Based on the logs, there is no  check_route_param() executed. Actually, it is an initial INVITE, doesn't have a to-tag, so there is no Route header added previously by kamailio where check_route_param() can work on.

Looking at the headers, this initial INVITE has Via and Contact with public addresses (maybe UA is using stun), only the SDP seems to have carrier grand nat address. You have to adjust the parameter for nat_uac_test() in order to detect it is a natted call.

Cheers,
Daniel

My kamailio version is:

version: kamailio 4.4.6 (x86_64/linux) becbde
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: becbde
compiled on 08:18:45 Jul  3 2017 with gcc 5.4.0

I've pasted the logs below.

 
( ... )

Thanks!

2018-02-15 15:02 GMT+01:00 Daniel-Constantin Mierla <miconda@gmail.com>:

Hello,

first, what is the version of kamailio?

Then, can you load debugger module and set cfgtrace=1, then send here all log messages for a case exposing this issue? It should show what actions are executed from config.

Cheers,
Daniel

On 15.02.18 12:08, Pau Giralt wrote:

Hi!

I'm working with kamailio and rtpproxy.
When I configure the clients to send sip messages through TCP adding the ";transport=tcp" in the sip message the rtpproxy is not working anymore.

The code is never passing the point pasted below, inside route[NATMANAGE] in kamailio.cfg

if (!(isflagset(FLT_NATS) || isbflagset(FLB_NATB))) return;

Therefore, rtpproxy_manage("co"); is never reached.

Could it be a parsing problem? ( check_route_param("nat=yes") )

The config file is exactly the same as the one provided in the kamailio repository (the default one)

Thanks!

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-- 
Daniel-Constantin Mierla
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio Advanced Training - March 5-7, 2018, Berlin - www.asipto.com
Kamailio World Conference - May 14-16, 2018 - www.kamailioworld.com

-- 
Daniel-Constantin Mierla
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio Advanced Training - March 5-7, 2018, Berlin - www.asipto.com
Kamailio World Conference - May 14-16, 2018 - www.kamailioworld.com