MCS5100-2500 set no DTMF on meet me - PBX Info :: Your Free PBX, PABX and Telephone Information Resource

boylerman · 11-12-2006, 06:18 PM

Hello,
When 2500 sets call in to a meet me conference bridge over VoIP trunks; the DTMF is not recognize when the end user dials the password. The MCS5100 is running release 3.0.

SergSH · 11-21-2006, 12:05 AM

What kind of device used to connect 2500 sets to VoIP network?
Is this devise support RFC2833 or proprietary Nortel DTMF over SIP transmission method?

boylerman · 12-04-2006, 09:45 AM

We use CCIS between New York and Sussex 2000 PBXs. So it’s an NEC original protocol. Then to get it from the 2000 in Sussex to the Nortel is a standard PRI. Nortel wants us to put a T-berd on the PRI.

The CCIS is H.323 and the NEC is H.245

SergSH · 12-05-2006, 09:18 AM

MCS5100 don't support PRI, only SIP. What kind of SIP/PRI gateway do you use?

If I correctly understand your case you have the following chain:
"2500 analog set" - H323 - PRI - SIP - "MCS Meet-me conference"

What kind of codec do you use on H323 part of way and on MCS ?

PS What do you mean "NEC is h245"? H245 is a media control protocol not a signaling one.

boylerman · 12-05-2006, 10:59 AM

I just received a confirmation from the customer. They have a NEC2000 in NY. A NEC2000 in WI that are using CCIS (NEC private protocol). The NEC2000 in WI is connected to the Nortel PBX via PRI.

2500>Nec2000 NY>CCIS>Nec2000 WI>PRI>Nortel SIP>Meetme.

The NEC manual states that CCIS is orginal protocol. We also have the same issues on carrier VoIP.

SergSH · 12-05-2006, 11:54 PM

Have you tried to call from 2500 set to MCS user? Does this user hear the DTMF tones if 2500 will press the keys?

I think that possible cause is somewhere in voice transcoding from H323 to PRI on NEC2000 WI.Or just too much voice transcoding - from analog to H323, then from H323 to PRI, from PRI to SIP.

boylerman · 12-06-2006, 07:07 AM

I will try this today and let you know. Thanks.

SergSH · 12-06-2006, 09:52 AM

I think, you should try to use G711 codec on all voice path. It'll minimize the transcoding effect.

boylerman · 12-22-2006, 12:40 PM

I tried a 2500 set and it didn't work, but heard the tones. I have a case at GNTS, they want me to update the VGMCs to 8.4 (they tell me that 8.4 is backwards compatibile). I will have to ask my customer to try the G711. I'll update later.

boylerman · 04-26-2007, 11:01 AM

I have been told by Nortel that I am seeing DTMF Leakage. They determined this after sending me test gear that measured the tones. They have told me that the VGMC cards DSP's are "sensitive". They also said it is an industry wide issue.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
CS1000M patch Corrupted	Rey	NORTEL	2	07-07-2007 06:22 AM
Nortel Meridian Option 11	rlarin	Meridian Systems	11	05-16-2006 03:45 PM
CICS 7.0 Male voice only, static on T7316	grover	BCM and Norstar	2	03-21-2006 12:55 AM
Software Version	DeryckTech	Meridian Systems	1	02-11-2005 03:54 PM
DTMF AT&T Pincode Problem	current	Meridian Systems	5	12-26-2002 09:48 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)