hello, I am using FreePBX 22.214.171.124 and Asterisk 13.23.0 with pjsip outbound trunk, I did not find a way to dial out #21# (switch off the provider deviation service, switch on the service is made with *21NUMBER#)
I did not find an answer in the freepbx forum.
Leading hash sign seems to be eaten and does not make it through the trunk.
Using the freepbx interface, I tried multiple ways (dialing through custom feature code, etc.) and adding a custom dial plan in the trunk or outbound route (compose 21# and prepend #), etc. Nothing seems to work.
In contrast, dialing *21x.# through the trunk works well with setting up an outbound route dial plan (compose 21x.# and prepend *).
thx for any prospective tips