27 Dec
2022
27 Dec
'22
12:35 p.m.
Hi,
On Dec 23, 2022, at 2:15 AM, Benoît Panizzon
<benoit.panizzon(a)imp.ch> wrote:
So towards some 'endpoints' I would need an IP in the Via and towards
others I would need a hostname.
Could this dimension of the problem, at least, perhaps be solved with two listeners,
albeit on different ports, which have different 'advertised' addresses?
listen=udp:1.1.1.1:5060 advertised 2.2.2.2:5060
listen=udp:1.1.1.1:5070 advertised dns.fqdn.host:5060
But I realised, we most probably have to re-consider
our idea to run
all our kamailio instances in a load-balanced DMQ master-master set-up.
A CPE, even when the NAPTR entry or DNS Hostname it registers to points
to multiple registrar instances, in the end registers to ONE ip address.
In a NAT scenario, this is the IP which the SIP ALG on the customer
firewall handles.
In a Master-Master registrar scenario, the INVITE towards a CPE might
originate from the IP of the registrar that CPE did not register to
and therefore the SIP ALG not knowing about and never make it through
NAT.
I do agree that this approach is a bit idealistic, mostly because of NAT.
This is the problem SIP Outbound (RFC 5626) was created to solve, but it requires rather
explicit support on the CPE, which, at the last time I last looked into it, did not seem
to be widespread.
-- Alex
--
Alex Balashov | Principal | Evariste Systems LLC
Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/