Limit RTP port from new Trunk provider

HI,
I switched to VOIP.MS. I have been fighting intermittent one-way-audio since I ported my DIDs.
VOIP.MS restricts RTP ports to 10000-20000.
in autoload_configs/switch.conf.xmll these appear to be defined:

I changed the end-port entry to 20000. That broke everything!
Now I get this trying to cconnect to my phone (Yealink t48s):
2024-10-29 20:12:17.837833 [NOTICE] switch_channel.c:1118 New Channel sofia/internal/220@192.168.1.188:12417 [3174ed87-17c3-4add-b58a-974f1fa9de33]
2024-10-29 20:12:17.837833 [DEBUG] mod_sofia.c:5089 (sofia/internal/220@192.168.1.188:12417) State Change CS_NEW → CS_INIT
2024-10-29 20:12:17.837833 [ERR] switch_core_session.c:538 Could not locate channel type {sip_from_uri=@64.136.173.30
2024-10-29 20:12:17.837833 [NOTICE] switch_ivr_originate.c:2955 Cannot create outgoing channel of type [{sip_from_uri=@64.136.173.30] cause: [CHAN_NOT_IMPLEMENTED]
2024-10-29 20:12:17.837833 [ERR] switch_core_session.c:538 Could not locate channel type sip_from_user=
2024-10-29 20:12:17.837833 [NOTICE] switch_ivr_originate.c:2955 Cannot create outgoing channel of type [sip_from_user=] cause: [CHAN_NOT_IMPLEMENTED]
2024-10-29 20:12:17.837833 [ERR] switch_core_session.c:538 Could not locate channel type sip_from_host=64.136.173.30}sofia
2024-10-29 20:12:17.837833 [NOTICE] switch_ivr_originate.c:2955 Cannot create outgoing channel of type [sip_from_host=64.136.173.30}sofia] cause: [CHAN_NOT_IMPLEMENTED]
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Any advice would be greatly appreciated.
I am still on 1.10.2 - it has been working problem free for over a year.

Sean

Do you have firewall rules that you would need to update also?
Make sure you set both start and end ports. Below are FreeSWITCH default port range. reloadxml and restart FreeSWITCH after updating

<!-- <param name="rtp-start-port" value="16384"/> -->
    <!-- <param name="rtp-end-port" value="32768"/> -->

Thanks for the response.
I have this:

and changed end to "20000", which produced the errors above.

My firewall is iptables and I have very restrictive rules on 5060:5080 and NOTHING else. I have disdabled iptables and will test from there.
Thanks,
Sean