diff --git a/chat/session.go b/chat/session.go
index a5efa5c3..05fed674 100644
--- a/chat/session.go
+++ b/chat/session.go
@@ -3,6 +3,7 @@ package chat
 import (
 	"github.com/webitel/call_center/model"
 	"github.com/webitel/engine/chat_manager"
+	enginemodel "github.com/webitel/engine/model"
 	"net/http"
 	"sync"
 )
@@ -96,8 +97,8 @@ func (c *ChatSession) IdleSec() int64 {
 	return (model.GetMillis() - t) / 1000
 }
 
-func (c *ChatSession) Leave() *model.AppError {
-	err := c.cli.Leave(c.UserId, c.SessionId(), c.ConversationId)
+func (c *ChatSession) Leave(cause model.LeaveCause) *model.AppError {
+	err := c.cli.Leave(c.UserId, c.SessionId(), c.ConversationId, enginemodel.LeaveCause(cause))
 	if err != nil {
 		return model.NewAppError("ChatSession", "chat_session.leave.app_err", nil, err.Error(), http.StatusInternalServerError)
 	}
@@ -114,11 +115,11 @@ func (c *ChatSession) Decline() *model.AppError {
 	return nil
 }
 
-func (c *ChatSession) Close() *model.AppError {
+func (c *ChatSession) Close(reason model.LeaveCause) *model.AppError {
 	if c.ChannelId == "" && c.InviteId != "" {
 		return c.Decline()
 	} else {
-		return c.Leave()
+		return c.Leave(reason)
 	}
 }
 
diff --git a/go.mod b/go.mod
index b8cdcf10..9160d3a9 100644
--- a/go.mod
+++ b/go.mod
@@ -14,53 +14,260 @@ require (
 	github.com/pborman/uuid v1.2.1
 	github.com/pkg/errors v0.9.1
 	github.com/streadway/amqp v1.1.0
-	github.com/webitel/engine v0.0.0-20240409111830-4781844bb052
+	github.com/webitel/engine v0.0.0-20240703095009-cdc3ac7a5118
 	github.com/webitel/flow_manager v0.0.0-20240408104238-6ef381ff2d58
 	github.com/webitel/wlog v0.0.0-20220608103744-93b33e61bd28
 	golang.org/x/sync v0.6.0
-	golang.org/x/time v0.1.0
-	google.golang.org/grpc v1.62.0
+	golang.org/x/time v0.5.0
+	google.golang.org/grpc v1.62.2
 )
 
 require (
-	buf.build/gen/go/grpc-ecosystem/grpc-gateway/protocolbuffers/go v1.33.0-20231027202514-3f42134f4c56.1 // indirect
-	buf.build/gen/go/webitel/chat/grpc/go v1.3.0-20240402124150-079f64c1d382.2 // indirect
-	buf.build/gen/go/webitel/chat/protocolbuffers/go v1.33.0-20240402124150-079f64c1d382.1 // indirect
-	buf.build/gen/go/webitel/engine/protocolbuffers/go v1.33.0-20240402125447-cb375844242f.1 // indirect
+	4d63.com/gocheckcompilerdirectives v1.2.1 // indirect
+	4d63.com/gochecknoglobals v0.2.1 // indirect
+	buf.build/gen/go/grpc-ecosystem/grpc-gateway/protocolbuffers/go v1.34.2-20231027202514-3f42134f4c56.2 // indirect
+	buf.build/gen/go/webitel/chat/grpc/go v1.4.0-20240702143950-364c79a4f8d2.2 // indirect
+	buf.build/gen/go/webitel/chat/protocolbuffers/go v1.34.2-20240702143950-364c79a4f8d2.2 // indirect
+	buf.build/gen/go/webitel/engine/grpc/go v1.4.0-20240618123100-3e740393d1cc.1 // indirect
+	buf.build/gen/go/webitel/engine/protocolbuffers/go v1.34.2-20240627112700-3fe53516f45c.2 // indirect
+	buf.build/gen/go/webitel/logger/grpc/go v1.3.0-20240404135439-f6c7830c29dd.2 // indirect
+	buf.build/gen/go/webitel/logger/protocolbuffers/go v1.33.0-20240404135439-f6c7830c29dd.1 // indirect
+	buf.build/gen/go/webitel/webitel-go/grpc/go v1.3.0-20240527133231-c12eb2a85c36.3 // indirect
+	buf.build/gen/go/webitel/webitel-go/protocolbuffers/go v1.34.1-20240527133231-c12eb2a85c36.1 // indirect
 	buf.build/gen/go/webitel/workflow/grpc/go v1.3.0-20240411120545-24ef43af6db3.2 // indirect
+	cloud.google.com/go v0.112.0 // indirect
+	cloud.google.com/go/compute v1.23.3 // indirect
+	cloud.google.com/go/compute/metadata v0.2.3 // indirect
+	cloud.google.com/go/firestore v1.14.0 // indirect
+	cloud.google.com/go/iam v1.1.5 // indirect
+	cloud.google.com/go/longrunning v0.5.4 // indirect
+	cloud.google.com/go/storage v1.36.0 // indirect
+	firebase.google.com/go v3.13.0+incompatible // indirect
+	github.com/Abirdcfly/dupword v0.0.11 // indirect
+	github.com/Antonboom/errname v0.1.9 // indirect
+	github.com/Antonboom/nilnil v0.1.3 // indirect
+	github.com/BoRuDar/configuration/v4 v4.2.2 // indirect
+	github.com/BurntSushi/toml v1.2.1 // indirect
+	github.com/Djarvur/go-err113 v0.0.0-20210108212216-aea10b59be24 // indirect
+	github.com/GaijinEntertainment/go-exhaustruct/v2 v2.3.0 // indirect
+	github.com/Masterminds/semver v1.5.0 // indirect
+	github.com/Masterminds/squirrel v1.5.4 // indirect
+	github.com/OpenPeeDeeP/depguard v1.1.1 // indirect
+	github.com/alexkohler/prealloc v1.0.0 // indirect
+	github.com/alingse/asasalint v0.0.11 // indirect
+	github.com/andres-erbsen/clock v0.0.0-20160526145045-9e14626cd129 // indirect
 	github.com/armon/go-metrics v0.4.1 // indirect
+	github.com/ashanbrown/forbidigo v1.5.1 // indirect
+	github.com/ashanbrown/makezero v1.1.1 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/bkielbasa/cyclop v1.2.0 // indirect
+	github.com/blizzy78/varnamelen v0.8.0 // indirect
+	github.com/bombsimon/wsl/v3 v3.4.0 // indirect
+	github.com/breml/bidichk v0.2.4 // indirect
+	github.com/breml/errchkjson v0.3.1 // indirect
+	github.com/butuzov/ireturn v0.1.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/charithe/durationcheck v0.0.10 // indirect
+	github.com/chavacava/garif v0.0.0-20230227094218-b8c73b2037b8 // indirect
+	github.com/curioswitch/go-reassign v0.2.0 // indirect
+	github.com/daixiang0/gci v0.10.1 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/denis-tingaikin/go-header v0.4.3 // indirect
+	github.com/discoviking/fsm v0.0.0-20150126104936-f4a273feecca // indirect
+	github.com/esimonov/ifshort v1.0.4 // indirect
+	github.com/ettle/strcase v0.1.1 // indirect
 	github.com/fatih/color v1.15.0 // indirect
+	github.com/fatih/structtag v1.2.0 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/firefart/nonamedreturns v1.0.4 // indirect
+	github.com/fsnotify/fsnotify v1.5.4 // indirect
+	github.com/fzipp/gocyclo v0.6.0 // indirect
+	github.com/ghettovoice/gosip v0.0.0-20231005134608-3b981d26e5cc // indirect
+	github.com/go-critic/go-critic v0.7.0 // indirect
+	github.com/go-logr/logr v1.3.0 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-playground/form v3.1.4+incompatible // indirect
+	github.com/go-toolsmith/astcast v1.1.0 // indirect
+	github.com/go-toolsmith/astcopy v1.1.0 // indirect
+	github.com/go-toolsmith/astequal v1.1.0 // indirect
+	github.com/go-toolsmith/astfmt v1.1.0 // indirect
+	github.com/go-toolsmith/astp v1.1.0 // indirect
+	github.com/go-toolsmith/strparse v1.1.0 // indirect
+	github.com/go-toolsmith/typep v1.1.0 // indirect
+	github.com/go-xmlfmt/xmlfmt v1.1.2 // indirect
+	github.com/gobwas/glob v0.2.3 // indirect
+	github.com/gobwas/httphead v0.1.0 // indirect
+	github.com/gobwas/pool v0.2.1 // indirect
+	github.com/gobwas/ws v1.1.0-rc.1 // indirect
+	github.com/gofrs/flock v0.8.1 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/golangci/check v0.0.0-20180506172741-cfe4005ccda2 // indirect
+	github.com/golangci/dupl v0.0.0-20180902072040-3e9179ac440a // indirect
+	github.com/golangci/go-misc v0.0.0-20220329215616-d24fe342adfe // indirect
+	github.com/golangci/gofmt v0.0.0-20220901101216-f2edd75033f2 // indirect
+	github.com/golangci/golangci-lint v1.52.2 // indirect
+	github.com/golangci/lint-1 v0.0.0-20191013205115-297bf364a8e0 // indirect
+	github.com/golangci/maligned v0.0.0-20180506175553-b1d89398deca // indirect
+	github.com/golangci/misspell v0.4.0 // indirect
+	github.com/golangci/revgrep v0.0.0-20220804021717-745bb2f7c2e6 // indirect
+	github.com/golangci/unconvert v0.0.0-20180507085042-28b1c447d1f4 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/google/s2a-go v0.1.7 // indirect
 	github.com/google/uuid v1.6.0 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.2 // indirect
+	github.com/googleapis/gax-go/v2 v2.12.0 // indirect
+	github.com/gordonklaus/ineffassign v0.0.0-20230107090616-13ace0543b28 // indirect
+	github.com/gorilla/handlers v1.5.1 // indirect
+	github.com/gorilla/mux v1.8.0 // indirect
+	github.com/gorilla/websocket v1.5.0 // indirect
+	github.com/gostaticanalysis/analysisutil v0.7.1 // indirect
+	github.com/gostaticanalysis/comment v1.4.2 // indirect
+	github.com/gostaticanalysis/forcetypeassert v0.1.0 // indirect
+	github.com/gostaticanalysis/nilerr v0.1.1 // indirect
 	github.com/hashicorp/consul/api v1.25.1 // indirect
+	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
 	github.com/hashicorp/go-hclog v1.5.0 // indirect
 	github.com/hashicorp/go-immutable-radix v1.3.1 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/hashicorp/go-rootcerts v1.0.2 // indirect
+	github.com/hashicorp/go-version v1.6.0 // indirect
 	github.com/hashicorp/golang-lru v1.0.2 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/hashicorp/serf v0.10.1 // indirect
+	github.com/hexops/gotextdiff v1.0.3 // indirect
+	github.com/inconshreveable/mousetrap v1.0.1 // indirect
+	github.com/jgautheron/goconst v1.5.1 // indirect
+	github.com/jingyugao/rowserrcheck v1.1.1 // indirect
+	github.com/jirfag/go-printf-func-name v0.0.0-20200119135958-7558a9eaa5af // indirect
+	github.com/jmoiron/sqlx v1.3.5 // indirect
+	github.com/jpillora/backoff v1.0.0 // indirect
+	github.com/julz/importas v0.1.0 // indirect
+	github.com/junk1tm/musttag v0.5.0 // indirect
+	github.com/kisielk/errcheck v1.6.3 // indirect
+	github.com/kisielk/gotool v1.0.0 // indirect
+	github.com/kkHAIKE/contextcheck v1.1.4 // indirect
 	github.com/kr/pretty v0.3.1 // indirect
+	github.com/kulti/thelper v0.6.3 // indirect
+	github.com/kunwardeep/paralleltest v1.0.6 // indirect
+	github.com/kyoh86/exportloopref v0.1.11 // indirect
+	github.com/lann/builder v0.0.0-20180802200727-47ae307949d0 // indirect
+	github.com/lann/ps v0.0.0-20150810152359-62de8c46ede0 // indirect
+	github.com/ldez/gomoddirectives v0.2.3 // indirect
+	github.com/ldez/tagliatelle v0.4.0 // indirect
+	github.com/leonklingele/grouper v1.1.1 // indirect
+	github.com/lufeee/execinquery v1.2.1 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/maratori/testableexamples v1.0.0 // indirect
+	github.com/maratori/testpackage v1.1.1 // indirect
+	github.com/matoous/godox v0.0.0-20230222163458-006bad1f9d26 // indirect
+	github.com/matryer/moq v0.3.1 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.19 // indirect
+	github.com/mattn/go-runewidth v0.0.9 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
+	github.com/mbilski/exhaustivestruct v1.2.0 // indirect
+	github.com/mbobakov/grpc-consul-resolver v1.5.2 // indirect
+	github.com/mgechev/revive v1.3.1 // indirect
+	github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/moricho/tparallel v0.3.1 // indirect
+	github.com/nakabonne/nestif v0.3.1 // indirect
+	github.com/nbutton23/zxcvbn-go v0.0.0-20210217022336-fa2cb2858354 // indirect
 	github.com/nicksnyder/go-i18n v1.10.1 // indirect
+	github.com/nishanths/exhaustive v0.9.5 // indirect
+	github.com/nishanths/predeclared v0.2.2 // indirect
+	github.com/nunnatsa/ginkgolinter v0.9.0 // indirect
+	github.com/olekukonko/tablewriter v0.0.5 // indirect
 	github.com/pelletier/go-toml v1.9.5 // indirect
+	github.com/pelletier/go-toml/v2 v2.0.5 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/polyfloyd/go-errorlint v1.4.0 // indirect
+	github.com/prometheus/client_golang v1.12.1 // indirect
+	github.com/prometheus/client_model v0.4.0 // indirect
+	github.com/prometheus/common v0.32.1 // indirect
+	github.com/prometheus/procfs v0.7.3 // indirect
+	github.com/quasilyte/go-ruleguard v0.3.19 // indirect
+	github.com/quasilyte/gogrep v0.5.0 // indirect
+	github.com/quasilyte/regex/syntax v0.0.0-20210819130434-b3f0c404a727 // indirect
+	github.com/quasilyte/stdinfo v0.0.0-20220114132959-f7386bf02567 // indirect
 	github.com/rogpeppe/go-internal v1.11.0 // indirect
+	github.com/ryancurrah/gomodguard v1.3.0 // indirect
+	github.com/ryanrolds/sqlclosecheck v0.4.0 // indirect
+	github.com/sanposhiho/wastedassign/v2 v2.0.7 // indirect
+	github.com/sashamelentyev/interfacebloat v1.1.0 // indirect
+	github.com/sashamelentyev/usestdlibvars v1.23.0 // indirect
+	github.com/satori/go.uuid v1.2.1-0.20181028125025-b2ce2384e17b // indirect
+	github.com/securego/gosec/v2 v2.15.0 // indirect
+	github.com/shazow/go-diff v0.0.0-20160112020656-b6b7b6733b8c // indirect
+	github.com/sirupsen/logrus v1.9.0 // indirect
+	github.com/sivchari/containedctx v1.0.2 // indirect
+	github.com/sivchari/nosnakecase v1.7.0 // indirect
+	github.com/sivchari/tenv v1.7.1 // indirect
+	github.com/sonatard/noctx v0.0.2 // indirect
+	github.com/sourcegraph/go-diff v0.7.0 // indirect
+	github.com/spf13/afero v1.9.2 // indirect
+	github.com/spf13/cast v1.5.0 // indirect
+	github.com/spf13/cobra v1.6.1 // indirect
+	github.com/spf13/jwalterweatherman v1.1.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/spf13/viper v1.12.0 // indirect
+	github.com/ssgreg/nlreturn/v2 v2.2.1 // indirect
+	github.com/stbenjam/no-sprintf-host-port v0.1.1 // indirect
+	github.com/stretchr/objx v0.5.0 // indirect
+	github.com/stretchr/testify v1.8.4 // indirect
+	github.com/subosito/gotenv v1.4.1 // indirect
+	github.com/t-yuki/gocover-cobertura v0.0.0-20180217150009-aaee18c8195c // indirect
+	github.com/tdakkota/asciicheck v0.2.0 // indirect
+	github.com/tetafro/godot v1.4.11 // indirect
+	github.com/tevino/abool v1.2.0 // indirect
+	github.com/timakin/bodyclose v0.0.0-20221125081123-e39cf3fc478e // indirect
+	github.com/timonwong/loggercheck v0.9.4 // indirect
+	github.com/tomarrell/wrapcheck/v2 v2.8.1 // indirect
+	github.com/tommy-muehle/go-mnd/v2 v2.5.1 // indirect
+	github.com/ultraware/funlen v0.0.3 // indirect
+	github.com/ultraware/whitespace v0.0.5 // indirect
+	github.com/uudashr/gocognit v1.0.6 // indirect
+	github.com/x-cray/logrus-prefixed-formatter v0.5.2 // indirect
+	github.com/yagipy/maintidx v1.0.0 // indirect
+	github.com/yeya24/promlinter v0.2.0 // indirect
+	gitlab.com/bosi/decorder v0.2.3 // indirect
+	go.opencensus.io v0.24.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.46.1 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.46.1 // indirect
+	go.opentelemetry.io/otel v1.21.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
+	go.opentelemetry.io/otel/trace v1.21.0 // indirect
 	go.uber.org/atomic v1.11.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
+	go.uber.org/ratelimit v0.2.0 // indirect
 	go.uber.org/zap v1.26.0 // indirect
+	golang.org/x/crypto v0.18.0 // indirect
 	golang.org/x/exp v0.0.0-20231006140011-7918f672742d // indirect
+	golang.org/x/exp/typeparams v0.0.0-20230224173230-c95f2b4c22f2 // indirect
+	golang.org/x/mod v0.13.0 // indirect
 	golang.org/x/net v0.20.0 // indirect
 	golang.org/x/oauth2 v0.16.0 // indirect
 	golang.org/x/sys v0.16.0 // indirect
+	golang.org/x/term v0.16.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
+	golang.org/x/tools v0.14.0 // indirect
+	google.golang.org/api v0.155.0 // indirect
 	google.golang.org/appengine v1.6.8 // indirect
 	google.golang.org/genproto v0.0.0-20240123012728-ef4313101c80 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20240123012728-ef4313101c80 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20240123012728-ef4313101c80 // indirect
-	google.golang.org/protobuf v1.33.0 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
 	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/natefinch/lumberjack.v2 v2.2.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	honnef.co/go/tools v0.4.3 // indirect
+	mvdan.cc/gofumpt v0.4.0 // indirect
+	mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed // indirect
+	mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b // indirect
+	mvdan.cc/unparam v0.0.0-20221223090309-7455f1af531d // indirect
 )
diff --git a/model/queue.go b/model/queue.go
index 4847b5a2..cd970350 100644
--- a/model/queue.go
+++ b/model/queue.go
@@ -46,6 +46,14 @@ const (
 	QUEUE_ATTEMPT_SEQ       = "cc_attempt_seq"
 )
 
+const (
+	AgentTimeout   LeaveCause = "agent_timeout"
+	ClientTimeout             = "client_timeout"
+	SilenceTimeout            = "silence_timeout"
+)
+
+type LeaveCause string
+
 const (
 	QueueAutoAnswerVariable = "wbt_auto_answer"
 )
diff --git a/queue/chat_inbound.go b/queue/chat_inbound.go
index 2a67ceb7..5ee663f3 100644
--- a/queue/chat_inbound.go
+++ b/queue/chat_inbound.go
@@ -198,7 +198,7 @@ func (queue *InboundChatQueue) process(attempt *Attempt, inviterId, invUserId st
 						if queue.settings.MaxIdleAgent > 0 && timeoutStrategy {
 							attempt.Log("max idle agent")
 							attempt.SetResult(AttemptResultAgentTimeout)
-							aSess.Leave()
+							aSess.Leave(model.AgentTimeout)
 							break
 						}
 
@@ -211,14 +211,14 @@ func (queue *InboundChatQueue) process(attempt *Attempt, inviterId, invUserId st
 						if queue.settings.MaxIdleClient > 0 && timeoutStrategy {
 							attempt.Log("max idle client")
 							attempt.SetResult(AttemptResultClientTimeout)
-							aSess.Leave()
+							aSess.Leave(model.ClientTimeout)
 							break
 						}
 
 						if queue.settings.MaxIdleDialog > 0 && aSess != nil && conv.SilentSec() >= queue.settings.MaxIdleDialog {
 							attempt.Log("max idle dialog")
 							attempt.SetResult(AttemptResultDialogTimeout)
-							aSess.Leave()
+							aSess.Leave("todo silence timeout")
 							break
 						}
 
@@ -277,7 +277,8 @@ func (queue *InboundChatQueue) process(attempt *Attempt, inviterId, invUserId st
 
 	if agent != nil && team != nil {
 		if aSess != nil && aSess.StopAt() == 0 {
-			aSess.Close()
+			// TODO: what reason is this?
+			aSess.Close("")
 		}
 		transferredProcessing := conv.Cause() == "transfer" &&
 			queue.GetVariable(transferResult) == model.MEMBER_CAUSE_ABANDONED