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Summary:ASTERISK-06812: SIP_HEADER documentation
Reporter:Ove Aursand (aurs)Labels:
Date Opened:2006-04-19 07:42:10Date Closed:2011-06-07 14:08:02
Priority:MinorRegression?No
Status:Closed/CompleteComponents:Functions/General
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Description:show function SIP_HEADER tells me:
[Synopsis]
Gets or sets the specified SIP header

When I try to set a SIP header, I get this error:

Apr 19 14:35:56 ERROR[5823]: pbx.c:1412 ast_func_write: Function SIP_HEADER is read-only, it cannot be written to

****** ADDITIONAL INFORMATION ******

From the dialplan:

exten => 543,1,Dial(SIP/123)
exten => 543,2,Set(SIP_HEADER(TO)="test")
exten => 543,3,Hangup
Comments:By: Matt O'Gorman (mogorman) 2006-04-26 15:36:57

you can not change the sip header after it has been sent.   You have to do a set sip header before the dial