[Spce-user] No rewrite on T.38 INVITE

[Andrew Pogrebennyk]

On 08/17/2015 03:39 PM, Tristan Delsol wrote:
> They state that they don't support that format for the contact header.
> They have it in the specs for the interconnect that the contact header
> can only contain the following:
> sip:+«ISN»@«ip-address/URL»:«port» with optional user=”phone”, so for
> example sip:+31703434343 at domain.net:5060;user=”phone”.
> 
> Where
> ISN: International Subscriber Number
> port: UDP portnumber;
> URL: Uniform Resource Locator: domain name;
> 
> Is it possible I can adjust the contact header for this kind of request
> to keep the format as needed?

Unfortunately this is not something you can easily achieve, but if you
have some understanding of kamailio config scripts you can try to modify
/etc/ngcp-config/templates/etc/kamailio/lb/kamailio.cfg.tt2
and disable the Contact masking completely, e.g. comment out all calls
of ROUTE_MASK_CONTACT and ROUTE_UNMASK_CONTACT as a starting point.

Then each side will receive the internal IP of b2b as Contact:
sip:127.0.0.1:5080, which exposes your topology a bit to outside but
still doesn't break the protocol. But we are not sending the number part
which might be a problem for them (they didn't say that the number part
is optional). Sorry I can't help you out more at this time.

Regards,
Andrew