SPA 50X and XML Application URL

Question

Hello Guys,
I made a XML application which runs just fine on a SPA 525 but not on the SPA 502 (have not tested on other 50X phones).
The issue is that the URL I return in a MenuItem for the tag <url> gets cut by the phone when it request it.
The Flow is
Phone Requests
http://192.168.9.207/MyPhoneBridge/myphonebridge.aspx?extension=102&model=SPA123
and gets in return
<?xml version="1.0" encoding="UTF-8"?>
<CiscoIPPhoneMenu><Title>Bla BLa</Title>
<Prompt>Bla Bla Bla</Prompt><MenuItem>
<Name>Name1</Name>
<URL>http://192.168.9.207:80/MyPhoneBridge/myphonebridge.aspx?extension=102&model=SPA123&extensionstatus=yes</URL>
</MenuItem>
<MenuItem>
<Name>Name1</Name>
<URL>http://192.168.9.207:80/MyPhoneBridge/myphonebridge.aspx?extension=102&model=SPA123&presenceinfo=yes</URL>
</MenuItem>
<MenuItem>
<Name>Name3</Name>
<URL>http://192.168.9.207:80/MyPhoneBridge/myphonebridge.aspx?extension=102&model=SPA123&fwdrules=yes</URL>
</MenuItem>
<SoftKeyItem><Name>Select</Name><URL>SoftKey:Select</URL><Position>1</Position></SoftKeyItem><SoftKeyItem><Name>Exit</Name><URL>Key:Services</URL><Position>2</Position></SoftKeyItem></CiscoIPPhoneMenu>
Which ever entry i select now, i only see the request from the phone for http://192.168.9.207:80/MyPhoneBridge/myphonebridge.aspx?extension=102 
All Arguments are cut. The this play then writes
XML format error or invalid application

Answer 1

Note that there is XML Phone Applications space dedicated to XML Phone Applications questions.
But it seems to be rather obvious issue. '&' is not allowed char in URL (it is generic rule, nothing special for SPA502). Such special char needs to be escaped accordingly. So replace all occurrences of '&' by '&amp;'. It should help.
By the way, it is mentioned in documentation.
Rate useful advices. It will help others to search solutions.