sr-users April 2008

sr-users@lists.kamailio.org

141 participants
187 discussions

[OpenSER-Users] Proxy Authorization - Two Digests
by Adrian Georgescu 28 Apr '08

28 Apr '08

Ash, You can set up the SIP Proxies to use the same nonce. Adrian >>>>>>>>>> We are having a separate issue now with our ATA - the ATA (a cheap generic brand) we use as our CPE, won't issue two digest authentication response unlike X-Lite. Seems like we will be forced to use authentication at B2BUA level only after all. Anyone knows any ATA positively supports sending two separate authentication digests for two separate nonce in same INVITE? Ovidiu Sas wrote: > I don't think it is reported. > > On Fri, Apr 25, 2008 at 6:36 AM, Iñaki Baz Castillo <ibc at in.ilimit.es> wrote: > >> El Friday 25 April 2008 09:57:09 Ovidiu Sas escribió: >> >> >>> Yes, it should work but it doesn't. >>> >> > I remember trying this long time ago (using openser 1.0 and chaining >> > several openser proxies) and I hit the same issue: openser is not able >> > to deal properly with multiple Proxy-Authorization headers. >> >> So this is a bug (IMHO an important bug), isn't? is it reported? >> >> >> -- >> >>

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[OpenSER-Users] interaction between msrp and openser
by Adrian Georgescu 28 Apr '08

28 Apr '08

Hi Gaoqiang, MSRPRelay is not dependent on OpenSER. You can set it up separately based on the instructions available at http://msrprelay.org. You only need a client with support for the MSRP relay extension, the SIP session can be established by any version of OpenSER. I believe you refer to the MSRP chat server when you say "session switch". MSRP chat server is work in progress, no software has been released yet, we plan to release a first version this summer. Regards, Adrian >>> Hi list, Could anyone here tell me is the openser 1.3.x version support MSRP(e.g. MSRPRelay)? Is there any document describe how to configure the openser work with MSRP(MSRPRelay) as a message session switch. Does anyone have successful experience configure openser to work with the MSRP Relay. Thanks a lot. -- Gaoqiang Qian Automation System and Technology Helsinki University Of Technology GSM: +358415058138

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[OpenSER-Users] Force OpenSER to send all SIP messages to src_port
by Höskuldur 27 Apr '08

27 Apr '08

Hi, How can I force OpenSER to send all SIP messages to source port of the UA? That is, the same port as userloc lists in MySQL/openser/location/received column? For some reason it only sends the Invite message to that port, but then all Info,Ack,Ok messages go to the port found in VIA...which the UA doesn't receive because it's behind NAT. I've tried force_rport(); without any success, but I must admit that I'm not sure I used it in the right route. My config is previously posted here: http://www.voipuser.org/forum_topic_12946.html Any ideas?

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[Serusers] RTPProxy
by Strassburger, Patrick 27 Apr '08

27 Apr '08

> Hi all, > > Is there an easy way to disable RTPProxy for certain calls eg. based > on called number? > Am using the ser.cfg from > http://www.iptel.org/ser/howtos/optimizing_the_use_of_rtp_proxy. > > For whatever reason all calls are passing the RTPProxy. > - I would like to disable the RTPProxy for calls where I know the > destination is able to handle NAT. > - For calls where I know both UAT are behind the same NAT. > As soon as I update the realm of those clients with whatever > value beside the ser IP adress, those useres cannot login anymore. > > Is this sufficient information - do you need the ser.cfg? > > Thanks > Patrick > > > ************************************************************************************* The message is intended for the named addressee only and may not be disclosed to or used by anyone else, nor may it be copied in any way. The contents of this message and its attachments are confidential and may also be subject to legal privilege. If you are not the named addressee and/or have received this message in error, please advise us by e-mailing security(a)colt.net and delete the message and any attachments without retaining any copies. Internet communications are not secure and COLT does not accept responsibility for this message, its contents nor responsibility for any viruses. No contracts can be created or varied on behalf of COLT Telecommunications, its subsidiaries or affiliates ("COLT") and any other party by email Communications unless expressly agreed in writing with such other party. Please note that incoming emails will be automatically scanned to eliminate potential viruses and unsolicited promotional emails. For more information refer to www.colt.net or contact us on +44(0)20 7390 3900.

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[OpenSER-Users] SIP SIMPLE - XMPP interoperability issue
by Gaoqiang Qian 27 Apr '08

27 Apr '08

Hello everyone, I have setup the openser server with the very basic default configuration. Now I have to configure my openser server to connect with a xmpp envoironment on another host with a purpose of piloting the SIP SIMPLE - XMPP IOP. So does anyone here have successful experience of configure openser to connect with XMPP on different hosts? Or could someone provide me some instruction how to configure it. Thanks a lot in advance -- Gaoqiang Qian Automation System and Technology Helsinki University Of Technology GSM: +358415058138

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[OpenSER-Users] OpenSER+mediaproxy changes SIP dst port so client never receives ACK, causing timeout
by Höskuldur 27 Apr '08

27 Apr '08

I hope I'm not waisting your time with a problem that has a obvious solution, I've actually tried to find a similar case without any success. I'm making a call between two NATed clients which are using STUN. The call goes through OpenSER which is configured to use mediaproxy - see my config at the bottom of my email Below is a dump from the location table: MySQL / openser / location _______________________________________________________________________ | contact | received | flag | ----------------------------------------------------------------------- |sip:1007@130.XXX.XXX.XXX:49162 |sip:130.XXX.XXX.XXX:49163 | 1 | |sip:1003@85.XXX.XXX.XXX:3676 | sip:85.XXX.XXX.XXX:3688 | 1 | ----------------------------------------------------------------------- The problem is that the call from 1003 to 1007 initiates OK, but disconnects after 20-30 seconds. From my logs it looks like OpenSER stops sending SIP messages to port 49163 after getting SDP from 1007, but starts sending to 49162 instead, so 1007 never gets the ACK message. So 1007 repeatedly sends SDP description but OpenSER replies to the wrong port. Please see the attached picture, graph from Wireshark.If the picture doesn't attach, it can be found here: http://hoski.public.is/openser.jpg So my question is, why does OpenSER stop sending SIP messages to port: 49163 and how can I fix it? Thanks in advance, Hoski listen = XX.XXX.XX.XXX mpath = "/usr/lib/openser/modules" children = 8 debug = 3 fork = yes group = "openser" user = "openser" disable_tcp = no log_facility=LOG_LOCAL7 log_stderror = no tcp_children = 4 fifo = "/tmp/openser_fifo" fifo_db_url="mysql://openser:XXXX@localhost/openser" # ATH: PrÃ³eftir BOSTON fifo_group = "openser" fifo_mode = 0666 fifo_user = "openser" mhomed = no server_signature = yes sock_group = "openser" sock_mode = 0600 sock_user = "openser" unix_sock = "/tmp/openser.sock" unix_sock_children = 1 reply_to_via = no sip_warning = no check_via = no dns = no rev_dns = no syn_branch = yes disable_core_dump = no dns_try_ipv6 = yes dns_use_search_list = yes loadmodule "usrloc.so" modparam("usrloc", "user_column", "username") modparam("usrloc", "domain_column", "domain") modparam("usrloc", "contact_column", "contact") modparam("usrloc", "expires_column", "expires") modparam("usrloc", "q_column", "q") modparam("usrloc", "callid_column", "callid") modparam("usrloc", "cseq_column", "cseq") modparam("usrloc", "methods_column", "methods") modparam("usrloc", "flags_column", "flags") modparam("usrloc", "user_agent_column", "user_agent") modparam("usrloc", "received_column", "received") modparam("usrloc", "socket_column", "socket") modparam("usrloc", "use_domain", 0) modparam("usrloc", "desc_time_order", 0) modparam("usrloc", "timer_interval", 60) modparam("usrloc", "db_url", "mysql://openser:openserrw@localhost/openser") modparam("usrloc", "db_mode", 1) modparam("usrloc", "matching_mode", 0) modparam("usrloc", "cseq_delay", 20) loadmodule "mediaproxy.so" modparam("mediaproxy", "mediaproxy_socket", "/var/run/mediaproxy/proxydispatcher.sock") modparam("mediaproxy", "sip_asymmetrics", "/etc/openser/sip-asymmetric-clients") modparam("mediaproxy", "rtp_asymmetrics", "/etc/openser/rtp-asymmetric-clients") modparam("mediaproxy", "natping_interval", 30) loadmodule "rr.so" modparam("rr", "enable_full_lr", 0) modparam("rr", "append_fromtag", 1) modparam("rr", "enable_double_rr", 1) modparam("rr", "add_username", 0) loadmodule "tm.so" modparam("tm", "fr_timer", 30) modparam("tm", "fr_inv_timer", 120) modparam("tm", "wt_timer", 5) modparam("tm", "delete_timer", 2) modparam("tm", "retr_timer1p1", 1) modparam("tm", "retr_timer1p2", 2) modparam("tm", "retr_timer1p3", 4) modparam("tm", "retr_timer2", 4) modparam("tm", "noisy_ctimer", 0) modparam("tm", "ruri_matching", 1) modparam("tm", "via1_matching", 1) modparam("tm", "unix_tx_timeout", 2) modparam("tm", "restart_fr_on_each_reply", 1) modparam("tm", "fr_timer_avp", "s:callee_fr_timer") modparam("tm", "fr_inv_timer_avp", "s:callee_fr_inv_timer") modparam("tm", "pass_provisional_replies", 0) loadmodule "xlog.so" modparam("xlog", "buf_size", 4096) modparam("xlog", "force_color", 1) loadmodule "domain.so" modparam("domain", "db_url", "mysql://openser:XXXXXXX@localhost/openser") modparam("domain", "db_mode", 1) modparam("domain", "domain_table", "domain") modparam("domain", "domain_col", "domain") loadmodule "nathelper.so" modparam("nathelper", "natping_interval", 180) modparam("nathelper", "ping_nated_only", 0) modparam("nathelper", "received_avp", 42) modparam("nathelper", "rtpproxy_sock", "unix:/var/run/rtpproxy.sock") modparam("nathelper", "rtpproxy_disable", 1) modparam("nathelper", "rtpproxy_disable_tout", 60) modparam("nathelper", "rtpproxy_tout", 1) modparam("nathelper", "rtpproxy_retr", 5) modparam("nathelper", "sipping_method", "OPTIONS") loadmodule "textops.so" loadmodule "sl.so" modparam("sl", "enable_stats", 1) loadmodule "uri.so" loadmodule "registrar.so" modparam("registrar", "default_expires", 3600) modparam("registrar", "min_expires", 60) modparam("registrar", "max_expires", 0) modparam("registrar", "default_q", 0) modparam("registrar", "append_branches", 1) modparam("registrar", "use_domain", 0) modparam("registrar", "case_sensitive", 0) modparam("registrar", "desc_time_order", 0) modparam("registrar", "received_avp", 42) modparam("registrar", "received_param", "received") modparam("registrar", "max_contacts", 0) modparam("registrar", "retry_after", 0) modparam("registrar", "use_branch_flags", 0) modparam("registrar", "method_filtering", 0) modparam("registrar", "path_mode", 2) modparam("registrar", "path_use_received", 0) modparam("registrar", "nat_flag", 6) loadmodule "maxfwd.so" modparam("maxfwd", "max_limit", 256) loadmodule "mysql.so" modparam("mysql", "ping_interval", 300) modparam("mysql", "auto_reconnect", 1) loadmodule "auth.so" modparam("auth", "nonce_expire", 300) modparam("auth", "rpid_suffix", ";party=calling;id-type=subscriber;screen=yes") modparam("auth", "rpid_avp", "s:rpid") loadmodule "auth_db.so" modparam("auth_db", "db_url", "mysql://openser:XXXXXX@localhost/openser") modparam("auth_db", "user_column", "username") modparam("auth_db", "domain_column", "domain") modparam("auth_db", "password_column", "password") modparam("auth_db", "password_column_2", "ha1b") modparam("auth_db", "calculate_ha1", 1) modparam("auth_db", "use_domain", 0) modparam("auth_db", "load_credentials", "rpid") loadmodule "uri_db.so" modparam("uri_db", "db_url", "mysql://openser:XXXXXXX@localhost/openser") modparam("uri_db", "uri_table", "uri") modparam("uri_db", "uri_user_column", "username") modparam("uri_db", "uri_domain_column", "domain") modparam("uri_db", "uri_uriuser_column", "uri_user") modparam("uri_db", "subscriber_table", "subscriber") modparam("uri_db", "subscriber_user_column", "username") modparam("uri_db", "subscriber_domain_column", "domain") modparam("uri_db", "use_uri_table", 0) modparam("uri_db", "use_domain", 0) ######################################################################## # Request route 'main' ######################################################################## route[0] { xlog("L_INFO", "New request - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); force_rport(); if(msg:len > max_len) { xlog("L_INFO", "Message too big - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); sl_send_reply("513", "Message Too Big"); exit; } if (!mf_process_maxfwd_header("10")) { xlog("L_INFO", "Too many hops - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); sl_send_reply("483", "Too Many Hops"); exit; } if(!is_method("REGISTER")) { if(nat_uac_test("19")) { record_route(";nat=yes"); } else { record_route(); } } if(is_method("CANCEL") || is_method("BYE")) { end_media_session(); } if(loose_route()) { if(!has_totag()) { xlog("L_INFO", "Initial loose-routing rejected - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); sl_send_reply("403", "Initial Loose-Routing Rejected"); exit; } if(nat_uac_test("19") || search("^Route:.*;nat=yes")) { fix_nated_contact(); setflag(6); } route(3); } if(is_method("REGISTER")) { route(2); } if(is_method("INVITE")) { route(4); } if(is_method("CANCEL") || is_method("ACK")) { route(8); } route(9); } ######################################################################## # Request route 'stop-media-proxy' ######################################################################## route[1] { if(isflagset(22)) { end_media_session(); } } ######################################################################## # Request route 'base-route-register' ######################################################################## route[2] { sl_send_reply("100", "Trying"); if(!www_authorize("", "subscriber")) { xlog("L_INFO", "Register authentication failed - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); www_challenge("", "0"); exit; } if(!check_to()) { xlog("L_INFO", "Spoofed To-URI detected - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); sl_send_reply("403", "Spoofed To-URI Detected"); exit; } consume_credentials(); if(!search("^Contact:[ ]*\*") && nat_uac_test("19")) { fix_nated_register(); setflag(6); } if(!save("location")) { xlog("L_ERR", "Saving contact failed - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); sl_reply_error(); exit; } xlog("L_INFO", "Registration successful - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); exit; } ######################################################################## # Request route 'base-outbound' ######################################################################## route[3] { if(isflagset(6)) { if(!isflagset(22) && !search("^Content-Length:[ ]*0")) { setflag(22); use_media_proxy(); } t_on_reply("2"); } else { t_on_reply("1"); } if(!isflagset(21)) { t_on_failure("1"); } if(isflagset(29)) { append_branch(); } if(is_present_hf("Proxy-Authorization")) { consume_credentials(); } xlog("L_INFO", "Request leaving server, D-URI='$du' - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); if(!t_relay()) { sl_reply_error(); if(is_method("INVITE") && isflagset(6)) { end_media_session(); } } exit; } ######################################################################## # Request route 'base-route-invite' ######################################################################## route[4] { sl_send_reply("100", "Trying"); if(!proxy_authorize("", "subscriber")) { xlog("L_INFO", "Proxy authentication failed - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); proxy_challenge("", "0"); exit; } if(!check_from()) { xlog("L_INFO", "Spoofed From-URI detected - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); sl_send_reply("403", "Spoofed From-URI Detected"); exit; } if(nat_uac_test("19")) { fix_nated_contact(); setflag(6); } route(5); } ######################################################################## # Request route 'invite-find-callee' ######################################################################## route[5] { if(!is_domain_local("$ruri")) { setflag(20); route(7); } if(does_uri_exist()) { xlog("L_INFO", "Callee is local - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); route(6); } else { xlog("L_INFO", "Callee is not local - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); route(7); } exit; } ######################################################################## # Request route 'invite-to-internal' ######################################################################## route[6] { if(!lookup("location")) { xlog("L_INFO", "Local user offline - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); sl_send_reply("404", "User Offline"); } else { xlog("L_INFO", "Local user online - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); route(3); } exit; } ######################################################################## # Request route 'invite-to-external' ######################################################################## route[7] { if(isflagset(20)) { xlog("L_INFO", "Call to foreign domain - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); route(3); exit; } xlog("L_INFO", "Call to unknown user - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); sl_send_reply("404", "User Not Found"); exit; } ######################################################################## # Request route 'base-route-local' ######################################################################## route[8] { t_on_reply("1"); if(t_check_trans()) { xlog("L_INFO", "Request leaving server - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); if(!t_relay()) { sl_reply_error(); } } else { xlog("L_INFO", "Dropping mis-routed request - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); } exit; } ######################################################################## # Request route 'base-route-generic' ######################################################################## route[9] { xlog("L_INFO", "Method not supported - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); sl_send_reply("501", "Method Not Supported Here"); exit; } ######################################################################## # Request route 'base-filter-failover' ######################################################################## route[10] { if(!t_check_status("408|500|503")) { xlog("L_INFO", "No failover routing needed for this response code - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n"); route(1); exit; } } ######################################################################## # Reply route 'base-standard-reply' ######################################################################## onreply_route[1] { xlog("L_INFO", "Reply - S=$rs D=$rr F=$fu T=$tu IP=$si ID=$ci\n"); exit; } ######################################################################## # Reply route 'base-nat-reply' ######################################################################## onreply_route[2] { xlog("L_INFO", "NAT-Reply - S=$rs D=$rr F=$fu T=$tu IP=$si ID=$ci\n"); if(nat_uac_test("1")) { fix_nated_contact(); } if(isflagset(6) && status=~"(180)|(183)|2[0-9][0-9]") { if(!search("^Content-Length:[ ]*0")) { use_media_proxy(); } } exit; } ######################################################################## # Failure route 'base-standard-failure' ######################################################################## failure_route[1] { route(10); route(1); }

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[OpenSER-Users] Proxy Authorization - Two Digests
by Ash Rah 26 Apr '08

26 Apr '08

Hello, I am trying to make a design like below to work. X-Lite ----- OpenSER ----- Asterisk ----->(PSTN Calls) X-Lite registers with OpenSer and PSTN calls are routed through Asterisk from OpenSER. When a call is sent to Asterisk, Asterisk tries to authenticate the user on X-Lite. I maintain same username and password for both OpenSER and Asterisk. Now when an INVITE from X-Lite hits OpenSER, it goes through the following script and is asked for Proxy Authorization: if (!proxy_authorize("","subscriber")) { proxy_challenge("","0"); exit; } When I dial a PSTN number from X-Lite, X-Lite at some point, ends up sending two Digests (one for OpenSER and one for Atserisk) in same INVITE but gets stuck with Proxy Authorization failure (from OpenSER). If I take off the above proxy_authorize section from OpenSER script, everything works fine. Can anyone suggest a solution to this. Thanks in advance. U 2008/04/23 13:28:42.314669 110.110.110.110:26986 -> 120.120.120.120:5060 INVITE sip:6048484848484@sip.dummydomain.com SIP/2.0. Via: SIP/2.0/UDP 172.16.40.14:26986;branch=z9hG4bK-d87543-886860777744b40e-1--d87543-;rport. Max-Forwards: 70. Contact: <sip:1274229212@110.110.110.110:26986>. To: "6048484848484"<sip:6048484848484@sip.dummydomain.com>. From: "1274229212"<sip:1274229212@sip.dummydomain.com>;tag=7d74b26b. Call-ID: ZjIyNDQzOWIxZTM2MWJjMTgzNmE1YWE3ZDY1M2RjZWE.. CSeq: 3 INVITE. Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO. Content-Type: application/sdp. Proxy-Authorization: Digest username="1274229212",realm="asterisk",nonce="01d3972c",uri="sip:6048484848484@sip.dummydomain.com",response="ff9058f8ea89c55d0b110d4eccf27e9c",algorithm=MD5. Proxy-Authorization: Digest username="1274229212",realm="sip.dummydomain.com",nonce="480ee655da312e1c8f977cae40a747d26f7e9c5f",uri="sip:6048484848484@sip.dummydomain.com",response="361700cce632c00ff70ede5e5126c6ac",algo rithm=MD5. User-Agent: X-Lite release 1011s stamp 41150. Content-Length: 333. . v=0. o=- 9 2 IN IP4 172.16.40.14. s=CounterPath X-Lite 3.0. c=IN IP4 172.16.40.14. t=0 0. m=audio 45136 RTP/AVP 0 101. a=alt:1 3 : gpvy8HMY JXNZYRF+ 172.16.40.14 45136. a=alt:2 2 : 8S3XPC3M 6q9Z76Pq 192.168.38.1 45136. a=alt:3 1 : rISpUdBc PRYZ7B/8 192.168.23.1 45136. a=fmtp:101 0-15. a=rtpmap:101 telephone-event/8000. a=sendrecv. U 2008/04/23 13:28:42.314910 120.120.120.120:5060 -> 110.110.110.110:26986 SIP/2.0 407 Proxy Authentication Required. Via: SIP/2.0/UDP 172.16.40.14:26986;branch=z9hG4bK-d87543-886860777744b40e-1--d87543-;rport=26986;received=110.110.110.110. To: "6048484848484"<sip:6048484848484@sip.dummydomain.com>;tag=058e81974577b8ca6a831d36c0f6fe25.d85d. From: "1274229212"<sip:1274229212@sip.dummydomain.com>;tag=7d74b26b. Call-ID: ZjIyNDQzOWIxZTM2MWJjMTgzNmE1YWE3ZDY1M2RjZWE.. CSeq: 3 INVITE. Proxy-Authenticate: Digest realm="sip.dummydomain.com", nonce="480ee6560e7141c28e990448575d0918ce86a82d". Server: OpenSER (1.3.1-notls (i386/linux)). Content-Length: 0.

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[OpenSER-Users] interaction between msrp and openser
by Gaoqiang Qian 26 Apr '08

26 Apr '08

Hi list, Could anyone here tell me is the openser 1.3.x version support MSRP(e.g. MSRPRelay)? Is there any document describe how to configure the openser work with MSRP(MSRPRelay) as a message session switch. Does anyone have successful experience configure openser to work with the MSRP Relay. Thanks a lot. -- Gaoqiang Qian Automation System and Technology Helsinki University Of Technology GSM: +358415058138

1 0

[Serusers] Gentilini, Paul is out of the office.
by PGentilini＠intellicare.com 26 Apr '08

26 Apr '08

I will be out of the office starting 04/23/2008 and will not return until 04/29/2008.

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[Serusers] Multiple INVITEs crash Polycom phones
by Steven C. Blair 25 Apr '08

25 Apr '08

Hello: I have a case where multiple INVITEs crash Polycom phones. I'm wondering if anyone else has seen this and if so how you addressed the problem. We are using SER0.9.7pre3. We have Polycom 550s and Cisco 7960s running SIP 2.2.2.0084 and 7.3 respectively. These phones are configured for simultaneous/parallel ringing which we call a ring group. In a ring group the same 5-digit extension appears on each phone. So in this case the AOR has three contact addresses in the location table. When a call arrives for the AOR all three phones ring and if you answer one of them at least one, possible all, Polycom phones will reboot. Ngrep traces on the proxy show multiple invites being sent to each phone each with a different branch tag in the Via header. I'm not sure what is happening so any insight anyone can share will be appreciated. Polycom admits the reboot is a bug but believes the multiple invites is a configuration problem in our proxy. My questions is where and why does this only cause a problem for Polycom phones? Thanks,steve Senior Network Engineer, Information Systems and Computing Networking and Telecommunications , Suite 221A /6228 University of Pennsylvania Voice:215-573-8396 FAX:215-898-9348

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sr-users April 2008