[asterisk-dev] Dialplan oddities with recent Asterisk ?

[Klaus Darilion]

Am 09.02.2010 17:03, schrieb Nick Lewis:
> Is '&' ever an acceptable character in a SIP URI? If so, Asterisk needs
> to
> escape these things. If not, would it not be prudent to have the
> dialplan
> parser simply not accept invalid characters?

Actually it is not only about '&'. Dialplans are much more complex and 
${EXTEN} is used for many other things (e.g. making a database query or 
calling exec()). Thus, other commands/applications/functions have 
different special characters.

regards
klaus


>
> '&' is an unreserved character in the relevant portion of a SIP URI.
> Even if it where not an unreserved character it would still be
> representable in an encoded form that would be decoded before chan_sip.c
> hands the extension to the pbx. In general the pbx can expect chan_sip.c
> to provide extensions containing any ascii chars (even unprintable ones)
> except CR and LF.
>
> -- N_L
>
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