[Serusers] Security methods for PSTN termination of SIP calls

[Alan Litster]

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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