[cisco-voip] CUCM6+E1 PRI A-law

[Ryan Ratliff]

That is probably dependent on who sends the OLC first and what that  
party prefers vs the other one.

-Ryan

On Oct 29, 2009, at 3:52 PM, Oleg Skomorokhov wrote:

I've made sort of a test few minutes ago. I've unregistered the e1 pri  
(mgcp) from CUCM and configured it with voip dial peer ( session  
target to CUCM, added a h323 gateway instead mgcp gateway).

If i enable that dial-peer to use a voice-class codec with following  
preferences:

1 g711alaw
2 g711ulaw
3 g729r8

The negotiated codec will be g711 U-LAW (funny).

If i enable the dial-peer to use only the g711alaw codec, it will be  
negotiated (sh voice call status shows me that).



On Thu, Oct 29, 2009 at 10:36 PM, Ryan Ratliff <rratliff at cisco.com>  
wrote:
Correct, there is no way to change that preference.  We have a knob  
for turning off g.722 but that's it.

-Ryan

On Oct 29, 2009, at 3:34 PM, Oleg Skomorokhov wrote:

And looks like there's no way to reorder that preference.
Well, thanks anyway.

On Thu, Oct 29, 2009 at 10:08 PM, Ryan Ratliff <rratliff at cisco.com>  
wrote:
Not that I can tell.  CUCM makes no distinction between a-law and u- 
law for g.711.  The only reason a phone would use one vs the other is  
if the device the phone was talking to only advertised one and not the  
other.   Internally to CUCM there is a preference among codecs that  
use the same bandwidth.  For the 64kbps codecs this preference is g. 
722, g.711u, g.711a.

-Ryan

On Oct 29, 2009, at 2:59 PM, Oleg Skomorokhov wrote:

it's set to a-law, but no luck.

but forget the pri, is there a way to get intracluster calls negotiate  
711 a-law ? i mean between 2 nearby ip phones.

On Thu, Oct 29, 2009 at 9:41 PM, Ryan Ratliff <rratliff at cisco.com>  
wrote:
What is set for the PCM Type in the CCMAdmin web page for the PRI?

That's the only place I can see where you can set a-law vs u-law.

-Ryan

On Oct 29, 2009, at 2:36 PM, Oleg Skomorokhov wrote:

There are some problems when talking with TELCO's support. some  
cracking and knocking sounds. No slips or other errors on E1 present.

But mostly, it's just annoying me. Why should i use u-law in europe,  
if it was designed for US?

So, even if we forget the E1 PRI, how to make the INTRAcluster calls  
to negotiate g711 A-law codec?..

On Thu, Oct 29, 2009 at 9:31 PM, Ryan Ratliff <rratliff at cisco.com>  
wrote:
The compand type on your POTS leg has nothing to do with the codec or  
compand type on the voip leg.

Is this causing any problems or just something you noticed?

-Ryan

On Oct 29, 2009, at 2:20 PM, Oleg Skomorokhov wrote:

Hello all.

I've got a e1 pri line in my office, terminating by cisco 2821. The  
compand type for E1 (Europe) is A-law, and show voice port 0/0/0:15  
also tells me that.
E1 is registered via mgcp, and i also see the compand type A-law in  
options there.

When i press the question button twice during the pstn call, the  
negotiated codec is u-law.

The default codec in Region is "G711" (no option for a-law or u-law)

Is there such an option in CUCM to change the default modulation type  
for g711 codec?

Thank you.
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