Cellular Network Infrastructure

I'm finally in the process of converting my working NITB instance over to the newer osmo-splits.

I am running the Stable Binary Packages.

The trouble is that i'm getting one way audio when sending calls to a local Asterisk server (Originating GSM caller hears silence. Terminated SIP caller can hear GSM user).

osmo-mgw spams these messages:
% <0000> mgcp_network.c:726 endpoint:0x0 can not patch PT because no suitable egress codec was found.
% <0000> mgcp_network.c:726 endpoint:0x0 can not patch PT because no suitable egress codec was found.
% <0000> mgcp_network.c:726 endpoint:0x0 can not patch PT because no suitable egress codec was found.
% <0000> mgcp_network.c:726 endpoint:0x0 can not patch PT because no suitable egress codec was found.
% <0000> mgcp_network.c:726 endpoint:0x0 can not patch PT because no suitable egress codec was found.
% <0000> mgcp_network.c:726 endpoint:0x0 can not patch PT because no suitable egress codec was found.

In reviewing the SIP Debug within Asterisk, I can see GSM in the SDP. I also see the same thing in osmo-sip-connector when setting the Sofia SIP debug very high.

As a test, I set MSC to use the Internal MNCC and i'm able to get two way audio between GSM Handsets -- however, as the end game is to use my Asterisk PBX, this is obviously not the best solution.

I've done my best to search, came across this: https://osmocom.org/issues/3550 which seems similar, but had no resolution explanation. That issue states it was an Asterisk NAT issue. For testing I toggled the NAT settings, no change.

Attaching all configs.
Am I missing something?