[SR-Users] CSeq not incrementing - app_ruby

Tue Apr 30 21:06:48 CEST 2019

Hello Andrew,

It seems indeed that the dialog is not found, and therefore the cseq can't be incremented.

just to make sure there is no obvious error - you actually set the dlg_flag 4 in the proper place in the configuration - e.g. for initial dialog forming requests?

Cheers,

Henning

Am 29.04.19 um 13:01 schrieb Andrew White:
Hi Henning/Karsten,

Thanks so much for your feedback.

@Henning - you’re right, I’ve misunderstood the purpose of cseq_diff. Thanks for pointing that out, I’ve removed that reference!

I’ve done a debug and privatised a few values (IPs, phone numbers, passwords, etc):

https://0bin.net/paste/yjXiQF4-IO7HSRvE#xdrfRXGjGG0TOA6VYV0iy49IuOSUFuMghz7cyUK1fhO

Flow of the call:

A (Originating client) -> B (Kamailio) -> C (Provider)

5.6.7.8: A
1.2.3.4: B (Public IP, advertise)
10.0.1.2: B (Private IP)
0400123123: Phone number being dialed
siptrunk.provider.local: C

I don’t understand the dialog module well, however it appears the auth header is created around line 456.

The lines below that read as follows:

DEBUG: {1 102 INVITE 504966da0d624fd85a04e68a62c945f5 at 5.6.7.8<mailto:504966da0d624fd85a04e68a62c945f5 at 5.6.7.8>:5060} dialog [dlg_cseq.c:59]: dlg_cseq_prepare_msg(): prepare msg for cseq update operations
DEBUG: {1 102 INVITE 504966da0d624fd85a04e68a62c945f5 at 5.6.7.8<mailto:504966da0d624fd85a04e68a62c945f5 at 5.6.7.8>:5060} dialog [dlg_cseq.c:145]: dlg_cseq_update(): initiating cseq updates
DEBUG: {1 102 INVITE 504966da0d624fd85a04e68a62c945f5 at 5.6.7.8<mailto:504966da0d624fd85a04e68a62c945f5 at 5.6.7.8>:5060} dialog [dlg_hash.c:778]: internal_get_dlg(): no dialog callid='504966da0d624fd85a04e68a62c945f5 at 5.6.7.8<mailto:callid='504966da0d624fd85a04e68a62c945f5 at 5.6.7.8>:5060' found
DEBUG: {1 102 INVITE 504966da0d624fd85a04e68a62c945f5 at 5.6.7.8<mailto:504966da0d624fd85a04e68a62c945f5 at 5.6.7.8>:5060} dialog [dlg_hash.c:813]: get_dlg(): no dialog callid='504966da0d624fd85a04e68a62c945f5 at 5.6.7.8<mailto:callid='504966da0d624fd85a04e68a62c945f5 at 5.6.7.8>:5060' found
DEBUG: {1 102 INVITE 504966da0d624fd85a04e68a62c945f5 at 5.6.7.8<mailto:504966da0d624fd85a04e68a62c945f5 at 5.6.7.8>:5060} dialog [dlg_handlers.c:1224]: dlg_lookup_msg_dialog(): dlg with callid '504966da0d624fd85a04e68a62c945f5 at 5.6.7.8<mailto:504966da0d624fd85a04e68a62c945f5 at 5.6.7.8>:5060' not found
DEBUG: {1 102 INVITE 504966da0d624fd85a04e68a62c945f5 at 5.6.7.8<mailto:504966da0d624fd85a04e68a62c945f5 at 5.6.7.8>:5060} dialog [dlg_cseq.c:151]: dlg_cseq_update(): no dialog for this request

This reads to me like the dialog wasn’t tracked, and as it can’t find it, it isn’t incrementing it. Is that correct?

The first reference I can see to dialog is on line 135, which is quite similar:

DEBUG: {1 102 INVITE 504966da0d624fd85a04e68a62c945f5 at 5.6.7.8<mailto:504966da0d624fd85a04e68a62c945f5 at 5.6.7.8>:5060} dialog [dlg_hash.c:778]: internal_get_dlg(): no dialog callid='504966da0d624fd85a04e68a62c945f5 at 5.6.7.8<mailto:callid='504966da0d624fd85a04e68a62c945f5 at 5.6.7.8>:5060’ found

This makes me thing that the dialog isn’t being created in the first place. However I have the dlg_flag enabled in kamailio.cfg:

modparam("dialog", "dlg_flag", 4)
modparam("dialog", "track_cseq_updates", 1)
modparam("dialog", "event_callback", "ksr_dialog_event")

I’ve had a good read through the dialog module docs, and it appears setting the dlg_flag should enable dialog creation during the initial request. Have I missed setting something here?

Thanks!

Andrew

On 28 Apr 2019, at 10:29 am, Henning Westerholt <hw at skalatan.de<mailto:hw at skalatan.de>> wrote:

Hello,

why do you set the variable cseq_diff to 1? From the module README:

"The CSeq difference is stored in $dlg_var(cseq_diff), be sure this variable is not overwritten via config operation."

A suggestion would be to test this with DBG log level, so see if the dialog module is logging something related to the CSEQ update code path. There is some log output that should be visible.

Cheers,

Henning

Am 27.04.19 um 18:27 schrieb Karsten Horsmann:
Hi,

AFAIK the uac module don't support cseq autoupdate.

CSeq is not increased automatically by uac_auth() during authentication - the follow up request may be rejected. CSeq can be increased when authenticating INVITE requests - dialog module has to be used, with CSeq tracking feature enabled (see the readme of dialog module).

Hmm are you sure that the dialog module is taking care of your second INVITE?

Kind regards
Karsten

Andrew White <andrew at uconnected.com.au<mailto:andrew at uconnected.com.au>> schrieb am Fr., 26. Apr. 2019, 19:15:
Hi all,

I’m still building with app_ruby and loving it - for the most part!

I’m having an issue with one of my providers responding with a 482 on auth invite. Researching, it appears that my CSeq isn’t incrementing and this is the reason for the issue.

I already have the relevant flag set in my kamailio.cfg however:

modparam("dialog", "track_cseq_updates", 1)

During my uac_auth, I’ve tried manually setting the diff, as well as running msg_iflag_reset (as suggested by Daniel - https://github.com/kamailio/kamailio/issues/1359 - unfortunately the function isn’t exported in KEMI):

if KSR::UAC.uac_auth() then
KSR.info("UAC authed, relaying")
#KSR::COREX.msg_iflag_reset("UAC_AUTH")
KSR::PV.sets("$dlg_var(cseq_diff)", "1")
KSR.info("CSeq diff: #{KSR::PV.gete("$dlg_var(cseq_diff)")}")
KSR::TM.t_relay()

Unfortunately in both cases the actual CSeq doesn’t increment in the second INVITE:

INVITE 1 (unauthenticated):
 > CSeq: 102 INVITE

INVITE 2 (with Authorization header):
> CSeq: 102 INVITE

I’m unsure if I’ve missed something silly around the track_cseq_updates flag, or if app_ruby somehow isn’t interacting with the dialog module when running uac_auth to trigger the increment?

Thanks!

Kind regards,

Andrew
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Henning Westerholt - https://skalatan.de/blog/
Kamailio services - https://skalatan.de/services

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Henning Westerholt - https://skalatan.de/blog/
Kamailio services - https://skalatan.de/services
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