We are having issues making VOIP / SIP calls using a RUTX11. When the problem occurs, ssh in and running dmesg shows the packets are dropped rather than routed:
[ 321.741365] nf_ct_sip: dropping packet: all ports in use for SDP media IN= OUT= SRC=10.13.179.* DST=77.240.*.* LEN=968 TOS=0x08 PREC=0x60 TTL=63 ID=15651 PROTO=UDP SPT=6061 DPT=5060 LEN=948
It is not a table full issue, but I've still fine tuned the netfilter config for timeouts / table size / etc, but still get the above.
I see on other routers where this occurs they recommend disabled the sip_helper. How can this be done on the RUTX11, and also if it breaks things further, how can it be reenabled?
On the other router it is:
configureset system conntrack modules sip disable