Hi there,

I've two kamailio servers sharing dlg vars between them and I've noticed that during high call load (~50-70 CPS) the kamailio that is processing all the calls and sharing the dialogs with the other kamailio, stops processing SIP.

If I set the parameter enable_dmq to 0 I cannot replicate the issue so I assume that it's related to dialog replication through DMQ.

Kamailio version: 5.4.7 - I've tested with recent versions but the issue remains

Configurations of Kamailio_1:

# ----- dialog params -----
modparam("dialog", "dlg_flag", FLD_DLG)
modparam("dialog", "dlg_match_mode", 1)
modparam("dialog", "enable_dmq", 1)
modparam("dialog", "h_id_start", 1000)
modparam("dialog", "h_id_step", 6000)

# ----- dmq params -----
modparam("dmq", "server_address", "sip:INTERNAL_INSTANCE_IP:5060")
modparam("dmq", "notification_address", "DMQ_NOTIFICATION_ADDRESS")

modparam("dmq", "multi_notify", 1)
modparam("dmq", "ping_interval", 10)
modparam("dmq", "num_workers",4)

Configurations of Kamailio_2:

# ----- dialog params -----
modparam("dialog", "dlg_flag", FLD_DLG)
modparam("dialog", "dlg_match_mode", 1)
modparam("dialog", "enable_dmq", 1)
modparam("dialog", "h_id_start", 5000)
modparam("dialog", "h_id_step", 6000)

# ----- dmq params -----
modparam("dmq", "server_address", "sip:INTERNAL_INSTANCE_IP:5060")
modparam("dmq", "notification_address", "DMQ_NOTIFICATION_ADDRESS")

modparam("dmq", "multi_notify", 1)
modparam("dmq", "ping_interval", 10)
modparam("dmq", "num_workers",4)

In this link you can find the kamctl trap output after kamailio stop processing SIP.

Thank you

Best Regards

Cumprimentos

José Seabra