[SR-Users] Question regarding Dispatcher + ds_default_socket() modparam + Call-ID generation

Henning Westerholt hw at skalatan.de
Wed Aug 14 18:32:01 CEST 2019

Hello Joel,

funny - I just had this discussion about the same topic some days ago.

In the end this is "only" the call-id, the IP should not be used to to routing descisions etc.. Do you have some more concerns about this?

I think as well it just uses the first IP. I think at the moment the call-id is generated internally from tm, but this could be of course changed for the module with some coding/extension.



Am 14.08.19 um 17:12 schrieb Joel Serrano:

Simple doubt regarding dispatcher module when you have the ds_default_socket() modparam set:

Say you have 2 kamailio boxes, active + passive, one shared IP via keepalived.... On the actrive node, you have dispatcher.send_ping to 1, and the passive has it set to 0.

So far OK, only the active box is sending out probing OPTIONS requests, and it's using as outbound socket the virtual IP out of all the available ones (as defined with ds_default_socket() modparam)

I have seen in a capture that the outbound OPTIONS look like:

OPTIONS sip:<> SIP/2.0
Via: SIP/2.0/UDP A.B.C.180;branch=z9hG4bK7abb.6fbaccc1000000000000000000000000.0
To: <sip:<>>
From: <sip:dspinger at my.domain><mailto:sip:dspinger at my.domain>;tag=e2bdd495733c59fd91487a137fccad4e-8a73
Call-ID: 2019f8491329c382-31419 at A.B.C.181
Max-Forwards: 70
Content-Length: 0

A.B.C.180 -> VRRP
A.B.C.181 -> Physical IP of the box

My doubt is, shouldn't ds_default_socket also update the IP used to generate the Call-ID used in the OPTIONS request? Currently, I believe it's using the first defined listen= IP from config script as I switched the order the listen= are defined and I get the desired result:

OPTIONS sip:<> SIP/2.0
Via: SIP/2.0/UDP A.B.C.180;branch=z9hG4bKc97e.a8d9e1c2000000000000000000000000.0
To: <sip:<>>
From: <sip:dspinger at my.domain><mailto:sip:dspinger at my.domain>;tag=5e2e1773f812f6a7e4085c5d036e29d8-d323
Call-ID: 7d9a92c218fc1ba0-32111 at A.B.C.180
Max-Forwards: 70
Content-Length: 0

Is this expected?


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