9 Jan
2018
9 Jan
'18
2:19 p.m.
Many thanks, I've managed to handle a call properly.
I really want to thank Daniel, and all that have helped on this subject.
Regards
J.
On Mon, Jan 8, 2018 at 11:42 PM, Joel Serrano <joel(a)gogii.net> wrote:
Just a hint here, try setting $du and then t_relay...
On Mon, Jan 8, 2018 at 11:55 Jean Cérien <cerien.jean(a)gmail.com> wrote:
Hi
While I'm trying to get the provider fix the SBC, I am implementing the
workaround.
Almost done here, storing and retrieving the correct address is fine, but
when I set my $ru to the corrected value (asterisk IP), the t_relay still
sends the packet to the kamailio IP -
$ru="sip:number@asteriskip:5060";
if (!t_relay()) {
....
Why would the t_relay forward to the kamailio IP and not the asterisk ?
Rgds
J
On Mon, Jan 8, 2018 at 11:49 AM, Jean Cérien <cerien.jean(a)gmail.com>
wrote:
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Many, many thanks !
I've posted the full dialog unredacted here: https://pastebin.com/
EE9iwgZf
The OK from Kamailio back to VOIP provider has
Record-Route: <sip:KAMAILIOIP;lr=on;ftag=SD2rbta01-8dd0e72b-0016-0379-
0000-0000;did=e0c.e0a1>
Contact: <sip:NUMBER@ASTERISKIP:5060>
So my understanding is that the ACK should be
ACK sip:NUMBER@ASTERISKIP:5060 SIP/2.0
....
and not
ACK sip:NUMBER@KAMAILIOIP:5060 SIP/2.0
Am I understanding correctly ?
Rgds
J
On Mon, Jan 8, 2018 at 11:28 AM, Sebastian Damm <damm(a)sipgate.de> wrote:
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Hi,
On Mon, Jan 8, 2018 at 2:39 PM, Jean Cérien <cerien.jean(a)gmail.com>
wrote:
>
> Thanks for this answer. The voip provider is not really eager to alter
> its SBC as it considers that the contact field is not mandatory in the ACK.
> The RFC states (section 8.1.1.8)
>
The problem is not that the ACK doesn't carry a Contact header. The
problem is that the ACK is constructed incorrectly. This is what the RfC
says to UAC behavior (section 12.1.2):
The route set MUST be set to the list of URIs in the Record-Route
header field from the response, taken in reverse order and preserving all
URI parameters. If no Record-Route header field is present in the response,
the route set MUST be set to the empty set. This route set, even if empty,
overrides any pre-existing route set for future requests in this dialog. *The
remote target MUST be set to the URI from the Contact header field of the
response.*
This is what the carrier's SBC gets wrong. It doesn't address your
Asterisk but instead addresses your Kamailio, although the Contact of your
200 OK (hopefully) contains the Asterisk IP.
Please verify that your 200 OK going to the carrier actually does carry
a Contact header with the Asterisk IP, but if it does, section 12.1.2 of
the SIP RfC could help when arguing with the carrier.
Regards
Sebastian
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