[OpenSIPS-Users] Failed to engage rtpproxy for trunk

[Saint Michael]

I keep getting this error:
SCRIPT: Failed to engage rtpproxy for trunk XX.XXX.XX.135 -
104678ZWJjOWU2ZDlkZWQ3MmE0MThjZWEzNTNlMzVhOTVhYTg
 ERROR:rtpproxy:force_rtp_proxy_body: incorrect port 0 in reply from rtp proxy

The call comes from another opensips box with rtpproxy enabled.
On connect, I get this SDP from the carrier

Content-Length: 209

        v=0
        o=- 655206240 655206240 IN IP4 XXX.XX.XX.XX
        s=ENSResip
        c=IN IP4 XX.XX.XX.XX
        t=0 0
        m=audio 18634 RTP/AVP 0 101
        a=rtpmap:0 PCMU/8000
        a=rtpmap:101 telephone-event/8000
        a=fmtp:101 0-15
        a=ptime:20

My proxy's configuration is

 cat rtpproxy1.service
[Unit]
Description=RTPProxy1
After=network.target
Requires=network.target

[Service]
Type=forking
PIDFile=/var/run/rtpproxy1.pid
#Environment='OPTIONS= -F -L 10240 -m 20000 -M 30000 -T 20 -d INFO:LOG_LOCAL5'

Restart=on-failure
RestartSec=5


ExecStart=/usr/local/bin/rtpproxy -p /var/run/rtpproxy1.pid -l pub.lic.i.p \
   -s udp:127.0.0.1:7890 -F -L 10240 -m 10000 -M 15000 -T 20 -d
WARN:LOG_LOCAL5 -n tcp:127.0.0.1:7889
ExecStop=/usr/bin/pkill -F /var/run/rtpproxy1.pid


StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=rtpproxy1
SyslogFacility=local5

TimeoutStartSec=10
TimeoutStopSec=10

[Install]
WantedBy=multi-user.target
----------------------
version:
version: opensips 3.1.10 (x86_64/linux)
flags: STATS: On, DISABLE_NAGLE, USE_MCAST, SHM_MMAP, PKG_MALLOC,
Q_MALLOC, F_MALLOC, HP_MALLOC, DBG_MALLOC, FAST_LOCK-ADAPTIVE_WAIT
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16,
MAX_URI_SIZE 1024, BUF_SIZE 65535
poll method support: poll, epoll, sigio_rt, select.
git revision: 45c8875d5
main.c compiled on 12:08:55 Jul  4 2022 with gcc 9
--------------------------------
there is a single call open, no traffic, for this is a development box


Any idea?