[asterisk-users] SIP_HEADER() read-only

[Douglas Garstang]

The problem is that I am trying to pass call state variables BETWEEN Asterisk servers. IAX doesn't seem to support this. One option was to add SIP headers on the first system, trunk the call with SIP instead of IAX, and then get them at the other end.

> -----Original Message-----
> From: Eric "ManxPower" Wieling [mailto:eric at fnords.org]
> Sent: Thursday, August 03, 2006 10:38 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] SIP_HEADER() read-only
> 
> 
> I don't understand what the problem is.  If you want to pass 
> a variable 
> set the variable, but prefix it with __ (2 underscores)
> 
> Set(__DNID=${DNID})
> 
> Douglas Garstang wrote:
> > Oh... That's real nice. I was considering using SIP instead 
> of IAX to trunk calls between Asterisk boxes as IAX has some 
> severe limitations in regards to passing variables. A few 
> people said 'use SIP!' because you can set the SIP headers. 
> Looks like that isn't an option!
> > 
> >> -----Original Message-----
> >> From: Vincent Regnard [mailto:devel at regnard.org]
> >> Sent: Thursday, August 03, 2006 4:29 AM
> >> To: Asterisk Users Mailing List - Non-Commercial Discussion
> >> Subject: Re: [asterisk-users] SIP_HEADER() read-only
> >>
> >>
> >>
> >>
> >> There is presently no .write member in the structure 
> declaration for 
> >> this function in channels/app_sip.c:
> >>
> >> static struct ast_custom_function sip_header_function = {
> >>          .name = "SIP_HEADER",
> >>          .synopsis = "Gets or sets the specified SIP header",
> >>          .syntax = "SIP_HEADER(<name>)",
> >>          .read = func_header_read,
> >> };
> >>
> >> So I imagine the answer to my question is yes SIP_HEADER is a 
> >> read-only 
> >> function. There is no implementation equivalent to 
> SipAddHeader() for 
> >> SIP_HEADER().
> >>
> >>
> >>
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