Hey Max,

You should know that pstn.gw_ip is not a keyword in Kamailio and it could've been pstn.lol_gw or anything. What really matters is that you know where this gw_ip is being used in configuration. Somewhere in the kamailio.cfg you'll see a PSTN route which will be doing some RURI checks and then checking is pstn.gw_ip is not empty, and after that it just modifies the RURI to contain this variable "pstn.gw_ip" value in the Request Domain part so when t_relay() is called the call exits out to that IP or Host.

You should search up on kamailio about DNS hostname auto-resolution and if your provider has DNS SRV working how Kamailio will work with it.

Regards, Sammy

On Mon, Nov 2, 2015 at 8:05 AM, Max maxim.suraev@campus.tu-berlin.de wrote:

Hi.

I'd like to use Kamailio as a SIP proxy routing calls to upstream SIP provider. As far as I've understood the parameters I should set are:

pstn.gw_ip = "" desc "PSTN GW Address" pstn.gw_port = "" desc "PSTN GW Port"

The problem is that my upstream provider uses dynamic IP for its server. How can I use hostname instead of ip.

From what I see in route[PSTN] example it seems like it should just work if I use pstn.gw_ip = "sip.myprovider.lol" desc "My upstream SIP host"

But if so - why the confusing name? And if not - how do I make it work? Is there pstn.gw_host or smth like that?

regards, Max.

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