[Serusers] Call type processing Section problem?

[Juan]

Hi.
Till now I was happy using SER handling communications between UAs using
nathelper and RPT proxy.
Now I changed the ser.cfg script to the one with PSTN support and none of
the UAs get registered.
I am getting a 403 Forbidden.
Analyzing the script I understood that this 403 was coming from the Call
Type Processing Section so I changed 
if (!is_uri_host_local()) {
    if (is_from_local() || allow_trusted()) { and so on
to
if (uri!=myself)
and now the UAs are registering again.
But of course I can't make calls. 
So I would like to know how this< is_uri_host_local and is_from _local>
work and what should I do to make them allow my UAs to register.
Thanks in advance
 
Juan Ferrari
 
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