[OpenSIPS-Users] Problem with force_send_socket

Olle Frimanson olle at zaark.com
Thu Mar 22 13:17:52 EDT 2018

Hi , we are using Opensips 2.3.3 and have a setup with 


UAC- Edge Proxy - Registrar - Freeswitch


Clients connect using TLS and we use UDP for internal communication.


Edge proxy use force_send_socket(udp: and all have been
fine even for packets of around 1700 bytes.


Now we have installed the system in a new environment and have started to
see MTU problems and we want to switch to TCP for the internal


We have switched to setting the sent socket to tcp:
force_send_socket(tcp: but this fails.


We listen on the same port on both UDP and TCP.


With debug logging this is the only output:

2018-03-22T16:58:50.517287+00:00 err sipedge-qa-1 ERROR:tm:msg_send: send()
to for proto tcp/2 failed

2018-03-22T16:58:50.517669+00:00 err sipedge-qa-1 ERROR:tm:t_forward_nonack:
sending request failed


Any ideas?


Thanks in advance / Olle


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