nated_only", 1) modparam("nathelper", "rtpproxy_sock", "unix:/var/run/rtpproxy.sock") modparam("usrloc", "db_mode", 2) modparam("registrar", "nat_flag", 6) modparam("rr", "enable_full_lr", 1) modparam("tm", "fr_inv_timer", 27) modparam("tm", "fr_inv_timer_avp", "s:inv_timeout") modparam("permissions", "db_mode", 1) modparam("permissions", "trusted_table", "trusted") route { # ----------------------------------------------------------------- # Sanity Check Section # ----------------------------------------------------------------- if (!mf_process_maxfwd_header("10")) { sl_send_reply("483", "Too Many Hops"); return; }; if (msg:len > max_len) { sl_send_reply("513", "Message Overflow"); return; }; # ----------------------------------------------------------------- # Record Route Section # ----------------------------------------------------------------- if (method!="REGISTER") { record_route(); }; if (method=="BYE" || method=="CANCEL") { unforce_rtp_proxy(); } # ----------------------------------------------------------------- # Loose Route Section # ----------------------------------------------------------------- if (loose_route()) { if (has_totag() && (method=="INVITE" || method=="ACK")) { if (nat_uac_test("19")) { setflag(6); force_rport(); fix_nated_contact(); }; force_rtp_proxy("l"); }; route(1); return; }; # ----------------------------------------------------------------- # Call Type Processing Section # ----------------------------------------------------------------- if (uri!=myself) { route(5); route(1); return; }; if (uri==myself) { if (method=="ACK") { route(6); return; } else if (method=="CANCEL") { route(3); return; } else if (method=="INVITE") { route(3); return; } else if (method=="REGISTER") { route(2); return; }; lookup("aliases"); if (uri!=myself) { route(5); route(1); return; }; if (!lookup("location")) { sl_send_reply("404", "Uopenser Not Found"); return; }; }; route(1); } route[1] { # ----------------------------------------------------------------- # Default Message Handler # ----------------------------------------------------------------- t_on_reply("1"); if (!t_relay()) { if (method=="INVITE" && isflagset(6)) { unforce_rtp_proxy(); }; sl_reply_error(); }; } route[2] { # ----------------------------------------------------------------- # REGISTER Message Handler # ---------------------------------------------------------------- sl_send_reply("100", "Trying"); if (!search("^Contact:\ +\*") && nat_uac_test("19")) { setflag(6); fix_nated_register(); force_rport(); }; if (!www_authorize("pcr.ac.id","subscriber")) { www_challenge("pcr.ac.id","0"); return; }; if (!check_to()) { sl_send_reply("401", "Unauthorized"); return; }; consume_credentials(); if (!save("location")) { sl_reply_error(); }; } route[3] { # ----------------------------------------------------------------- # CANCEL and INVITE Message Handler # ----------------------------------------------------------------- if (nat_uac_test("19")) { setflag(6); } #if (!allow_trusted() && nat_uac_test("19")) { # setflag(6); #} lookup("aliases"); if (method=="INVITE" && !allow_trusted()) { if (!proxy_authorize("pcr.ac.id","subscriber")) { proxy_challenge("pcr.ac.id","0"); return; } else if (!check_from()) { sl_send_reply("403", "Use From=ID"); return; }; consume_credentials(); }; if (uri=~"^sip:9[0-9]*@") { route(4); return; }; if (uri!=myself) { route(5); route(1); return; }; if (!lookup("location")) { if (uri=~"^sip:[0-9]{10}@") { route(4); return; }; sl_send_reply("404", "Uopenser Not Found"); return; }; if (method=="CANCEL") { route(1); return; } if (isflagset(6)) { force_rport(); fix_nated_contact(); force_rtp_proxy(); }; t_on_reply("1"); if (!t_relay()) { if(isflagset(6)) { unforce_rtp_proxy(); } sl_reply_error(); }; } route[4] { # ----------------------------------------------------------------- # PSTN Handler # ----------------------------------------------------------------- rewritehostport("202.95.149.254:5060"); # INOPENSERT YOUR PSTN GATEWAY IP ADDRESS # avp_write("i:45", "inv_timeout"); #if (!allow_trusted() && isflagset(6)) { if (isflagset(6)) { force_rport(); fix_nated_contact(); force_rtp_proxy(); }; route(1); } onreply_route[1] { if (isflagset(6) && status=~"(180)|(183)|2[0-9][0-9]") { if (!search("^Content-Length:\ +0")) { force_rtp_proxy(); }; }; if (nat_uac_test("1")) { fix_nated_contact(); }; } What should I add in openser.cfg? Please help..Please.. Thank you very much, Regards, Ferianto --------------------------------- Do you Yahoo!? Everyone is raving about the all-new Yahoo! Mail.

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[Serusers] Call btn two SIP Servers -Thanks
by Sharon Abraham 22 Sep '06

22 Sep '06

Hi guys, Could final get the call thru both the SER poxies. Thanks for all the tips. Sharon Abraham Network Engineer Afila Tech India (p) Ltd www.afila.com

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[Serusers] How to configure multi-domain?
by Ricardo Carvalho 22 Sep '06

22 Sep '06

I've added the following lines to my ser.cfg file: ################### modparam("usrloc", "use_domain", 1) #If the domain part of the user should be also saved and used for identifing the user (along with the username part). Useful in multi domain scenarios. Non 0 value means true. modparam("registrar", "use_domain", 1) # If set to 1 then the registrar will use username@domain as address of record. If the variable is set to 0 then only username will be used as the address of record. Default value is 0. ################### I've added 2 diferent domains to the domain table, and got different phones registered with those different domains. Although, after editing that way ser.cfg file, my phones still register in Ser, but none of them can call any other, even if I call someone only by username or by username@domain. Am I in the right path to configure a multi-domain Ser server? What else should I do to make things work fine? Regards, Ricardo.

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Re: [Serusers] RTP being sent to wrong port
by Jiri Kuthan 22 Sep '06

22 Sep '06

The client should be then fixed or exchanged. It is not yet a BCP RFC or so, but it should be soon. In the meantime it is just an informal but important practice to build clients in a symmetric way. I'm actually aware of few that are not build this way. -jiri At 18:12 20/09/2006, Andrey Kuprianov wrote: >Just looked up the code to make sure... :) It's definitely assymetric! >Thanks Vamsi!!! > >On 9/20/06, Vamsi Pottangi <vamsipottangi(a)gmail.com> wrote: >> >>Symmetric client uses the same port to send and receive messages. >> >> >>On 9/20/06, Andrey Kuprianov <andrey.kouprianov(a)gmail.com > wrote: >>> Forgive my ignorance. I know the term "symmetric client", but i dont >>> really know what that means. Can u please explain or just give me some >>> doc/rfc to read? :) >>> >>> Andrey. >>> >>> On 9/20/06, Vamsi Pottangi < vamsipottangi(a)gmail.com> wrote: >>> > >>> > Is your application symmetric? >>> > >>> > >>> > On 9/20/06, Andrey Kuprianov < andrey.kouprianov(a)gmail.com> wrote: >>> > > >>> > Hi, >>> > >>> > Im facing this problem for a few days already. Hope someone might have >>> > an idea or two. It's a long email too, btw. >>> > >>> > Im testing my app behind NAT's with SER-0.9.6 + mediaproxy + Asterisk >>> > (conf server). While X-Lite works *fine* and I get 2 way audio always, >>> > my app seems to have some kind of weird bug and I end up with 1 way >>> > audio stream. >>> > >>> > Here's the thing. Application starts receiver and transmitter on >>> > completely different ports. Here's SDP for remote and local machines >>> > (public IP's been x'ed by myself, of course): >>> > >>> > This one's sent in INVITE message to SER ==> >>> > 69563 DEBUG media.MediaManager - Local SDP: (this one's from local >>machine) >>> > v=0 >>> > o=xps 1158739216750 1158739216757 IN IP4 192.168.1.3 >>> > s=MC >>> > c=IN IP4 192.168.1.3 >>> > t=0 0 >>> > m=audio 25000 RTP/AVP 0 8 >>> > a=rtpmap:0 PCMU/8000 >>> > a=rtpmap:8 PCMA/8000 >>> > a=sendrecv >>> > >>> > This one's sent with 200 OK from SER ==> >>> > 69563 DEBUG media.MediaManager - Remote SDP: >>> > v=0 >>> > o=root 2500 2500 IN IP4 203.159.x.x >>> > s=session >>> > c=IN IP4 203.159.x.x >>> > t=0 0 >>> > m=audio 30004 RTP/AVP 0 8 >>> > a=rtpmap:0 PCMU/8000 >>> > a=rtpmap:8 PCMA/8000 >>> > a=silenceSupp:off - - - - >>> > >>> > The further log shows that transmitters and receivers have started on >>> > the proper IP/port ==> >>> > >>> > 69594 DEBUG media.AVReceiver - Start listening for RTP @ addr: >>> > 192.168.1.3 port: 25000 ttl: 1 >>> > 69657 DEBUG media.AVTransmitter - Created transmitter for: >>> > [203.159.x.x] at ports: [30004] encoded as: [[ULAW/rtp, alaw]] >>> > 69657 DEBUG media.MediaManager - Starting transmission >>> > 69672 DEBUG media.AVTransmitter - Track 0 is set to transmit as: >>> > ULAW/rtp, 8000.0 Hz, 8-bit, Mono, FrameSize=8 bits >>> > 69860 INFO media.AVTransmitter - Binded to port 30004 >>> > 69875 DEBUG media.AVTransmitter - Started transmitting track 0 encoded >>> > as ULAW/rtp @ [203.159.x.x]:30004 >>> > >>> > Nevertheless, the Ethereal capture shows that mediaproxy sends the >>> > stream NOT to port 25000 (local port), but to port 30004 (remote >>> > port)!! Why? This is not the case with X-Lite, however. Xlite captures >>> > show that streams are sent to proper ports always. Btw, Im attaching >>> > SIP+RTP Ethereal captures with this mail. Please, take a look. >>> > >>> > I also want to mention, that this doesnt happen with my app. for all >>> > the NATed nets. In some nets it works fine, but not in this one. Just >>> > weird. >>> > >>> > Please, let me know if anyone has ideas or hints regarding this nonsence >>:) >>> > >>> > Bests, >>> > >>> > Andrey. >>> > >>> > >>> > _______________________________________________ >>> > Serusers mailing list >>> > Serusers(a)lists.iptel.org >>> > http://lists.iptel.org/mailman/listinfo/serusers >>> > >>> > >>> > >>> > >>> > >>> _______________________________________________ >>> Serusers mailing list >>> Serusers(a)lists.iptel.org >>> http://lists.iptel.org/mailman/listinfo/serusers >>> >> >_______________________________________________ >Serusers mailing list >Serusers(a)lists.iptel.org >http://lists.iptel.org/mailman/listinfo/serusers -- Jiri Kuthan http://iptel.org/~jiri/

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[Serusers] List of Routing functions/commands
by Sameer Ahmed 22 Sep '06

22 Sep '06

Hi Where can I get a list (with description) of all the routing functions/commands that can be used in ser.cfg? Thank you. Regards, Sameer

2 1

[Serusers] Scaling SER
by Jon Farmer 22 Sep '06

22 Sep '06

Hi I currently have a single SER server using MySQL for data storage. Due to the number of users I now have and to help redundancy I want to setup another SER server. I have search the web and have not been able to find a tutorial on this so I hope someone on this list can help. I need the SER servers to at least know about the location of clients registered with each server. Therefore can I point both servers at the same MySQL and for them to share the data? Are there any issues around this strategy? Is there another way to accomplish what I want? Regards Jon -- Jon Farmer Telford, Shropshire, UK

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[Serusers] STUN characteristics
by sip 22 Sep '06

22 Sep '06

I'm doing an experiment with our userbase at the moment, making some modifications to allow more users to register than who'd been allowed to register before (to minimise the amount of bandwidth we need to use for our services, we are trying to absolutely minimise the number of users that require the use of an RTPproxy, since, in a userbase of 100,000 users, this can be rather pricey if there are too many of them which require it). We used to not allow anyone with a contact header that was NOT a public IP address to register onto the system, with the assumption that they could use STUN and it SHOULD rewrite the contact header. This assumption has proven to be... optimistic. Several of the UAs we see show radically different characteristics during this 'open' trial, and I'm not sure if they're just differing STUN versions or if our users simply can't follow the install/configure instructions. SO... my question becomes: what are the characterstics of functioning STUN implementations and how they should overwrite contact/via/sdp headers for the UA's messages? Most every one of the STUN implementations I've seen rewrites the Contact header and the data inside the O and C lines in the SDP header. Most of them seem to overwrite the Via headers with valid information as well, although not all of them do. What are some other things I should be looking for? I'm trying to essentially test for a particular variant of STUN, allowing users who've at least followed the instructions to the letter to have working and usable clients (perhaps using RTP proxy where needed) while not allowing users who're still attempting to use private IPs for everything to waste our bandwidth because they're not following the instructions or they're using a UA that is, in effect, broken in its implementation. This is a lot more complex than it sounds, I know, but I think if I have more data to work with, I might be able to come up with a more acceptable scenario than we currently employ. N.

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