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.

James

On Mon, 6 Mar 2023 at 09:55, Benoit Panizzon benoit.panizzon@imp.ch wrote:

Hi List

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 connection?

Mit freundlichen Grüssen

-Benoît Panizzon-

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