you nailed it on the head. it works on g.711 codec at least that's what i read about rfc2833. here is some screenshots
i made them as attached files.

we have 4 ports for sip and each one is set to different codec could that be the issue? should i set them all to g.711? or is it have to be that way to make it connect to sip?

this is my first crack at working on a pbx. I'm so proud of myself. barely know what i'm doing and already fixed stuff.

I fixed Voicemail. our voice mail didn't work it was dead. I shut down the system pulled the sd card out moved the write protect tab to lock then back to unlock put back in. VM still didn't work shut it down again pulled out sd card again ensure write protect was on unlock. blew some air in the sd card slot put card back in booted system VM worked and all read only file errors and can't write block.old and other file errors in the error logs disappeared completely.

I just fixed day/night mode after some techs came to work on system they would break it more and more. found out in override section all 4 ports were set to day. i changed them to scheduled and changed the times. it's going to day night and lunch modes like it's supposed to.

daylight savings mode stopped working found section governing it and timetables were expired only went up to 2020 i updated tables with new years and dates etc.

what nuts i have yet to crack is....

only thing i need to figure out now is during daymode and only through auto attendant if someone dials 0 for the operator there is no option to leave a message in the general mailbox if no one picks up the phone it only gives an option to dial another extension or press 0 again for aa gain. If i dial the extension for the operator 201 through AA i will get an option to leave a message in the 201 mailbox which is the receptionist who is taking calls for the option 0 in AA or if i dial 201 extension from inside the office will get the option. But if dial 0 through AA no option. would like a way during day mode if phone rings and no one picks up callers can leave message in general mailbox.

extension 207 is set to dial to an external number and it does that. But if i dial the on call nurse which is an external number the PBX will just auto disconnect. will not even try to dial out .

PBX's are super hard. thanks for all your help. the last tech was a bomb they said they work on Samsung. En route tech said there are no techs here who work on Samsung but i will try came out didn't know how to connect to system and functions that worked before stopped After 6 hours going nowhere he tried to sell us a new system as a solution to fixing issues lol. we found another one and he decided to abandon us we were sad cuz he had alot of experience with Samsung and was helping us then decided to not return our calls or willing to make a trip we don't know why. we are out in the cold lol so working on it myself till can get lucky to get someone out here. good people are hard to find

The first tech said we had a bad MP10a card so we spend $400 on a replacement. But i was able to connect and access card. me thinks he didn't know what he was dong but that's me.

Attached Images
dm dtmf ex 1.png dm dtmf ex 2.png