diff --git a/docs/swagger.yaml b/docs/swagger.yaml
index b6dc4bc..7df916f 100644
--- a/docs/swagger.yaml
+++ b/docs/swagger.yaml
@@ -33,8 +33,6 @@ definitions:
         type: integer
       password:
         type: string
-      realm:
-        type: string
       transport:
         type: string
     type: object
@@ -83,6 +81,25 @@ definitions:
       total:
         type: integer
     type: object
+  handler.updateEndpointRequest:
+    properties:
+      codecs:
+        items:
+          type: string
+        type: array
+      context:
+        type: string
+      displayName:
+        type: string
+      extension:
+        type: string
+      maxContacts:
+        type: integer
+      password:
+        type: string
+      transport:
+        type: string
+    type: object
 host: localhost:8080
 info:
   contact: {}
@@ -204,4 +221,25 @@ paths:
       summary: Get information from a specific endpoint.
       tags:
       - endpoints
+    patch:
+      parameters:
+      - description: Sid of the endpoint to be updated
+        in: path
+        name: sid
+        required: true
+        type: integer
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/handler.updateEndpointRequest'
+        "400":
+          description: Bad Request
+        "404":
+          description: Not Found
+        "500":
+          description: Internal Server Error
+      summary: Update the specified endpoint. Omitted or null fields will remain unchanged.
+      tags:
+      - endpoints
 swagger: "2.0"
diff --git a/internal/handler/endpoint.go b/internal/handler/endpoint.go
index 3e286f6..44b7089 100644
--- a/internal/handler/endpoint.go
+++ b/internal/handler/endpoint.go
@@ -17,6 +17,8 @@ import (
 	"strings"
 )
 
+const defaultRealm = "asterisk"
+
 type Endpoint struct {
 	*pgx.Conn
 }
@@ -24,7 +26,6 @@ type Endpoint struct {
 type createEndpointRequest struct {
 	ID          string   `json:"id"`
 	Password    string   `json:"password"`
-	Realm       string   `json:"realm,omitempty"`
 	Transport   string   `json:"transport,omitempty"`
 	Context     string   `json:"context"`
 	Codecs      []string `json:"codecs"`
@@ -58,12 +59,23 @@ type getEndpointResponse struct {
 	Extension   string   `json:"extension"`
 }
 
+type updateEndpointRequest struct {
+	Password    *string  `json:"password,omitempty"`
+	DisplayName *string  `json:"displayName,omitempty"`
+	Transport   *string  `json:"transport,omitempty"`
+	Context     *string  `json:"context,omitempty"`
+	Codecs      []string `json:"codecs,omitempty"`
+	MaxContacts *int32   `json:"maxContacts,omitempty"`
+	Extension   *string  `json:"extension,omitempty"`
+}
+
 func (e *Endpoint) Router() chi.Router {
 	r := chi.NewRouter()
 	r.Post("/", e.create)
 	r.Get("/", e.list)
 	r.Get("/{sid}", e.get)
 	r.Delete("/{sid}", e.delete)
+	r.Patch("/{sid}", e.update)
 
 	return r
 }
@@ -89,6 +101,11 @@ func displayNameFromClid(callerID string) string {
 	return callerID[1:end]
 }
 
+func hashPassword(user, password, realm string) string {
+	hash := md5.Sum([]byte(user + ":" + realm + ":" + password))
+	return hex.EncodeToString(hash[:])
+}
+
 // @Summary Get information from a specific endpoint.
 // @Param sid path int true "Requested endpoint's sid"
 // @Produce json
@@ -235,7 +252,6 @@ func (e *Endpoint) list(w http.ResponseWriter, r *http.Request) {
 func (e *Endpoint) create(w http.ResponseWriter, r *http.Request) {
 	decoder := json.NewDecoder(r.Body)
 	payload := createEndpointRequest{
-		Realm:       "asterisk",
 		MaxContacts: 1,
 	}
 
@@ -254,12 +270,11 @@ func (e *Endpoint) create(w http.ResponseWriter, r *http.Request) {
 
 	queries := sqlc.New(tx)
 
-	hash := md5.Sum([]byte(payload.ID + ":" + payload.Realm + ":" + payload.Password))
 	err = queries.NewMD5Auth(r.Context(), sqlc.NewMD5AuthParams{
 		ID:       payload.ID,
 		Username: db.Text(payload.ID),
-		Realm:    db.Text(payload.Realm),
-		Md5Cred:  db.Text(hex.EncodeToString(hash[:])),
+		Realm:    db.Text(defaultRealm),
+		Md5Cred:  db.Text(hashPassword(payload.ID, payload.Password, defaultRealm)),
 	})
 	if err != nil {
 		w.WriteHeader(http.StatusInternalServerError)
@@ -397,3 +412,179 @@ func (e *Endpoint) delete(w http.ResponseWriter, r *http.Request) {
 
 	w.WriteHeader(http.StatusNoContent)
 }
+
+// @Summary Update the specified endpoint. Omitted or null fields will remain unchanged.
+// @Param sid path int true "Sid of the endpoint to be updated"
+// @Success 200 {object} updateEndpointRequest
+// @Failure 400
+// @Failure 404
+// @Failure 500
+// @Tags endpoints
+// @Router /endpoints/{sid} [patch]
+func (e *Endpoint) update(w http.ResponseWriter, r *http.Request) {
+	decoder := json.NewDecoder(r.Body)
+	var payload updateEndpointRequest
+
+	err := decoder.Decode(&payload)
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	urlSid := chi.URLParam(r, "sid")
+	sid, err := strconv.Atoi(urlSid)
+	if err != nil || sid <= 0 {
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	tx, err := e.Begin(r.Context())
+	if err != nil {
+		slog.Error("Failed to start transaction", slog.String("reason", err.Error()), slog.String("path", r.URL.Path))
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+
+	queries := sqlc.New(tx)
+	endpoint, err := queries.GetEndpointByID(r.Context(), int32(sid))
+	if errors.Is(err, pgx.ErrNoRows) {
+		w.WriteHeader(http.StatusNotFound)
+		return
+	} else if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		slog.Error("Failed to retrieve endpoint", slog.String("path", r.URL.Path), slog.String("reason", err.Error()))
+		return
+	}
+
+	// Sorry for the incoming boilerplate but no dynamic SQL yet
+	var patchedEndpoint = sqlc.UpdateEndpointBySidParams{Sid: int32(sid)}
+	if payload.DisplayName != nil {
+		if *payload.DisplayName == "" {
+			patchedEndpoint.Callerid = db.Text("")
+		} else {
+			patchedEndpoint.Callerid = db.Text(fmt.Sprintf(`"%s" <%s>`, *payload.DisplayName, endpoint.ID))
+		}
+	} else {
+		patchedEndpoint.Callerid = endpoint.Callerid
+	}
+	if payload.Context != nil {
+		patchedEndpoint.Context = db.Text(*payload.Context)
+	} else {
+		patchedEndpoint.Context = endpoint.Context
+	}
+	if payload.Transport != nil {
+		patchedEndpoint.Transport = db.Text(*payload.Transport)
+	} else {
+		patchedEndpoint.Transport = endpoint.Transport
+	}
+	if payload.Codecs != nil {
+		patchedEndpoint.Allow = db.Text(strings.Join(payload.Codecs, ","))
+	} else {
+		patchedEndpoint.Allow = endpoint.Allow
+	}
+	err = queries.UpdateEndpointBySid(r.Context(), patchedEndpoint)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		slog.Error("Failed to update endpoint", slog.String("path", r.URL.Path), slog.String("reason", err.Error()))
+		return
+	}
+
+	if payload.MaxContacts != nil {
+		err = queries.UpdateAORById(
+			r.Context(),
+			sqlc.UpdateAORByIdParams{
+				ID:          endpoint.ID,
+				MaxContacts: db.Int4(*payload.MaxContacts),
+			},
+		)
+	}
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		slog.Error("Failed to update AOR", slog.String("path", r.URL.Path), slog.String("reason", err.Error()))
+		return
+	}
+
+	if payload.Extension != nil {
+		err = queries.UpdateExtensionByEndpointId(
+			r.Context(),
+			sqlc.UpdateExtensionByEndpointIdParams{
+				EndpointID: int32(sid),
+				Extension:  db.Text(*payload.Extension),
+			},
+		)
+	}
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		slog.Error("Failed to update extension", slog.String("path", r.URL.Path), slog.String("reason", err.Error()))
+		return
+	}
+
+	if payload.Password != nil {
+		if len(*payload.Password) < 12 {
+			w.WriteHeader(http.StatusBadRequest)
+			slog.Info("Invalid password provided", slog.String("path", r.URL.Path))
+			return
+		}
+		err = queries.UpdateMD5AuthById(
+			r.Context(),
+			sqlc.UpdateMD5AuthByIdParams{
+				ID:      endpoint.ID,
+				Md5Cred: db.Text(hashPassword(endpoint.ID, *payload.Password, defaultRealm)),
+			},
+		)
+	}
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		slog.Error("Failed to update password", slog.String("path", r.URL.Path), slog.String("reason", err.Error()))
+		return
+	}
+
+	err = tx.Commit(r.Context())
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		slog.Error("Failed to commit update", slog.String("path", r.URL.Path), slog.String("reason", err.Error()))
+		return
+	}
+
+	// TODO: Duplicate code, same as when fetching endpoint. Probably should put this into a service layer.
+	tx, err = e.Begin(r.Context())
+	queries = sqlc.New(tx)
+	if err != nil {
+		slog.Error("Failed to create new transaction", slog.String("path", r.URL.Path), slog.String("reason", err.Error()))
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+	res, err := queries.GetEndpointByID(r.Context(), int32(sid))
+	if err != nil {
+		slog.Error(
+			"Failed to retrieve created endpoint",
+			slog.String("path", r.URL.Path), slog.String("reason", err.Error()), slog.Int("sid", int(sid)),
+		)
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+
+	result := getEndpointResponse{
+		Sid:         int32(sid),
+		ID:          res.ID,
+		Transport:   res.Transport.String,
+		Context:     res.Context.String,
+		Codecs:      strings.Split(res.Allow.String, ","),
+		MaxContacts: res.MaxContacts.Int32,
+		Extension:   res.Extension.String,
+		DisplayName: displayNameFromClid(res.Callerid.String),
+	}
+	content, err := json.Marshal(result)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		slog.Error("Failed to marshall response", slog.String("path", r.URL.Path))
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	_, err = w.Write(content)
+	if err != nil {
+		slog.Error("Failed to write response", slog.String("path", r.URL.Path), slog.String("reason", err.Error()))
+	}
+	w.WriteHeader(http.StatusOK)
+}
diff --git a/internal/sqlc/queries.sql.go b/internal/sqlc/queries.sql.go
index d5ccc69..b0750f5 100644
--- a/internal/sqlc/queries.sql.go
+++ b/internal/sqlc/queries.sql.go
@@ -255,3 +255,91 @@ func (q *Queries) NewMD5Auth(ctx context.Context, arg NewMD5AuthParams) error {
 	)
 	return err
 }
+
+const updateAORById = `-- name: UpdateAORById :exec
+UPDATE
+    ps_aors
+SET
+    max_contacts = $1
+WHERE
+    id = $2
+`
+
+type UpdateAORByIdParams struct {
+	MaxContacts pgtype.Int4 `json:"max_contacts"`
+	ID          string      `json:"id"`
+}
+
+func (q *Queries) UpdateAORById(ctx context.Context, arg UpdateAORByIdParams) error {
+	_, err := q.db.Exec(ctx, updateAORById, arg.MaxContacts, arg.ID)
+	return err
+}
+
+const updateEndpointBySid = `-- name: UpdateEndpointBySid :exec
+UPDATE
+    ps_endpoints
+SET
+    callerid = $1,
+    context = $2,
+    transport = $3,
+    allow = $4
+WHERE
+    sid = $5
+`
+
+type UpdateEndpointBySidParams struct {
+	Callerid  pgtype.Text `json:"callerid"`
+	Context   pgtype.Text `json:"context"`
+	Transport pgtype.Text `json:"transport"`
+	Allow     pgtype.Text `json:"allow"`
+	Sid       int32       `json:"sid"`
+}
+
+func (q *Queries) UpdateEndpointBySid(ctx context.Context, arg UpdateEndpointBySidParams) error {
+	_, err := q.db.Exec(ctx, updateEndpointBySid,
+		arg.Callerid,
+		arg.Context,
+		arg.Transport,
+		arg.Allow,
+		arg.Sid,
+	)
+	return err
+}
+
+const updateExtensionByEndpointId = `-- name: UpdateExtensionByEndpointId :exec
+UPDATE
+    ery_extension
+SET
+    extension = $1
+WHERE
+    endpoint_id = $2
+`
+
+type UpdateExtensionByEndpointIdParams struct {
+	Extension  pgtype.Text `json:"extension"`
+	EndpointID int32       `json:"endpoint_id"`
+}
+
+func (q *Queries) UpdateExtensionByEndpointId(ctx context.Context, arg UpdateExtensionByEndpointIdParams) error {
+	_, err := q.db.Exec(ctx, updateExtensionByEndpointId, arg.Extension, arg.EndpointID)
+	return err
+}
+
+const updateMD5AuthById = `-- name: UpdateMD5AuthById :exec
+UPDATE
+    ps_auths
+SET
+    md5_cred = $1
+WHERE
+    id = $2
+`
+
+type UpdateMD5AuthByIdParams struct {
+	Md5Cred pgtype.Text `json:"md5_cred"`
+	ID      string      `json:"id"`
+}
+
+func (q *Queries) UpdateMD5AuthById(ctx context.Context, arg UpdateMD5AuthByIdParams) error {
+	_, err := q.db.Exec(ctx, updateMD5AuthById, arg.Md5Cred, arg.ID)
+	return err
+}
diff --git a/queries.sql b/queries.sql
index 6f48293..b76dbc6 100644
--- a/queries.sql
+++ b/queries.sql
@@ -68,3 +68,39 @@ WHERE
 
 -- name: CountEndpoints :one
 SELECT COUNT(*) FROM ps_endpoints;
+
+-- name: UpdateEndpointBySid :exec
+UPDATE
+    ps_endpoints
+SET
+    callerid = $1,
+    context = $2,
+    transport = $3,
+    allow = $4
+WHERE
+    sid = $5;
+
+-- name: UpdateExtensionByEndpointId :exec
+UPDATE
+    ery_extension
+SET
+    extension = $1
+WHERE
+    endpoint_id = $2;
+
+-- name: UpdateAORById :exec
+UPDATE
+    ps_aors
+SET
+    max_contacts = $1
+WHERE
+    id = $2;
+
+-- name: UpdateMD5AuthById :exec
+UPDATE
+    ps_auths
+SET
+    md5_cred = $1
+WHERE
+    id = $2;
+