Emergency call and prepend with A-D key

I have a similar problem to that described here:
https://community.freepbx.org/t/dial-patterns-outgoing-route

Do you think it’s enough?

in extensions_custom.conf

[from-internal-custom]
exten => 112,1,NoOp(Emergency call…)
exten => 112,n,Goto(from-internal,32C170${EXTEN},1)

Is this configuration correct, will not cause errors?

It’s been a while since that post was updated.

Did you try to add letters in the outbound route?

Yes, I tried, but freepbx ignores the letter “C”.
After saving the configuration, the letter “C” disappears.

There is no GUI support for using A-D dial characters, you will need to modify the dial string using custom dialplan and a predial hook: Hooking for fun and income

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