Examples (v4) POST /api/v4/transactions/messages { "session_id": "kgdq3n@127.0.0.1_b2b-1", "proto_type": 1, "event_type": "call" } POST /api/v4/transactions/qos { "session_id": "kgdq3n@127.0.0.1_b2b-1" }