diff --git a/lib/common/expression-parser.ts b/lib/common/expression-parser.ts
index 07833f1..ead985e 100644
--- a/lib/common/expression-parser.ts
+++ b/lib/common/expression-parser.ts
@@ -215,9 +215,7 @@ const lang = parsimmon.createLanguage({
         .regexp(/([a-zA-Z0-9_]+)/, 1)
         .skip(parsimmon.optWhitespace)
         .desc("function"),
-      r.Expression.sepBy(
-        parsimmon.string(",").skip(parsimmon.optWhitespace)
-      ).wrap(
+      r.ExpressionList.wrap(
         parsimmon.string("(").skip(parsimmon.optWhitespace),
         parsimmon.string(")").skip(parsimmon.optWhitespace)
       ),
@@ -330,6 +328,11 @@ const lang = parsimmon.createLanguage({
       )
     );
   },
+  ExpressionList: function (r) {
+    return r.Expression.sepBy(
+      parsimmon.string(",").skip(parsimmon.optWhitespace)
+    );
+  },
   Expression: function (r) {
     function unary(operatorsParser, nextParser): parsimmon.Parser<unknown> {
       return parsimmon.seq(operatorsParser, nextParser).or(nextParser);
@@ -350,6 +353,11 @@ export function parse(str: string): Expression {
   return lang.Expression.tryParse(str);
 }
 
+export function parseList(str: string): Expression[] {
+  if (!str) return [];
+  return lang.ExpressionList.tryParse(str);
+}
+
 export function stringify(exp: Expression, level = 0): string {
   if (!Array.isArray(exp)) return JSON.stringify(exp);
 
diff --git a/lib/common/expression.ts b/lib/common/expression.ts
index 7b84bf8..593c1d6 100644
--- a/lib/common/expression.ts
+++ b/lib/common/expression.ts
@@ -112,17 +112,25 @@ export function evaluateCallback(exp: Expression): Expression {
       if (exp[i]) return exp[i + 1];
     }
     return null;
-  } else if (exp[0] === "FUNC" && exp[1] === "COALESCE") {
-    const args: Expression[] = [];
-    for (let i = 2; i < exp.length; ++i) {
-      const e = exp[i];
-      if (e == null) continue;
-      args.push(e);
-      if (!Array.isArray(e)) break;
+  } else if (exp[0] === "FUNC") {
+    if (exp[1] === "COALESCE") {
+      const args: Expression[] = [];
+      for (let i = 2; i < exp.length; ++i) {
+        const e = exp[i];
+        if (e == null) continue;
+        args.push(e);
+        if (!Array.isArray(e)) break;
+      }
+      if (!args.length) return null;
+      if (args.length === 1) return args[0];
+      return ["FUNC", "COALESCE", ...args];
+    } else if (exp[1] === "UPPER") {
+      if (exp[2] == null) return null;
+      if (!isArray(exp[2])) return toString(exp[2]).toUpperCase();
+    } else if (exp[1] === "LOWER") {
+      if (exp[2] == null) return null;
+      if (!isArray(exp[2])) return toString(exp[2]).toLowerCase();
     }
-    if (!args.length) return null;
-    if (args.length === 1) return args[0];
-    return ["FUNC", "COALESCE", ...args];
   } else if (exp[0] === "AND") {
     for (let i = 1; i < exp.length; ++i)
       if (!Array.isArray(exp[i]) && exp[i] != null && !exp[i]) return false;
@@ -274,16 +282,8 @@ export function evaluate(
     if (cb) e = cb(e);
     if (!isArray(e)) return e;
 
-    if (e[0] === "FUNC") {
-      if (e[1] === "NOW") {
-        if (now) return now;
-      } else if (e[1] === "UPPER") {
-        if (e[2] == null) return null;
-        if (!isArray(e[2])) return `${e[2]}`.toUpperCase();
-      } else if (e[1] === "LOWER") {
-        if (e[2] == null) return null;
-        if (!isArray(e[2])) return `${e[2]}`.toLowerCase();
-      }
+    if (e[0] === "FUNC" && e[1] === "NOW") {
+      if (now) return now;
     } else if (e[0] === "PARAM") {
       if (e[1] == null) return null;
       if (obj && !isArray(e[1])) {
diff --git a/lib/cwmp.ts b/lib/cwmp.ts
index 0cb189a..a17dbdb 100644
--- a/lib/cwmp.ts
+++ b/lib/cwmp.ts
@@ -45,6 +45,7 @@ import {
   SoapMessage,
   InformRequest,
   AcsResponse,
+  Preset,
 } from "./types";
 import { IncomingMessage, ServerResponse } from "http";
 import { Readable } from "stream";
@@ -431,7 +432,7 @@ async function applyPresets(sessionContext: SessionContext): Promise<void> {
   }
 
   const parameters: { [name: string]: Path } = {};
-  const filteredPresets = [];
+  const filteredPresets: Preset[] = [];
 
   for (const preset of presets) {
     if (whiteList != null) {
@@ -460,11 +461,24 @@ async function applyPresets(sessionContext: SessionContext): Promise<void> {
     }
 
     filteredPresets.push(preset);
-    for (const k of extractParams(preset.precondition)) {
+    for (const k of extractParams(
+      evaluate(preset.precondition, null, sessionContext.timestamp)
+    )) {
       // Mark channel in case of fault during fetching precondition
       sessionContext.channels[preset.channel] = 0;
       if (typeof k === "string") parameters[k] = Path.parse(k);
     }
+    for (const prov of preset.provisions) {
+      for (const arg of prov.slice(1)) {
+        for (const k of extractParams(
+          evaluate(arg, null, sessionContext.timestamp)
+        )) {
+          // Mark channel in case of fault during fetching precondition
+          sessionContext.channels[preset.channel] = 0;
+          if (typeof k === "string") parameters[k] = Path.parse(k);
+        }
+      }
+    }
   }
 
   const declarations = Object.values(parameters).map((v) => ({
@@ -501,12 +515,22 @@ async function applyPresets(sessionContext: SessionContext): Promise<void> {
         session.configContextCallback(sessionContext, e)
       )
     ) {
+      const provs = p.provisions.map((pp) => [
+        pp[0],
+        ...pp
+          .slice(1)
+          .map((arg) =>
+            evaluate(arg, {}, sessionContext.timestamp, (e) =>
+              session.configContextCallback(sessionContext, e)
+            )
+          ),
+      ]);
       if (blackList[p.channel] === 2) {
         appendProvisionsToFaults[p.channel] = (
           appendProvisionsToFaults[p.channel] || []
-        ).concat(p.provisions);
+        ).concat(provs);
       } else {
-        session.addProvisions(sessionContext, p.channel, p.provisions);
+        session.addProvisions(sessionContext, p.channel, provs);
       }
     }
   }
diff --git a/lib/mongodb-functions.ts b/lib/mongodb-functions.ts
index c36e92e..c98dff1 100644
--- a/lib/mongodb-functions.ts
+++ b/lib/mongodb-functions.ts
@@ -18,7 +18,7 @@
  */
 
 import { ObjectID } from "mongodb";
-import { map, parse, stringify } from "./common/expression-parser";
+import { map, parse, stringify, parseList } from "./common/expression-parser";
 import { likePatternToRegExp, evaluate } from "./common/expression";
 import { Expression, Fault, Task } from "./types";
 
@@ -593,7 +593,7 @@ export function flattenPreset(
   ) {
     p.provision = provision.name;
     p.provisionArgs = provision.args
-      ? JSON.stringify(provision.args).slice(1, -1)
+      ? provision.args.map((a) => stringify(a)).join(", ")
       : "";
   }
 
@@ -650,7 +650,7 @@ export function preProcessPreset(
   };
 
   if (preset.provisionArgs)
-    configuration.args = JSON.parse(`[${preset.provisionArgs}]`);
+    configuration.args = parseList(preset.provisionArgs as string);
 
   delete preset.provision;
   delete preset.provisionArgs;
diff --git a/lib/types.ts b/lib/types.ts
index 4dd4a11..659444f 100644
--- a/lib/types.ts
+++ b/lib/types.ts
@@ -323,7 +323,7 @@ export interface Preset {
   schedule?: { md5: string; duration: number; schedule: any };
   events?: { [event: string]: boolean };
   precondition?: Expression;
-  provisions: string[][];
+  provisions: [string, ...Expression[]][];
 }
 
 export interface Provisions {
diff --git a/ui/presets-page.ts b/ui/presets-page.ts
index ad300fb..52c7cd9 100644
--- a/ui/presets-page.ts
+++ b/ui/presets-page.ts
@@ -43,7 +43,7 @@ const attributes = [
   { id: "events", label: "Events" },
   { id: "precondition", label: "Precondition", type: "textarea" },
   { id: "provision", label: "Provision", type: "combo" },
-  { id: "provisionArgs", label: "Arguments" },
+  { id: "provisionArgs", label: "Arguments", type: "textarea" },
 ];
 
 const unpackSmartQuery = memoize((query) => {