[SIPForum-discussion] Does SIP-Softphone have a public contact, if using STUN?

[Paul Kyzivat]

On 1/11/16 8:25 AM, Rodrigo Pimenta Carvalho wrote:
> Dear SIP-users,
>
>
>
> I have a softphone behind a NAT. When it registers itself on the SIP
> Proxy (Registrar), the proxy keeps the Contact of such softphone with a
> local IP. That is, the Contact value makes sense only behind the NAT,
> not for peers on Internet, for example. So I ask:
>
>
> 1 - I intend to configure a stun server for my softphone, because I
> suspect that it will registers itself using a public IP for the Contact.
> Is my intention right?  I mean, by configuring a stun server for the
> softphone, should it expose its public IP to the proxy, in the Contact
> header fields of SIP messages. Ex: SIP OK, when answering a call?
>
>
> 2 - I'm using ZOIPER here, as softphone. Does someone here have already
> configured ZOIPER to use a stun server? Did it worked like I'm intending
> to do?
>
>
> For my case, the configuration of a stun server in my softphone doesn't
> take effect. I will have to look for how to make it work...
>
>
> Any hint will be very helpful!

A GRUU (RFC5627) is designed for use in cases like this where your local 
address isn't globally routable.

Of course this is only an option for you if your registrar supports it.

	Thanks,
	Paul

> Best regards.
>
>
>
> RODRIGO PIMENTA CARVALHO
> Inatel Competence Center
> Software
> Ph: +55 35 3471 9200 RAMAL 979
>
>
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