When you call, we use dlg_manage (); function to authorize the ISP with the following settings dialog module
loadmodule "dialog.so"
modparam ( "dialog", "enable_stats", 0)
modparam ( "dialog", "db_url", DBURL)
modparam ( "dialog", "db_mode", 1)
modparam ( "dialog", "table_name", "dialog")
modparam ( "dialog", "dlg_match_mode", 1)
modparam ( "dialog", "dlg_flag", 4)
modparam ( "dialog", "track_cseq_updates", 1)
When sending a request ISP CANCEL get answers to 200 and 487, but instead of ACK otpralyaem COI new CANCEL.

10.1.244.235:5060 176.99.138.244:5060│
──────────┬───────── ──────────┬─────────
│ │
│ │
│ │
│ │
│ INVITE (SDP) │
│ ──────────────────────────> │
│ 401 Unauthorized │
│ <────────────────────────── │
│ ACK │
│ ──────────────────────────> │
│ INVITE (SDP) │
│ ──────────────────────────> │
│ 100 Trying │
│ <────────────────────────── │
│ 180 Ringing │
│ <────────────────────────── │
│ CANCEL │
│ ──────────────────────────> │
│ 487 Request Terminated │
│ <────────────────────────── │
│ 200 OK │
│ <────────────────────────── │
│ CANCEL │
│ ──────────────────────────> │
│ 500 Server error │
│ <────────────────────────── │
│ 487 Request Terminated │
│ <────────────────────────── │
│ 487 Request Terminated │
│ <<<──────────────────────── │
│ 487 Request Terminated │
│ <<<──────────────────────── │
how to remove the second CANCEL?

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