Yealink SIP-T2XP - Why does the phone display Network Unavailable?; Why does the permission denied when uploading files to a FTP server?

Yealink IP Phones Auto provisioning Guide
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The following shows an example of a replace rule file:
<DialRule>
<Data Prefix="1" Replace="05928665234" LineID=""/>
<Data Prefix="2(xx)" Replace="002$1" LineID="0"/>
</DialRule>
####################################################
## Upload replace rule file ##
####################################################
dialplan_replace_rule.url =
For example, enter “tftp://192.168.1.100/DialPlan.xml” in the “dialplan_replace_rule.url =”
field. During the auto provisioning process, the phone connects to the provisioning
server “192.168.1.100”, and downloads the replace rule file “DialPlan.xml”.
You can create dial-now rules directly in configuration files, or create multiple dial-now
rules using the supplied dial-now rule template file. The existing dial-now rules on the
phones will be overwritten by the downloaded dial-now rules.
When editing a dial-now file, learn the following:
 <DialNow> indicates the start of the template file and </DialNow> indicates the
end of the template file.
 Create dial-now rules between <DialNow> and </DialNow>.
 When specifying the desired line(s) for the dial-now rule, valid values are 0 and
line ID. The digit 0 stands for all lines. Multiple line IDs are separated by commas.
Specifying the desired line(s) to apply dial-now rules is not applicable to
SIP-T19P/CP860 IP phones.
 At most 100 dial-now rules can be added to the IP phone.
 For the basic expression syntax of the dial-now rule, refer to Yealink phone-specific
user guide.
To customize a dial-now file:
1. Open the template file using an ASCII editor.
2. For each dial-now rule you wish to add, add the following string to the file. Each
starts on a separate line:
<Data DialNowRule=”” LineID=""/>
Where:
DialNowRule=””/ rule=”” specifies the dial-now rule.
LineID=””/ lines=”” specifies the desired line(s) for this rule. When you leave it