> Robert Joly wrote:
> > Hi,
> > I need to modify the Freeswitch default context generated by
> > sipXconfig to include a line that is going to assist in entering
> > conferences without being prompted by a PIN. Ultimately, I
> want the
> > generated output to contain a line of the form:
> >
> > <action application="set"
> > data="supplied_pin=${sip_h_X-ConfPin}"/>
> >
> > I thought that doing this would be a simple matter of modifying the
> > .../neoconf/etc/freeswitch/default_context.xml.vm to
> include that line
> > until I realized that the line I want ot add contains a
> > "${sip_h_X-ConfPin}" string which collides with the syntax that
> > Velocity employs for variables. For the reference,
> > "${sip_h_X-ConfPin}" is a construct that is useful to
> freeswitch and
> > therefore needs to appear verbatim in the generated output.
> >
> > I started looking at character escaping in Velocity and saw
> that the '\'
> > is used for escaping reserved characters. In that spirit,
> I modified
> > the default_context.xml.vm file to include the following line:
> >
> > <action application="set"
> > data="supplied_pin=\$\{sip_h_X-ConfPin\}"/>
> >
> > ...but to my surprise, the generated output didn't escape anything:
> >
> > <action application="set"
> > data="supplied_pin=\$\{sip_h_X-ConfPin\}"/>
> >
> > I then took out all escaping in the default_context.xml.vm and was
> > left with the following line:
> >
> > <action application="set"
> > data="supplied_pin=${sip_h_X-ConfPin}"/>
> >
> > ...and to my surprise, the generated output was exactly what I need:
> >
> > <action application="set"
> > data="supplied_pin=${sip_h_X-ConfPin}"/>
> >
> > After consulting with Huijun, the best exaplaination is
> that Velocity
> > didn't see ${sip_h_X-ConfPin} as a defined variable for the context
> > and therefore left it unsustituted. Although this is producing the
> > output I ultimately want, I have a feeling that this is not
> the best
> > way to achieve this for a person 'skilled in the art' and
> is why I'm
> > turning to the list. What is the correct way of creating a
> Velocity
> > template such the the generated output will be <action
> application="set"
> > data="supplied_pin=${sip_h_X-ConfPin}"/>?
> >
>
>
> Escaping in VTL is not really implemented correctly and
> relying on variable not being in the context is kind of scary.
> So after many attempts to find a more elegant solution we
> ended up using $dolar variable. It's available automatically
> in the context (sipXconfig adds it).
>
> You should use:
> <action application="set"
> data="supplied_pin=${dollar}{sip_h_X-ConfPin}"/>
Very nice - thank you.
> BTW: I am pretty sure this technique is used in default_context.xml.vm
It does but I wasn't sure about the '{' and '}' but now I understand.
Thanks.
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