27 Sep
2018
27 Sep
'18
11:50 p.m.
Hi,
first of all you definitely do not want to put the contact received in the
INVITE in the 200 OK, since you will, in the best case generate a loop of
the UAC sending the ACK to itself.
About having to call msg_apply_changes this comes probably by the fact that
you've already manipulated the header with fix_nated_contact(). Due to
kamailio's internals you cannot change the headers twice in a row without
invoking msg_apply_changes().
For your main problem with the ACK, I'd rather look at the Record-Route. I
see in the 200 OK that Record-Route has a private IP. Unless the caller is
on the same network or on a network that can communicate with your server,
you need to have there a public address (or a double Record-Route if your
server is running on two interfaces).
Have a look at "advertise" parameter of listen directive and to
http://www.kamailio.org/docs/modules/devel/modules/rr.html#rr.p.enable_doub…
.
Best regards,
Federico
On Tue, Sep 25, 2018 at 12:24 AM Ben Hood <ben(a)relops.com> wrote:
On 24 Sep 2018, at 23:04, Alex Balashov
<abalashov(a)evaristesys.com>
wrote:
On Mon, Sep 24, 2018 at 10:46:44PM +0100, Ben Hood wrote:
> I was trying (as a temporary hack) to mangle this to become
>
> Contact: <sip:2018092417381900003@81.x.x.x
<sip:2018092417381900003@81.x.x.x>>
But that's not grammatically valid…
You are absolutely correct, but I don’t think that is what I wrote (might
be a typo from me?). I was trying to produce:
Contact: <sip:2018092423082500003@81.x.x.x>
Which I have now achieved by adding
msg_apply_changes();
after the invocation of subst_hf().
Seems that the SIP buffer needs to be explicitly finalised before
transport.
However, my theory about patching the Contact header to make the remote
system happy is wrong - the 200 OK is still not ACK’ed. So I need to look
into the NAT’ing a bit more to see what might be going on - but this is a
different question to how to use subst_hf().
Many thanks for helping me out with this, very much appreciated.
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