[cisco-voip] DTMF fun

[Rhodium]

If he is seeing the correct DTMF using a debug h245, then wouldn't it stand to reason that the DTMF conversion from out of band to inband from PSTN right across to H.323 works? It must be correct if he is not seeing missing digits no the GW...

Just  thinking out aloud...

Jason

--- On Wed, 1/20/10, Ryan Ratliff <rratliff at cisco.com> wrote:

> From: Ryan Ratliff <rratliff at cisco.com>
> Subject: Re: [cisco-voip] DTMF fun
> To: "Madziarczyk, Jonathan" <JMad at cityofevanston.org>
> Cc: "Rhodium" <rhodium_uk at yahoo.co.uk>, "VOIP Group" <cisco-voip at puck.nether.net>
> Date: Wednesday, January 20, 2010, 8:51 PM
> What is the configuration of the
> dial-peer(s) on the router converting your DMS trunk to IP?
> 
> 
> It is the router's job to convert the IP-based DTMF method
> (whether in-band or oob) onto the PRI.   
> 
> What has to happen is that the DTMF capabilities of the
> MGCP gateway match that advertised by the H.323 gateway (or
> CUCM has an MTP that can convert between them).
> 
> -Ryan
> 
> On Jan 20, 2010, at 3:26 PM, Madziarczyk, Jonathan wrote:
> 
> Maybe I'm not explaining myself correctly, or I don't
> understand how it
> works...most likely a combination of both.  The link
> between my CUCM and
> the PBX is not H323 to H323.  the PBX thinks the
> gateway is a DMS100
> link, the CUCM thinks the gateway is a H323 gateway. 
> So I don't know
> that the PBX is even capable of understanding H245
> signaling, since it's
> getting it's DTMF inband at that point.  Does that
> sound correct?
> 
> Having said that I was able to run the debug h245 asn1 on
> my router,
> which does show me whether the DTMF is getting to the h323
> gateway or
> not.  I guess then next logical step is to see if it
> is making it to the
> VM without being distorted to the point that VM cannot
> recognize it.
> 
> 
> 
> -----Original Message-----
> From: Rhodium [mailto:rhodium_uk at yahoo.co.uk]
> 
> Sent: Tuesday, January 19, 2010 5:04 PM
> To: VOIP Group; Madziarczyk, Jonathan
> Subject: Re: [cisco-voip] DTMF fun
> 
> The easiest point for me to start to troubleshoot this
> would be the
> gateway's H.323 connection to the PABX.
> 
> CUCM sends DTMF via H245 signal (accepting H245
> alphanumeric [AN] only)
> so you need to determine what type of DTMF relay your PABX
> supports?
> Does it support H245 Signal or H245 AN.
> 
> You can run "debug h245 asn1" to see what type of relay is
> being used on
> the gateway (config dependent) and see whether all the
> digits are being
> sent to the PABX and received from the CUCM.. If you are
> seeing the
> correct digits, then you know that the PABX is not
> accepting all the
> digits, if you are not seeing all the digits, the problem
> is between the
> PSTN and your gateway. 
> 
> HTH.
> 
> 
> 
> 
> 
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