[OpenSIPS-Users] dlg_validate_dialog errors in loose_route

Jeff Pyle jpyle at fidelityvoice.com
Sun Apr 10 03:17:02 CEST 2011

Scratch the "only on BYE and ACK" theory.  I extended the if-statement to not fire on ACKs and BYEs, and I saw an error on an INVITE.

I see the documentation for the $DLG_status<http://www.opensips.org/html/docs/modules/1.6.x/dialog.html#id285525> variable and the validate_dialog()<http://www.opensips.org/html/docs/modules/1.6.x/dialog.html#id284396> function.  The $DLG_status variable as used in the loose_route if-statement seems to confirm the existence of the dialog in Opensips.  By what mechanism does it determine the existence of the dialog?  The validate_dialog() doc says, "The performed tests are related to CSEQ sequence checking and routing information checking (contact and route set)."  What are the specific conditions?

- Jeff

From: Jeff Pyle <jpyle at fidelityvoice.com<mailto:jpyle at fidelityvoice.com>>
Reply-To: OpenSIPS users mailling list <users at lists.opensips.org<mailto:users at lists.opensips.org>>
Date: Sat, 9 Apr 2011 15:32:50 -0400
To: OpenSIPS users mailling list <users at lists.opensips.org<mailto:users at lists.opensips.org>>
Subject: [OpenSIPS-Users] dlg_validate_dialog errors on BYE and ACK in loose_route


I'm trying a new chunklet of config in loose_route().  I believe this came from a documentation page somewhere, so I don't pretend to take credit for the concept.

                        # Clean up dialog data if necessary
                        if ($DLG_status!=NULL && !validate_dialog()) {
                                xlog("L_INFO", "Unable to validate dialog, fixing - $hdr(CSeq) on $ci\n");

I send the first batch of pseudo-production traffic through this config today and I ended up with a metric ton of:
  ERROR:dialog:dlg_validate_dialog: Check failed for route number 0. req=[sip:<opensips-IP?;lr;ftag=23ddd50-0-13c4-1f179b-78884527-1f179b;did=45b.b972314],dlg=[sip:<opensips-IP>;lr=on;ftag=23ddd50-0-13c4-1f179b-78884527-1f179b;did=45b.b972314]

And, the xlogs from the above line:
  Unable to validate dialog, fixing - 3 BYE on <callid>

It showed up on a number of BYEs and ACKs.  My dialog module config is as follows:

# ----- dialog params -----
modparam("dialog", "dlg_flag", 4)
modparam("dialog", "bye_on_timeout_flag", 4)
modparam("dialog", "default_timeout", 21600)
modparam("dialog|sst", "timeout_avp", "$avp(s:dialog_timeout)")
modparam("dialog", "dlg_extra_hdrs", "Hint: dialog expired\r\n")
modparam("dialog", "dlg_match_mode", 1)  # 0 = DID_ONLY; 1 = DID first, SIP second; 2 = SIP only
modparam("dialog", "db_url", "mysql://osuer:ospass@dbcluster/osdb")
modparam("dialog", "table_name", "dialog_1")
modparam("dialog", "db_mode", 1)  # 1 = Realtime to DB; 2 = delayed; 3 = on shutdown
modparam("dialog", "profiles_with_value", "711calls; 729calls; calls")

create_dialog() runs on all initial INVITEs.

Is this type of behavior anything close to normal?  What might cause it?  My immediate fix is to simply comment out this portion of the config, but I'm afraid I might be masking a larger issue.  Any suggestions would be great.

Just had a thought as I was about to send this email.  Perhaps this is because by the time the BYE gets to this portion of the script, the dialog is already torn down?  Could it be that simple, just add "if !(is_method("BYE") || is_method("ACK"))" to the top line of this config portion?

- Jeff

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