[Serusers] Security methods for PSTN termination of SIP calls

[Marian Dumitru]

Hi Alan,

Excepting source IP check (which is not reliable), you can also use 
authentication between server - SIPproxy2 authenticates all request sent 
to SIP proxy1 and vice-versa.

Since the end points are fixed (PSTN GWs), you can create IPSEC tunnels 
to transport the signaling part. Tunneling also the media will probably 
introduce delay and will require some really performat machines :-).

Also you can go for TLS, which is as concept basically the same thing 
IPSEC tunnels. The major difference is that TLS is not free as IPSEC is.

Best regards,
Marian

Alan Litster wrote:
> Hi,
> 
> When providing PSTN termination of calls that originate from a SIP source
> how do you go about validating the identity of where the calls originated
> from - the SIP Proxy or the SUA.
> 
> PSTN ---- SIP Proxy 1--- + --- SIP Proxy 2 ---- PSTN
> 
> So the calls originate from the PSTN in a country, get transported across
> the internet and terminated in a different country via another company.
> Other than source IP address, what method could you use to validate the
> origin of the calls? Also in question is security for trunk services for
> companies that simply want to terminate calls out onto the PSTN. How can you
> setup a trust relationship between the two proxies?
> 
> Is any one here in a similar situation??
> 
> Regards,
> 
> Alan
> 
> 
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