[SR-Users] DMQ with dialog: KDMQ messages being looped back to the source

[Patrick Murphy]

Thanks Charles!


This has resolved the issue.


Regards

Pat.

________________________________
From: sr-users <sr-users-bounces at lists.kamailio.org> on behalf of Charles Chance <charles.chance at sipcentric.com>
Sent: Thursday, July 26, 2018 1:01:22 PM
To: Kamailio (SER) - Users Mailing List
Subject: Re: [SR-Users] DMQ with dialog: KDMQ messages being looped back to the source

Hello,

I have just pushed a fix to master branch and also backported to 5.1.

https://github.com/kamailio/kamailio/commit/a84a3ea618f0e602a8892c37fce7f4e72ab7371c
https://github.com/kamailio/kamailio/commit/e2eda1376def48ab1c78db7a766c1811d19205be

Please confirm if it fixes your issue.

Cheers,

Charles


On 25 July 2018 at 10:31, Patrick Murphy <patmurph7 at outlook.com<mailto:patmurph7 at outlook.com>> wrote:

Another bit of data:

KDMQ messages flow in the wrong direction i.e. (Node B to A) only for dialog state: 5 updates.

And this happens after the actual KDMQ from A to B has already been ack'd with a 200 OK.

________________________________
From: sr-users <sr-users-bounces at lists.kamailio.org<mailto:sr-users-bounces at lists.kamailio.org>> on behalf of Patrick Murphy <patmurph7 at outlook.com<mailto:patmurph7 at outlook.com>>
Sent: Tuesday, July 24, 2018 4:43:28 PM

To: Kamailio (SER) - Users Mailing List
Subject: Re: [SR-Users] DMQ with dialog: KDMQ messages being looped back to the source


Hi Charles,


Yes I exit after the handle_dmq function in the request route.


I couldn't spot the looping this time (as it is intermittent), but here is the trace of messages that may indicate something weird or unexpected happening with DMQ:

The following message came from Node B to A (which should never have originated because only A is receiving calls). I am assuming KDMQ will only flow from A --> B followed by their acks from B.

KDMQ sip:dialog at no.de.a.ip:5060 SIP/2.0
Via: SIP/2.0/UDP xx.xx.xx.xx:5060;branch=z9hG4bK22af.6d4559b5000000.0
To: <sip:dialog at no.de.a.ip:5060>
From: <sip:dialog at no.de.b.ip:5060>;tag=4d8de1338e3b915c083406d1267d5e7bg-1424
CSeq: 10 KDMQ
Call-ID: 7db853960276b4a4-20185 at no.de<mailto:7db853960276b4a4-20185 at no.de>.a.ip
Content-Length: 50
User-Agent: kamailio (5.1.1 (x86_64/linux))
Max-Forwards: 1
Content-Type: application/json

{"action":3,"h_entry":3521,"h_id":23807,"state":5}


And Node A correctly responded with a 500 because it was not expecting this

SIP/2.0 500 Server Internal Error
Via: SIP/2.0/UDP xx.xx.xx.xx:5060;branch=z9hG4bK22af.6d4559b5000000.0;received=no.de.b.ip
To: <sip:dialog at no.de.a.ip:5060>;tag=7bf3c29789337c2087fcbd4083b8683d.147f
From: <sip:dialog at no.de.b.ip:5060>;tag=4d8de1338e3b915c083406d1267d5e7bg-1424
CSeq: 10 KDMQ
Call-ID: 7db853960276b4a4-20185 at no.de<mailto:7db853960276b4a4-20185 at no.de>.b.ip
User-Agent: kamailio (5.1.1 (x86_64/linux))
Content-Length: 0




Regards,

Owais


________________________________
From: sr-users <sr-users-bounces at lists.kamailio.org<mailto:sr-users-bounces at lists.kamailio.org>> on behalf of Charles Chance <charles.chance at sipcentric.com<mailto:charles.chance at sipcentric.com>>
Sent: Tuesday, July 24, 2018 3:46 PM
To: Kamailio (SER) - Users Mailing List
Subject: Re: [SR-Users] DMQ with dialog: KDMQ messages being looped back to the source

Hi Pat,

In your config, do you exit immediately after handle_dmq_message()?

Are you able to share with us one of the looped messages, both as it is received by B and then as it is sent back to A?

Cheers,

Charles


On 24 July 2018 at 16:05, Patrick Murphy <patmurph7 at outlook.com<mailto:patmurph7 at outlook.com>> wrote:
Hi,

I am using Kamailio 5.1.1 with DMQ with the following config (relevant parts) on 2 nodes.

Node A:
modparam("dialog", "enable_dmq", 1)
modparam("dmq", "server_address", "sip:no.de.a.ip:5060")
modparam("dmq", "notification_address", "sip:myvoip.local")
modparam("dmq", "multi_notify", 1)


Node B:
modparam("dialog", "enable_dmq", 1)
modparam("dmq", "server_address", "sip:no.de.b.ip:5060")
modparam("dmq", "notification_address", "sip:myvoip.local")
modparam("dmq", "multi_notify", 1)

"myvoip.local" is a DNS A record that resolves to both the IPs of A and B.

I have the dmq_handle_message(); called if method is of type "KDMQ" in the request_route.

Now, in order to test it, I only sent a few calls only on node A.
KDMQ messages flowed to node B and dialog state replicated. But I noticed, node B was randomly sending one of the KDMQ dialog messages back to A and receiving a 500 "Server Internal Error" back from node A... (for a subset of those calls, not all).

Why would this be the case when the nodes correctly recognize their local status by the "local: 1" set as seen from dmq.list_nodes

Anyone else experienced this? What could I be doing wrong?


Thanks,
Pat.


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