*CSCsb96163* [cisco-voip] cptone command behavior on certain model routers/hardware

[Erick Bergquist]

Update on this issue in case anyone else runs into
this...

CSCsb96163 was filed as CCM/IOS enhancement for this. 

--- Erick Bergquist <erickbe at yahoo.com> wrote:

> Hi,
> 
> I have a situation where the impedance command is
> being removed off voice-port configuration when the
> MGCP cfg changes and the gateway MGCP config is
> updated. 
> 
> This doesn't effect all gateways/routers though, and
> appears to effect the ISR models (2800/3800) and XM
> series gateways. This is not happening on 1760, 3700
> series, 2620, etc. 
> 
> MGCP pushes down cptone command (locale on call
> manager side) and on the ISRs and XM, when 'cptone
> us'
> is entered it also changes impedance to 600real.
> Just
> on some routers though, not all. The problem is I
> have
> client who has analog lines where 600Real is not the
> best match and cause voice quality issues, and the
> best match/sounding impedance is complex1. 
> 
> Now, I can remove the ccm-manager config command as
> a
> workaround, but that also means the call manager
> isn't
> in full control of the gateway which could be a
> problem at times. We could also change the locale on
> the call manager side GW config to one where cptone
> sets impedance to complex1 but that causes other
> problems with the way the line works and tones
> heard. 
> 
> Does anyone know if cptone command is suppose to
> change impedance on some model hardware, or not?
> I've
> been looking all over cisco and not able to find
> anything yet. 
> 
> Output from a 2610XM or 2801:
> 
> router(config-voiceport)#cptone US
> %Impedance also changed to 600Real
> 
> On 3700 series, 1760:
> 
> router(config-voiceport)#impedance complex2
> router(config-voiceport)#cptone NO
> router(config-voiceport)#Cptone VE
> router(config-voiceport)#do show run | inc imped
>  impedance complex2
> router(config-voiceport)#cptone US
> router(config-voiceport)#no impeda
> 
> If I do this on router only, with no changes made on
> CCM side, it will download new MGCP config and wipe
> out the impedance commands on effected
> models/hardware
> only.
> 
> ccm-manager config-download reset-xml-version
> ccm-manager config-download check-config reset (or
> restart)
> 
> If I just do a ccm-manager config-download
> check-config reset without making changes or
> clearing
> XML version, the commands do not get removed. Only
> when there is a difference. I think also on reboot
> but
> have not verified that yet.
> 
> 
> 
> 		
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