It should automatically re-use an existing TCP connection.
Can you give an example?
What I usually see is that the CPE has REGISTERed over TCP from an
ephemeral TCP port, has given a Contact with a public port (5060,
usually), and that the INVITE has a RURI with (implicit or explicit)
port 5060 in it, which means that kamailio must attempt a new
connection (because it doesn't have an existing TCP connection to the
customer-side port 5060). Is this what's happening for you?
Perhaps you can look at the nathelper module for use of the
add_contact_alias() function. Even if this is not related to REGISTER
requests, it still might work for you.
On Mon, 6 Mar 2023 at 09:55, Benoit Panizzon <benoit.panizzon(a)imp.ch> wrote:
CPE behind Firewall, registering to Kamailio via TCP (or TLS).
When a call is sent to the CPE, kamailio attemts to open a new TCP
connection and is blocked by Firewall.
Is there an option to tell kamailio to use the existing registered TCP
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