[Freeswitch-users] Add new headers with APIs

[Alex Balashov]

Hi Sayyed,

First of all, it is best-practical for custom SIP headers to have names 
that start with X- (e.g. X-Token), which will ensure that the header 
will be treated by all upstream implementations as a custom header and 
not interpreted or filtered out before relay.

That said, to create a new header on the B leg, you can just set a 
channel variable with the name: sip_h_X-Token.  In the XML dial plan, 
this would look like:

    <action application="set" data="sip_h_X-Token=abc123"/>

There's no reason you can't also do this in an API call, which provides 
the ability to set channel variables, and also access to the dialplan 
application that does so.

For instance, I use ESL Outbound in Javascript and do something like this:

    conn.execute('set', 'sip_h_X-Token=abc123');

Your actual implementation will vary depending on the nature of the API 
you're using (ESL inbound, ESL outbound, mod_curl_xml (if that can be 
called an API)), and, of course, the language environment and any 
libraries employed.

-- Alex

-- 
Alex Balashov - Principal
Evariste Systems LLC
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