I am writing a dialplan context under asterisk 11.21.0 to handle SIP message routing between registered SIP peers using chan_sip. I am having trouble with double-quotes when the source peer uses a display name, which appears in quotes before the SIP URI. I
want to extract the SIP URI from MESSAGE(from) in order to (conditionally) route a failure message back to the source peer.
My test dialplan sets up variables like these:
exten => _X.,n,Set(RX=".*<(.+)>")
exten => _X.,n,Set(T1="Example name" <sip:[email protected]>)
If I just apply the regex operator (:) on T1 using regexp RX, like this:
exten => _X.,n,Set(FROM_SIPURI=$[${T1}:${RX}])
...I get this syntax error:
[2016-08-08 15:04:02] WARNING[1653][C-00000000]: ast_expr2.fl:470 ast_yyerror:
ast_yyerror(): syntax error: syntax error, unexpected ':', expecting '-' or '!' or
'(' or '<token>'; Input:
"Example name" <sip:[email protected]>:".*<(.+)>"
^
(caret points at the colon character)
If I enclose the T1 variable in double quotes, like this:
exten => _X.,n,Set(FROM_SIPURI=$["${T1}":${RX}])
...I get this syntax error:
[2016-08-08 15:05:40] WARNING[1653][C-00000000]: ast_expr2.fl:470 ast_yyerror:
ast_yyerror(): syntax error: syntax error, unexpected '<token>', expecting
$end; Input:
""Example name" <sip:[email protected]>":".*<(.+)>"
^
(caret points at letter E)
If I use the QUOTE() function to quote the double quotes before applying the
regexp, like this:
exten => _X.,n,Set(FROM_SIPURI=$[${QUOTE(${T1})}:${RX}])
... I get this syntax error:
[2016-08-08 14:53:35] WARNING[1653][C-00000000]: ast_expr2.fl:470 ast_yyerror:
ast_yyerror(): syntax error: syntax error, unexpected '<token>', expecting
$end; Input:
"\"Example name\" <sip:[email protected]>":".*<(.+)>"
^
(caret points at letter E)
Currently I am working around the issue by using REPLACE() to strip all
double-quotes, but I believe this is not a correct solution. How should I write
the $[ expression so that the double-quotes are handled correctly?
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