only partially correct here.  The main place fs_path is inserted is based on the nat detection settings you configure in freeswitch itself.  When we get a registration that's detected behind nat we write down the ip/port the request came from in fs_path before we store the registration, the. when calling that ref we will send the invite to that ip/port

On Thu, Jan 5, 2017 at 7:16 AM Vladyslav Zakhozhai <v.zakhozhai@gmail.com> wrote:

Hi David,

there is no magick with fs_path. fs_path contains value from Path header of a request which comes from sip proxy, i.e. kamailio. It means that replies and SIP requests from freeswitch to UAC will traverse SIP proxy which should be on the path.

For example,

Request: UAC ==> SIP proxy/load balancer ==> freeswitch box

Reply: freeswitch box ==> SIP proxy/load balancer ==> UAC

Request (INVITE): freeswitch box ==> SIP proxy/load balancer ==> UAC

Without path specified freeswitch will send direct messages to UAC:

Request: UAC ==> SIP proxy ==> freeswitch box

Reply: freeswitch box ==> UAC

This behaviour may be undesirable.

So SIP proxy inserts itself to Path header and freeswitch recognizes it and add fs_path tag to contact.

2017-01-05 6:14 GMT+02:00 David Villasmil <david.villasmil.work@gmail.com>:

Hello guys,

I've been wondering where the "fs_path" parameter comes from? How is it built, etc? I've been seeing cases where when the client has no "fs_path", fs can't find the user and returns temp unavailable...

Thanks all,

David

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--

С уважением,
Владислав Захожай

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