sundance-communications.com/forum Forums TDM Business Telephone Systems Comdial Telephones & Systems Inband DTMF

We are trying to get a Dialogic gateway to receive proper inband DTMF info. from our FXII cabinets in order to use an IP PBX as a voicemail replacement for our MP5-COB blade. (I know we will lose many advanced integration features) We have the Dialogic connected via an FXISTM-C16 card to our FXII, running 198 17F. All we need is calling, called and redirect party information. I tried everything I could think of then had our local Comdial tech. out with a butt-set and he observed the system was sending calling party as FSK data between ring 1-2 but was waiting until ring 2-3 before sending called/redirect party info. as inband DTMF. (His words). The Dialogic unit can't use both FSK data and inband at the same time so I was hoping there would be some way to get the Comdial to send everything as inband DTMF. We already tried using a serial link without any success. Our local Comdial guy wasn't very much help, I have a funny feeling someone at Comdial/Vertical could answer my questions in 5 minutes but since I am technically an "end user" and they don't provide per incident support I am kind of stuck. Anybody have any ideas or directions I could go?

The FSK Caller ID data does arrive between the first and secong ring however the In Band DTMF does not arrive until the Dialogic answers the call. To prove this you have to listen with a buttset and you hear the data between ring 1 and 2 and you'll hear the DTMF only after the line is seized. What Dialogic device are you using as the Key Voice Voice mail uses Dialogic cards and accomplishes what you are trying to do. You can get a Windows based Voice Mail designed for the Comdial product very inexpensively (nudge, nudge, wink, wink) to do what you need without reinventing the wheel.

@kensiltra:
I'd also be interested to know which Dialogic board you're using - is it one of the JCT boards (D42JCT). This is something I'd be interested in doing...

-Nick

Or, if anyone else knows of a Dialogic card or any other brand that's compatible with Comdial's Digital Line cards, I'd appreciate that information!

Dialogic D/4 series, 120JCT series, and several Rhetorex/Brooktrout RS232/432 series are compatible with the analog ports on a Comdial. The Comdial digital boards only were supported by Rhetorex/Brooktrout IVPC series boards.

@kensiltra:
Ken,
I've been playing with switching out the voicemail system attached to the FX-II, and I've been using the Sangoma USBfxo devices connected to the IST card. This seems to work pretty well - I get the caller ID data and the DTMF digits without a problem.

My issue, now, is that the Asterisk system I'm trying to use as a replacement does not recognize the DTMF digit 'A' as the disconnect digit, so it just keeps recording after the line is disconnected. Still working on that one...

-Nick

Sorry I have not been watching this thread closely. Just to give an update.

I was actually using a Dialogic DMG1000 media gateway connected to analog ports on an FXISTM-C16 card to one of our FXIIs. A couple gotchas that we found:

- Since we had an MP5-C0B already running this was taking over and preventing DTMF from working; a confirmation call to Comdial support confirmed that its either one or the other (DTMF or serial) so for temporary testing sake we removed the MP5-C0B from the cabinet and was able to get redirect party information to flow correctly from the Comdial (after adding those analog extensions to the voicemail table of course). Due to restrictions on the Dialogic side it can only use DTMF or FSK data but not read it both at the same time meaning you can technically use it for voicemail but will never have "caller" info. displayed on your voicemail/IP side just the redirect of who the person was calling. Not a huge deal but in every voicemail the person calling you will appear as "unknown/anonymous", for some this isn't a huge issue.

- Luckily the Dialogic has some rule logic/processing that can be applied to remove the reason codes that the Comdial sends, the Dialogic was interpreting those incorrectly so we had to write some rules to strip the first digit then add another so the IP PBX side received correct routing info.

- We also were able to rule out that SMDI/serial integration is NOT possible between 3rd party devices and the Comdial, apparently Comdial used their own proprietary methods and not "standard" SMDI.

I do have a working proof of concept with our FXIIs, the Dialogic and 3cx IP PBX. Again, many of the advanced serial integration features are missing and currently can only receive the redirect party info. but it would be enough for a basic voicemail system replacement. Due to some of the missing features we are looking at what Vertical/Comdial has for us in the way of integration with their newer products. Your mileage may vary!