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

Oleg Skomorokhov pocketapl at nm.ru
Thu Oct 29 14:59:34 EDT 2009


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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>>
>>
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