[cisco-voip] Delay in CNG detect - Connect first

[Nick Matthews]

There's a bug in IOS related to dB levels.  Not sure if this plays a
factor in this.

 CSCso69794: V.21 Fax Tone is not detected if the signal level is less
than -22 dB

It's in IOS versions 12.4(15)T, fixed in 12.4(15)T8.


-nick

On Tue, Apr 21, 2009 at 8:39 AM, Banerjee, Subhrojyoti (Network CC)
<subhrojyoti at hp.com> wrote:
> Hi All,
>
> I’m trying to figure out why the TCL is taking more than usual 2 CNG cycles
> (9 sec) to detect the tone. After connecting to the VM I can hear the fax
> send the CNG tone every 3 sec approximately. However it takes almost 8-10
> cycles to get the tone detected at Cisco end. I looked at the debugs for one
> call and it was about 33 sec. This is not something uniform and the time
> varies from call to call (same fax but multiple calls), between 25-35 sec.
>
> Apr 17 17:54:54.183 CEST: //13828//TCL :/tcl_PutsObjCmd: [Call 13828]
> Setting-up a VOICE call
> :
> :
> Apr 17 17:55:27.972 CEST: //13828//TCL :/tcl_PutsObjCmd: [Call 13828] A CNG
> tone was detected!
>
> This is not desired since for voice prompts which are small, fax tone will
> not be detected at all.
>
> Thanks in advance,
>
> Subhrojyoti
>
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