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Kamailio stops processing UDP on one interface
by Ihor Olkhovskyi 30 Aug '23

30 Aug '23

Hello, I've faced a bit strange issue, but a bit of preface. I have Kamailio as a proxy (TLS/WS <-> UDP) and second Kamailio as a presence server. At some point presence server accepts around 5K PUBLISH within 1 minute and sending around the same amount of NOTIFY to proxy Kamailio. Proxy is "transforming" protocol to TLS, but at sime point I'm starting to get these type of errors tm [../../core/forward.h:292]: msg_send_buffer(): tcp_send failed tm [t_fwd.c:1588]: t_send_branch(): sending request on branch 0 failed <script>: [RELAY] Relay to <sip:X.X.X.X:51571;transport=tls> failed! tm [../../core/forward.h:292]: msg_send_buffer(): tcp_send failed tm [t_fwd.c:1588]: t_send_branch(): sending request on branch 0 failed Some of those messages are 100% valid as client can go away or so. Some are not, cause I'm sure client is alive and connected. But the problem comes later. At some moment proxy Kamailio just stops accept UDP traffic on this interface (where it also accepts all NOTIFY's), at the start of the "stopping accepting" Kamailio sends OPTIONS via DISPATCHER but not able to receive 200 OK. Over TLS on the same interface all is ok. On other (loopback) interface UDP is being processed fine, so I don't suspert some limit on open files here. Only restart of Kamailio proxy process helps in this case. I've tuned net.core.rmem_max and net.core.rmem_default to 25 Mb, so in theory buffer should not be the case. Is there some internal "interface buffer" in Kamailio that is not freed upon failure send or maybe I've missed somethig? Kamailio 5.6.4 fork=yes children=12 tcp_children=12 enable_tls=yes tcp_accept_no_cl=yes tcp_max_connections=63536 tls_max_connections=63536 tcp_accept_aliases=no tcp_async=yes tcp_connect_timeout=10 tcp_conn_wq_max=63536 tcp_crlf_ping=yes tcp_delayed_ack=yes tcp_fd_cache=yes tcp_keepalive=yes tcp_keepcnt=3 tcp_keepidle=30 tcp_keepintvl=10 tcp_linger2=30 tcp_rd_buf_size=80000 tcp_send_timeout=10 tcp_wq_blk_size=2100 tcp_wq_max=10485760 open_files_limit=63536 Sysctl # To increase the amount of memory available for socket input/output queues net.ipv4.tcp_rmem = 4096 25165824 25165824 net.core.rmem_max = 25165824 net.core.rmem_default = 25165824 net.ipv4.tcp_wmem = 4096 65536 25165824 net.core.wmem_max = 25165824 net.core.wmem_default = 65536 net.core.optmem_max = 25165824 # To limit the maximum number of requests queued to a listen socket net.core.somaxconn = 128 # Tells TCP to instead make decisions that would prefer lower latency. net.ipv4.tcp_low_latency=1 # Optional (it will increase performance) net.core.netdev_max_backlog = 1000 net.ipv4.tcp_max_syn_backlog = 128 # Flush the routing table to make changes happen instantly. net.ipv4.route.flush=1 -- Best regards, Ihor (Igor)

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[OT] Code 868 reply to SIP OPTIONS ?
by Olivier 30 Aug '23

30 Aug '23

Hello, Have you ever seen a SIP device replying with code 868 to a SIP OPTIONS request ? Best regards

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How to forward 480
by Anthony Blandin 29 Aug '23

29 Aug '23

Hello, I have a Kamailio SBC connected to another foreign SBC and to a media server. In case of non response, Kamailio SBC receives a 480 Temporarily not available from the foreign SBC and I need to forward this 480 to my media server but I don't see how to do that. The 480 arrives in the onreply_route. If I use then a failure_route, it resends the initial INVITE and not the 480. Is there a way to do that? Thanks for your help. Anthony Blandin

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Re: extreme dildoes
by Angel Elena 27 Aug '23

27 Aug '23

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1 0

extreme dildoes
by feigelwang＠uusextoy.com 27 Aug '23

27 Aug '23

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6 5

large dildo
by feigelwang＠uusextoy.com 26 Aug '23

26 Aug '23

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1 0

large dildo
by feigelwang＠uusextoy.com 26 Aug '23

26 Aug '23

1 0

extreme dildoes
by feigelwang＠uusextoy.com 26 Aug '23

26 Aug '23

1 0

rtpengine large number used RTP ports
by marek 25 Aug '23

25 Aug '23

hi, i have open around ~8000 rtp ports for around ~200calls (in peak) with this statistic (current data, not from peak) rtpengine_closed_sessions_total{reason="rejected"} 0 rtpengine_closed_sessions_total{reason="timeout"} 237405 rtpengine_closed_sessions_total{reason="silent_timeout"} 103 rtpengine_closed_sessions_total{reason="final_timeout"} 0 rtpengine_closed_sessions_total{reason="offer_timeout"} 0 rtpengine_closed_sessions_total{reason="terminated"} 0 rtpengine_request_seconds_total{proxy="127.0.0.1",request="offer"} 539.270967 rtpengine_request_seconds_total{proxy="127.0.0.1",request="answer"} 367.237641 rtpengine_request_seconds_total{proxy="127.0.0.1",request="delete"} 0.000000 is it normal? (large number of timeouts, "zero" terminated) or i have missing rtpengine_manage (rtpengine_delete) somewhere? (os rocky 9.2, kamailio 5.6.4, rtpengine 11.3.1) thanks Marek

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excessive CANCELs
by James Lipski 23 Aug '23

23 Aug '23

Hello, I've already suppressed this via routing logic, however I was wondering if there is a dedicated parameter that handles this. I'm currently running version 5.6.4. Scenario: UA-1 registered towards kamailio, calls UA-2 which is registered towards a different platform (non kamailio); so there are 2 proxys involved. kamailio is set to fork the call to voicemail if there is either no response completely from the other end, or the call goes unanswered. So the initial leg is: UA-1 <-----> kamailio <-----> second proxy <-----> UA-2 Issue: I'm trying to catch a case where the second proxy does issue a "100 Trying" for the initial INVITE; and then timesout. The call does fork to voicemail; however 14000+ SIP packets are generated between kamailio and the second proxy of CANCEL and "100 Trying" (the 100 Trying has a CSeq for INVITE still). Is there a way to suppress the amount of CANCELs that is transmitted in this situation? I'm using the following as my "tm" parameters: modparam("tm", "failure_reply_mode", 3) modparam("tm", "fr_timer", 30000) modparam("tm", "fr_inv_timer", 300000) modparam("tm", "auto_inv_100_reason", "Trying") Thanks. Example SIP trace: (UA-1 --> kamailio) 72.255.255.255 --> 10.64.52.110 INVITE sip:131@sip-example.com SIP/2.0 v: SIP/2.0/UDP 10.0.0.102:51519;branch=z9hG4bK-xfelmyyjzne5;rport f: <sip:133@sip-example.com>;tag=i4mlq4jr0y t: <sip:131@sip-example.com> i: 95c3e4642670-rx28v46dte4p CSeq: 1 INVITE Max-Forwards: 70 User-Agent: snomD785/10.1.152.12 m: <sip:133@10.0.0.102:51519;line=6dv00d6r>;reg-id=1 Accept: application/sdp Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE, PRACK, MESSAGE, INFO, UPDATE Allow-Events: talk, hold, refer, call-info Supported: timer, replaces, from-change Session-Expires: 3600 Min-SE: 90 Proxy-Authorization: Digest username="133",realm="sip-example.com",nonce="ZOTEBGTkwtiM22ZE8IJsn/esiW3CZrt0"[,uri="sip:131@sip-example.com](mailto:,uri=)",response="fb44b4fe0f8fb17de13f043cf1248e14",algorithm=MD5 c: application/sdp l: 309 v=0 o=root 481174289 481174289 IN IP4 10.0.0.102 s=call c=IN IP4 10.0.0.102 t=0 0 m=audio 50864 RTP/AVP 9 0 8 18 101 a=rtpmap:9 G722/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:18 G729/8000 a=fmtp:18 annexb=no a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=ptime:20 a=sendrecv -------------------------------------------- (UA-1 <-- kamailio) 72.255.255.255 <-- 10.64.52.110 SIP/2.0 100 Trying v: SIP/2.0/UDP 10.0.0.102:51519;branch=z9hG4bK-xfelmyyjzne5;rport=51519;received=72.255.255.255 f: <sip:133@sip-example.com>;tag=i4mlq4jr0y t: <sip:131@sip-example.com> i: 95c3e4642670-rx28v46dte4p CSeq: 1 INVITE Content-Length: 0 -------------------------------------------- (kamailio --> second proxy) 10.64.52.110 --> 10.64.52.100 INVITE sip:second-proxy-example.com:5066;ua=43a58ecca39c9c8f37515e55b5b37ed7 SIP/2.0 Via: SIP/2.0/UDP 10.64.52.110:5060;branch=z9hG4bKecf9.6d10880e1353b8a7bbf0383d934a38a5.0 f: <sip:133@sip-example.com>;tag=i4mlq4jr0y t: <sip:131@sip-example.com?vm-ext%3D100%26ext-to%3D131%26ext-from%3D133> i: 95c3e4642670-rx28v46dte4p CSeq: 1 INVITE Max-Forwards: 15 Accept: application/sdp Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE, PRACK, MESSAGE, INFO, UPDATE Allow-Events: talk, hold, refer, call-info Supported: timer, replaces, from-change Session-Expires: 3600 Min-SE: 90 c: application/sdp l: 313 Contact: <sip:leg_1@sip-example.com;ccr=btpsh-64e387e0-ee528-2> v=0 o=root 481174289 481174289 IN IP4 10.64.52.111 s=call c=IN IP4 10.64.52.111 t=0 0 m=audio 34084 RTP/AVP 9 0 8 18 101 a=rtpmap:9 G722/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:18 G729/8000 a=fmtp:18 annexb=no a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=ptime:20 a=sendrecv -------------------------------------------- (kamailio <-- second proxy) 10.64.52.110 <-- 10.64.52.100 SIP/2.0 100 Trying v: SIP/2.0/UDP 10.64.52.110:5060;branch=z9hG4bKecf9.6d10880e1353b8a7bbf0383d934a38a5.0 f: <sip:133@sip-example.com>;tag=i4mlq4jr0y t: <sip:131@sip-example.com?vm-ext%3D100%26ext-to%3D131%26ext-from%3D133> i: 95c3e4642670-rx28v46dte4p CSeq: 1 INVITE l: 0 -------------------------------------------- After 10 seconds of no further response from second proxy, call is forked to voicemail (kamailio --> voicemail) 10.64.52.110 --> 10.64.56.10 INVITE sip:voicemail@voicemail-example.com SIP/2.0 Via: SIP/2.0/UDP 10.64.52.110:5060;branch=z9hG4bKecf9.6d10880e1353b8a7bbf0383d934a38a5.1 f: <sip:133@sip-example.com>;tag=i4mlq4jr0y t: <sip:131@sip-example.com?vm-ext%3D100%26ext-to%3D131%26ext-from%3D133> i: 95c3e4642670-rx28v46dte4p CSeq: 1 INVITE Max-Forwards: 15 Accept: application/sdp Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE, PRACK, MESSAGE, INFO, UPDATE Allow-Events: talk, hold, refer, call-info Supported: timer, replaces, from-change Session-Expires: 3600 Min-SE: 90 c: application/sdp l: 313 Contact: <sip:leg_1@sip-example.com;ccr=btpsh-64e387e0-ee533-3> v=0 o=root 481174289 481174289 IN IP4 10.64.52.111 s=call c=IN IP4 10.64.52.111 t=0 0 m=audio 38722 RTP/AVP 9 0 8 18 101 a=rtpmap:9 G722/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:18 G729/8000 a=fmtp:18 annexb=no a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=ptime:20 a=sendrecv -------------------------------------------- At roughly the same time, CANCEL is issued towards the second proxy (kamailio --> second proxy) 10.64.52.110 --> 10.64.52.100 CANCEL sip:second-proxy-example.com:5066;ua=43a58ecca39c9c8f37515e55b5b37ed7 SIP/2.0 Via: SIP/2.0/UDP 10.64.52.110:5060;branch=z9hG4bKecf9.6d10880e1353b8a7bbf0383d934a38a5.0 f: <sip:133@sip-example.com>;tag=i4mlq4jr0y t: <sip:131@sip-example.com> i: 95c3e4642670-rx28v46dte4p CSeq: 1 CANCEL Max-Forwards: 15 l: 0 -------------------------------------------- (kamailio <-- voicemail) 10.64.52.110 <-- 10.64.56.10 SIP/2.0 200 Ok Via: SIP/2.0/UDP 10.64.52.110:5060;branch=z9hG4bKecf9.6d10880e1353b8a7bbf0383d934a38a5.1 From: <sip:133@sip-example.com>;tag=i4mlq4jr0y To: <sip:131@sip-example.com?vm-ext%3D100%26ext-to%3D131%26ext-from%3D133>;tag=vzx5x3mlbd Call-ID: 95c3e4642670-rx28v46dte4p CSeq: 1 INVITE Contact: <sip:voicemail@10.64.56.10:5078> Require: timer Session-Expires: 3600;refresher=uac Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE, PRACK, MESSAGE, INFO Supported: timer, 100rel, replaces Content-Type: application/sdp Content-Length: 264 v=0 o=root 1084843702 1084843703 IN IP4 10.64.56.10 s=call c=IN IP4 10.64.56.10 t=0 0 m=audio 31908 RTP/AVP 0 101 a=rtpmap:0 pcmu/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=ptime:20 a=alt:1 0.9 : user 9kksj== 10.64.56.10 31908 a=sendrecv -------------------------------------------- (UA-1 <-- kamailio) 72.255.255.255 <-- 10.64.52.110 SIP/2.0 200 Ok From: <sip:133@sip-example.com>;tag=i4mlq4jr0y To: <sip:131@sip-example.com?vm-ext%3D100%26ext-to%3D131%26ext-from%3D133>;tag=vzx5x3mlbd Call-ID: 95c3e4642670-rx28v46dte4p CSeq: 1 INVITE Require: timer Session-Expires: 3600;refresher=uac Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE, PRACK, MESSAGE, INFO Supported: timer, 100rel, replaces Content-Type: application/sdp Content-Length: 270 Via: SIP/2.0/UDP 10.0.0.102:51519;received=72.255.255.255;branch=z9hG4bK-xfelmyyjzne5;rport=51519 Contact: <sip:leg_2@sip-example.com;ccr=atpsh-64e387e0-ee533-3> v=0 o=root 1084843702 1084843703 IN IP4 10.64.52.110 s=call c=IN IP4 10.64.52.110 t=0 0 m=audio 33552 RTP/AVP 0 101 a=rtpmap:0 pcmu/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=ptime:20 a=alt:1 0.9 : user 9kksj== 10.64.56.10 31908 a=sendrecv =============================================== These next 2 SIP packets repeat, generating 14000+ CANCEL <--> 100 Trying transactions between kamailio, and the second proxy. (kamailio --> second proxy) 10.64.52.110 --> 10.64.52.100 CANCEL sip:second-proxy-example.com:5066;ua=43a58ecca39c9c8f37515e55b5b37ed7 SIP/2.0 Via: SIP/2.0/UDP 10.64.52.110:5060;branch=z9hG4bKecf9.6d10880e1353b8a7bbf0383d934a38a5.0 f: <sip:133@sip-example.com>;tag=i4mlq4jr0y t: <sip:131@sip-example.com> i: 95c3e4642670-rx28v46dte4p CSeq: 1 CANCEL Max-Forwards: 15 l: 0 -------------------------------------------- (kamailio <-- second proxy) 10.64.52.110 <-- 10.64.52.100 SIP/2.0 100 Trying v: SIP/2.0/UDP 10.64.52.110:5060;branch=z9hG4bKecf9.6d10880e1353b8a7bbf0383d934a38a5.0 f: <sip:133@sip-example.com>;tag=i4mlq4jr0y t: <sip:131@sip-example.com?vm-ext%3D100%26ext-to%3D131%26ext-from%3D133> i: 95c3e4642670-rx28v46dte4p CSeq: 1 INVITE l: 0

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