If you are not sure that keepalives are configured properly or next hop
gateways can reply promptly to OPTIONS keepalives, then just let
dispatcher route calls anyhow to gateways and set a low value for
retransmission timeout (see t_set_fr() from tm module). I noticed some
old gateways forget to send reply to OPTIONS from time to time.
You can also add event_route[...] blocks exposed by dispatcher module in
kamailio.cfg and trigger alerts when a destination is detected
inactive/back-active, making it easier to monitor what happens there.
Cheers,
Daniel
On 08.10.20 15:29, Sergio Charrua wrote:
> Sorry for the late reply....
>
> the dispatcher is set as follows:
>
> # ----- dispatcher params -----
> modparam("dispatcher", "list_file", DS_LIST)
> modparam("dispatcher", "flags", 2)
> modparam("dispatcher", "dst_avp", "$avp(AVP_DST)")
> modparam("dispatcher", "grp_avp", "$avp(AVP_GRP)")
> modparam("dispatcher", "cnt_avp", "$avp(AVP_CNT)")
> modparam("dispatcher", "sock_avp", "$avp(AVP_SOCK)")
> modparam("dispatcher", "ds_hash_size", 9)
> modparam("dispatcher", "dstid_avp", "$avp(dsdstid)")
> modparam("dispatcher", "ds_ping_latency_stats", 1)
>
> I think it is correct, though what I wish is to set dispatcher on Load
> Balancing mode.
>
> This is my dispatcher.list :
> 1 sip:10.19.XXX.YYY:5060 0 1 duid=sipgw01;maxload=100
> 1 sip:10.19.XXX.YYY:5060 0 2 duid=sipgw02;maxload=100
> 1 sip:10.19.XXX.YYY:5060 0 3 duid=sipgw03;maxload=100
> 1 sip:10.19.XXX.YYY:5060 0 4 duid=sipgw04;maxload=100
>
> This is my dispatch routes:
> # Dispatch requests
> route[DISPATCH] {
>
> if(!ds_select_dst("1", "10","4"))
> {
> xlog("L_INFO","no destination selected from dispatcher
> list!");
> send_reply("404", "No destination");
> exit;
> }
>
> xlog("L_INFO","going to <$ru> via <$du>\n");
>
> t_on_failure("RTF_DISPATCH");
> route(RELAY);
>
> exit;
>
> }
>
> Any clue?
>
> *Sérgio Charrua*
>
> *
> *
>
> *www.voip.pt <http://www.voip.pt/>*
> Tel.: +351 <callto:+351+91+104+12+66>21 130 71 77
>
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> On Thu, Sep 17, 2020 at 3:49 AM Arsen Semenov <[email protected]
> <mailto:[email protected]>> wrote:
>
>
> Hi Sergio,
>
> Make sure your dispatcher probing parameters are set correctly.
> (reply codes as well).
>
> And if it happens again you can catch OPTIONS traffic with sngrep
> "CSeq: [0-9]+ OPTIONS"
> and see what happens on this level.
> Whether Kamailio does send pings, whether replies from gw are the
> same as expected, etc.
>
>
> Regards,
>
> On Wed, Sep 16, 2020 at 5:55 PM David Villasmil
> <[email protected]
> <mailto:[email protected]>> wrote:
>
> Hello
>
> I would start by looking at the logs when that happens. The
> gateway would only get marked "ip" when there is no reply by
> the gateway or when it replies with 500. Also OPTIONs not
> being replied promptly.
> Maybe add some logging right before ds_mark_dst("ip").
>
> Hope that helps,
>
> Regards,
>
> David Villasmil
> email: [email protected]
> <mailto:[email protected]>
> phone: +34669448337
>
>
> On Wed, Sep 16, 2020 at 11:40 AM Sergio Charrua
> <[email protected] <mailto:[email protected]>> wrote:
>
> Hello,
>
> Using Kamailio 5.1.6 for load balancing & failover,
> I noticed that from time to time, and very rarely, the
> dispatcher module stops dispatching to the Asterisk servers.
> I have to execute a "kamcmd dispatcher reload" for it to
> (re)start working.
>
> This is my dispatcher.list :
> 1 sip:10.19.XXX.YYY:5060 0 1 duid=sipgw01;maxload=100
> 1 sip:10.19.XXX.YYY:5060 0 2 duid=sipgw02;maxload=100
> 1 sip:10.19.XXX.YYY:5060 0 3 duid=sipgw03;maxload=100
> 1 sip:10.19.XXX.YYY:5060 0 4 duid=sipgw04;maxload=100
>
> This is my dispatch routes:
> # Dispatch requests
> route[DISPATCH] {
>
> if(!ds_select_dst("1", "10","4"))
> {
> xlog("L_INFO","no destination selected
> from dispatcher list!");
> send_reply("404", "No destination");
> exit;
> }
>
> xlog("L_INFO","going to <$ru> via <$du>\n");
>
> t_on_failure("RTF_DISPATCH");
> route(RELAY);
>
> exit;
>
> }
>
> # Sample failure route
> failure_route[RTF_DISPATCH] {
> if (t_is_canceled()) {
> exit;
> }
> xlog("L_INFO", "Media server $du failed to answer,
> selecting other one!");
> # next DST - only for 500 or local timeout
> if ( t_check_status("500") || (t_branch_timeout()
> && !t_branch_replied()) )
> {
> #mark the destination Inactive and Probing
> ds_mark_dst("ip");
> if(ds_next_dst())
> {
> t_on_failure("RTF_DISPATCH");
> route(RELAY);
> exit;
> }
> }
> }
>
> I suspect that the ds_mark_dst("ip") command in
> RTF_DISPACTH is the cause.
> Is there any think I can improve on this? Or any know bug
> with the dispatcher in Kamailio 5.1.6 version?
>
> Thanks in advance,
>
> *Sérgio Charrua*
>
>
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>
> --
> Arsen Semenov
>
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