TP-Link MR200 voip (sip) no sound can be heard

There is no sound from the handset in the original firmware or in Openwrt. The microphone goes, the other party can hear me, but I can't hear her. I have a TP-Link MR 200 v1.1 O2 router, but it appears to be v1.
I tried the instructions and installed viz.:

opkg update
opkg install kmod-nf-nathelper-extra
/etc/init.d/firewall restart

cat << EOF >> /etc/sysctl.conf
/etc/init.d/sysctl restart

Then I found this code to try out:
sysctl net.netfilter.nf_conntrack_helper; \
iptables-save -c -t raw | grep -e PREROUTING -e sip

The terminal message is:

sysctl net.netfilter.nf_conntrack_helper; \
> iptables-save -c -t raw | grep -e PREROUTING -e sip
net.netfilter.nf_conntrack_helper = 1
-ash: iptables-save: not found

Please don't you know where the error could be, what, for example, to enable in the firewall?

You may want to check this:

Thanks for the tip, I'll try it. It works if I connect the mobile data via wifi hostpot and do wwan in openWRT. It also works on another Netgear WNDR 3700 v1 router, which I checked has the same settings. So there is a problem somewhere between the transmission between OpenWRT and part of the system from TP-Link, the author writes "The included modem in this device is running Android OS and has a hidden" WAN usb0 and WAN6 usb0.
There was a problem even with the original firmware, where it was not possible to operate even according to the TP-Link instructions, and I thought that OpenWRT would allow it.

Calling works when using Proton VPN on mobile. That's the only solution TP-Link has it broken even with the original firmware version. It's a bad company.

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