[cisco-voip] DTMF fun

[Mark Holloway]

Try G.711 and see if the issue persists.  If it doesn't persist it's because you are getting tone distortion on the IP network caused by a compressed codec.

On Jan 20, 2010, at 1:26 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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