It looks like these settings are poorly doc'ed on the wiki.  This should be the one you need.  Could someone clean up the docs on sofia gateway params?

https://wiki.freeswitch.org/wiki/Authentication

caller-id-in-from

On Nov 22, 2013, at 4:09 AM, Remco van Vugt <remconl87@gmail.com> wrote:


Hi,

I have the following issue: a carrier wants the A number in the contact field i.e.: Contact: <sip:+31xxxxxxxxx@ip.ad.dr.ess;[add. params]>

I know; the contact is not up to the called party but they want it anyway. I spent quite some time, and I found some earlier mailing list threads but no answer that solves my particular problem.

I noticed that by setting the extension parameter in the gateway configuration, this results in the desired header format. However, this is not dynamic and therefore not the A number (freeswitch runs in a SBC configuration, passing traffic in and out of the network). Is there any way to either pass the extension= parameter from the dialplan or somehow change the contact header?

Thanks,
Remco

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