The normal FS behaviour is to just use a uuid, but you could implement this manually with:

<action application="bridge" data="[sip_invite_call_id=${create_uuid()}@${hostname}]sofia/profile/number@a.b.c.d"/>

Of course doing this for every originate/bridge would be tedious.

There's no requirement in SIP for it to be of the uuid@host format, it's simply defined as a byte string. Is there a specific reason you need it to be so? If you wish you could submit a patch to add this option via a profile flag.

On 16 December 2014 at 12:29, Doron Kruh <doron@lexifone.com> wrote:
Hi All,

How can I make sure the SIP Call-Id header sent by Freeswitch when originating a new call is in the form of: uuid@host ?

Thank you,

Doron 



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