On Thu, May 25, 2017 at 5:17 PM, Cristi Constantin <cristi.constantin@gmail.com> wrote:

Hi Daniel,

I attached a pcap trace. It contains several SIP messages, but please check the INVITEs from 10.224.74.36 (Kamailio) to 10.126.54.51/10.126.55.51.

Thanks for you support,

Cristian

On Thu, May 25, 2017 at 5:04 PM, Daniel-Constantin Mierla <miconda@gmail.com> wrote:

Hello,

can you sent pcap or ngrep output with all sip messages of such case exposing the issue you have?

Cheers,
Daniel

On Thu, May 25, 2017 at 2:18 PM, Cristi Constantin <cristi.constantin@gmail.com> wrote:

Hello,

I have an issue with the behavior of ds_select_dst() method in case of using algorithm 8 (dispatch based on priority). In case both destinations are available, they are used alternatively, instead of always using the one with the highest priority.

By searching through the mailing list I found that the lower the priority number, the higher the priority (1 is first, 2 is second, etc.).

Based on this, I set the following in dispatcher.list:

7 sip:10.126.54.51:5060;transport=sctp 9 1

7 sip:10.126.55.51:5060;transport=sctp 9 2

After running "kamcmd dispatcher.reload" and "kamcmd dispatcher.list", I have the confirmation that the priorities are correctly set:

SET: {

ID: 7

TARGETS: {

DEST: {

URI: sip:10.126.55.51:5060;transport=sctp

FLAGS: AP

PRIORITY: 2

}

DEST: {

URI: sip:10.126.54.51:5060;transport=sctp

FLAGS: AP

PRIORITY: 1

}

}

}

The dispatcher settings from kamailio.cfg is the following:

modparam("dispatcher", "list_file", "/etc/kamailio/dispatcher.list")

modparam("dispatcher", "flags", 2)

modparam("dispatcher", "ds_ping_interval", 10)

modparam("dispatcher", "ds_ping_method", "OPTIONS")

modparam("dispatcher", "ds_ping_from", "sip:kamailio@sdp-t-lb2")

modparam("dispatcher", "ds_probing_mode", 3)

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)")

And the code which should do the displatch is the following:

if (ds_is_from_list(7, 3, "$ru")) {

remove_hf("Route");

if(!ds_select_dst("7", "8")) {

send_reply("404", "No destination");

exit;

}

}

With the settings above, I was expecting to always have the messages delivered to 10.126.54.51. Instead, they are dispathed to 10.126.54.51 and 10.126.55.51 alternatively.

Thanks a lot,

Cristian

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Daniel-Constantin Mierla - http://www.asipto.com

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