[Freeswitch-users] how to extract arbitrary sip header value

Michael Jerris mike at jerris.com
Mon Apr 18 18:39:16 MSD 2016

if you uuid_dump the channel
you can see everything that it has. quickest way to get your answer

On Monday, April 18, 2016, Miroslav Levanic <Miroslav.Levanic at enghouse.com>

> I’m using switch_channel_get_variable to extract sip headers with already
> predefined channel variables (
> https://freeswitch.org/confluence/display/FREESWITCH/Channel+Variables).
> I’ve found that some undefined sip headers can be extracted using only
> ‘sip_’ prefix (for instance ‘sip_P-Preferred-Identity’) and some using
> ‘sip_h_’ prefix (like is ‘sip_h_Diversion’).
> Is there some rule or detailed explanation when to use just ‘sip_’ or
> ‘sip_h_’ in the name of the required channel variable?
> Thanks,
> Miro
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