GET https://sandbox.mont.ru/contentApi/version3/service/ContentServiceV3Xml.svc/GetDefaultMenu?langcode=RU

<MenuContract xmlns="http://schemas.datacontract.org/2004/07/ContentServer2.WebService.Services.Version3.Contracts" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
    <MenuElements>
        <MenuElementContract>
            <FamilyGroupIds xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays"/>
            <Id>1</Id>
            <Imageurl i:nil="true"/>
            <LegacyId>1</LegacyId>
            <Level>1</Level>
            <OrderIndex i:nil="true"/>
            <ParentId i:nil="true"/>
            <Title>5Nine Software</Title>
        </MenuElementContract>
        <MenuElementContract>
            <FamilyGroupIds xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
                <a:int>177</a:int>
                <a:int>179</a:int>
                <a:int>4349</a:int>
            </FamilyGroupIds>
            <Id>2</Id>
            <Imageurl i:nil="true"/>
            <LegacyId>2</LegacyId>
            <Level>2</Level>
            <OrderIndex i:nil="true"/>
            <ParentId>1</ParentId>
            <Title>Виртуализация</Title>
        </MenuElementContract>
        <!-- массив семейств -->
        <MenuElementContract>
            <FamilyGroupIds xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
                <a:int>4472</a:int>
            </FamilyGroupIds>
            <Id>176</Id>
            <Imageurl i:nil="true"/>
            <LegacyId>1287</LegacyId>
            <Level>2</Level>
            <OrderIndex i:nil="true"/>
            <ParentId>175</ParentId>
            <Title>Развлечения и игры</Title>
        </MenuElementContract>
    </MenuElements>
    <Version>0</Version>
</MenuContract>

https://sandbox.mont.ru/ContentAPI/Version3/Service/ContentServiceV3.svc

<GetDefaultMenu>
  <MethodParameters>
    <langCode>RU</langCode>
  </MethodParameters>
</GetDefaultMenu>

<GetDefaultMenu>
  <MethodParameters>
    <MenuContract>
      <MenuElements attr0="MenuElementContractArray" isNull="false">
        <MenuElementContractArray0>
          <FamilyGroupIds attr0="Int32Array" isNull="false" />
          <Id>1</Id>
          <Imageurl isNull="true" />
          <LegacyId>1</LegacyId>
          <Level>1</Level>
          <OrderIndex isNull="true" />
          <ParentId isNull="true" />
          <Title>5Nine Software</Title>
        </MenuElementContractArray0>
        <MenuElementContractArray1>
          <FamilyGroupIds attr0="Int32Array" isNull="false">
            <Int32Array0>177</Int32Array0>
            <Int32Array1>179</Int32Array1>
            <Int32Array2>4349</Int32Array2>
          </FamilyGroupIds>
          <Id>2</Id>
          <Imageurl isNull="true" />
          <LegacyId>2</LegacyId>
          <Level>2</Level>
          <OrderIndex isNull="true" />
          <ParentId>1</ParentId>
          <Title>Виртуализация</Title>
        </MenuElementContractArray1>
        <!-- массив семейств -->
        <MenuElementContractArray175>
          <FamilyGroupIds attr0="Int32Array" isNull="false">
            <Int32Array0>4472</Int32Array0>
          </FamilyGroupIds>
          <Id>176</Id>
          <Imageurl isNull="true" />
          <LegacyId>1287</LegacyId>
          <Level>2</Level>
          <OrderIndex isNull="true" />
          <ParentId>175</ParentId>
          <Title>Развлечения и игры</Title>
        </MenuElementContractArray175>
      </MenuElements>
      <Version>0</Version>
    </MenuContract>
  </MethodParameters>
</GetDefaultMenu>