[cisco-voip] What would cause DTMF not to go through

[Ryan Ratliff]

CSCsv04751 was filed by one of the CME guys to track this.   It looks like
the phones are sending the dtmf digits in-band as well as out of band and
this is what causes the double keypresses.   It also appears this behavior
changes depending on if you are using the handset/headset/speakerphone.  
 

-Ryan 

 

  _____  

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ryan Ratliff
Sent: Monday, October 13, 2008 9:51 AM
To: 'Nick Thompson'; 'Scott Voll'; 'James Buchanan'
Cc: Dave_Landsiedel at bobcat.com; 'cisco voip'
Subject: Re: [cisco-voip] What would cause DTMF not to go through


I was doing some work on this Friday and there is definitely some noise
generated in-band by sccp phones on 8.4(1).  If you take a packet capture
and listen to the audio it sounds like a "blurp" sound (very technical, I
know) every time  you press a dtmf digit.  I think what is happening is that
this combined with the in-band dtmf generated by the gateway (dtmf should be
out of band from phone to cucm to the gateway) can cause all kinds of wierd
problems on the receiving end.  
 
I'm digging now to see if there's a bug already opened.  If not there will
be one by the end of the day.
 

-Ryan 

 

  _____  

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Nick Thompson
Sent: Sunday, October 12, 2008 10:15 PM
To: Scott Voll; James Buchanan
Cc: Dave_Landsiedel at bobcat.com; cisco voip
Subject: Re: [cisco-voip] What would cause DTMF not to go through



I am also running into some DTMF issues at an installation I am currently
doing utilizing 7962s on the latest firmware (SCCP42.8-4-1SR1S) as well as
7942s on firmware SCCP42.8-4-1SR1S.  However, I am using MGCP on my
gateways.  I've got various users running into issues with unrecognized
digits, multiple digit presses, among other things.  I'm actually glad to
see a few others are having this issue as the reports at this install have
been popping up a little more often.

 

Has anybody tried a downgrade of the phone firmware?

 

Thanks.

 

Nick Thompson

Senior Network Engineer

Corporate Technologies, LLC

E-Mail:  <mailto:nick.thompson at gocorptech.com> nick.thompson at gocorptech.com

 <http://www.gocorptech.com/> http://www.gocorptech.com/

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Scott Voll
Sent: Thursday, October 09, 2008 3:25 PM
To: James Buchanan
Cc: cisco-voip-bounces at puck.nether.net; Dave_Landsiedel at bobcat.com; cisco
voip
Subject: Re: [cisco-voip] What would cause DTMF not to go through

 

more wide spread.  They are G711, but thus far it's just one location
(multiple users) but they are the only ones that are using 7962 phones and
firmware 8.4.1.  Also.  I see a bunch of bugs for DTMF but they are all
related to SIP / CTI but these users are not using either of those.

 

Any more ideas?

 

Scott

On Tue, Oct 7, 2008 at 12:05 PM, James Buchanan <jbuchanan at ctiusa.com>
wrote:

The rtp-nte is used typically for SIP trunks. H245-alphanumeric is what you
would typically use. Have you determined this to be for one specific user or
is it more widespread?

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Scott Voll
Sent: Tuesday, October 07, 2008 2:01 PM
To: Dave_Landsiedel at bobcat.com
Cc: cisco-voip-bounces at puck.nether.net; cisco voip
Subject: Re: [cisco-voip] What would cause DTMF not to go through

 

H323

 

What's the difference between 

 

 dtmf-relay h245-alphanumeric

 

and 

 

dtmf-relay rtp-nte h245-alphanumeric 

??

 

CMM blade with IOS 12.4(15)T4

 

Thanks

 

Scott

On Tue, Oct 7, 2008 at 11:09 AM, <Dave_Landsiedel at bobcat.com> wrote:


If using dial peer voice voip via a H323 gateway make sure you have the
following line in that dial peer. 

  dtmf-relay rtp-nte h245-alphanumeric 
 
_________________________________ 

 

 

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