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Home > Archive > Voice over IP Cisco > March 2007 > Audio Codec
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| Ahmed Elnagar 2007-03-26, 1:11 pm |
| Hello all;
anybody knows how to change the Audio codec of IP Phones from G.711u to G.711a. this is not available from region configuration all I can set is just G.711. any ideas (I am using CM ver 4.1(3)sr2)
Thanks and Best Regards
Ahmed A. Elnagar
Network Field Engineer
Advanced Computer Technology (ACT)
16 Fawzy Ramah St.Off Shehab St.Mohandessin, Giza, Egypt
Postal Code:12411 Cairo Egypt
Mob: +2010-2833868
Website: www.act-eg.com
E-mail: aelnagar@act-eg.com
| |
| Kris Seraphine 2007-03-28, 1:11 pm |
| That's a good question. I thought it would be a service parameter but I
don't see one.
I think the phone will automatically negotiate with the gateway to choose
the alaw or ulaw but I don't know this for sure.
Maybe you can't change the companding type for IP phone to IP phone calls.
On 3/26/07, Ahmed Elnagar <aelnagar@act-eg.com> wrote:
>
> Hello all;
>
> anybody knows how to change the Audio codec of IP Phones from G.711u to
> G.711a. this is not available from region configuration all I can set is
> just G.711. any ideas (I am using CM ver 4.1(3)sr2)
>
> Thanks and Best Regards
> *
> Ahmed A. Elnagar
> *Network Field Engineer
>
> Advanced Computer Technology (ACT)
> 16 Fawzy Ramah St.Off Shehab St.Mohandessin, Giza, Egypt
> Postal Code:12411 Cairo Egypt
>
> *Mob**:* +2010-2833868
> *Website**: *www.act-eg.com
> *E-mail**: *aelnagar@act-eg.com
>
> ________________________________________
_______
> cisco-voip mailing list
> cisco-voip@puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>
>
--
kris seraphine
| |
| Matt Slaga \(US\) 2007-03-28, 1:11 pm |
| I believe this is a global service parameter setting.
From: cisco-voip-bounces@puck.nether.net
[mailto:cisco-voip-bounces@puck.nether.net] On Behalf Of Kris Seraphine
Sent: Wednesday, March 28, 2007 11:19 AM
To: Ahmed Elnagar
Cc: cisco-voip@puck.nether.net
Subject: Re: [cisco-voip] Audio Codec
That's a good question. I thought it would be a service parameter but I
don't see one.
I think the phone will automatically negotiate with the gateway to
choose the alaw or ulaw but I don't know this for sure.
Maybe you can't change the companding type for IP phone to IP phone
calls.
On 3/26/07, Ahmed Elnagar < aelnagar@act-eg.com
<mailto:aelnagar@act-eg.com> > wrote:
Hello all;
anybody knows how to change the Audio codec of IP Phones from G.711u to
G.711a. this is not available from region configuration all I can set is
just G.711. any ideas (I am using CM ver 4.1(3)sr2)
Thanks and Best Regards
Ahmed A. Elnagar
Network Field Engineer
Advanced Computer Technology (ACT)
16 Fawzy Ramah St.Off Shehab St.Mohandessin, Giza, Egypt
Postal Code:12411 Cairo Egypt
Mob : +2010-2833868
Website: www.act-eg.com
E-mail: aelnagar@act-eg.com
________________________________________
_______
cisco-voip mailing list
cisco-voip@puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip
--
kris seraphine
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| |
| Ahmed Elnagar 2007-03-28, 1:11 pm |
| No the Phones doesnot negotiate. I have a H323 trunk thorugh a gatekeeper which ends to a gateway using alaw. what happens is that the Phone runs with ulaw and the callmanager is doing the conversion for it. if I disconnect the callmanager the call is muted so I conclude from this that the callmanger is doing something for the call. also BTW I cheched the call on the gateway and I find it using alaw so there is a conversion from ulaw to alaw happening on the CM.
Thanks and Best Regards
Ahmed A. Elnagar
Network Field Engineer
Advanced Computer Technology (ACT)
16 Fawzy Ramah St.Off Shehab St.Mohandessin, Giza, Egypt
Postal Code:12411 Cairo Egypt
Mob: +2010-2833868
Website: www.act-eg.com
E-mail: aelnagar@act-eg.com
________________________________
From: Kris Seraphine [mailto:baryonyx5@gmail.com]
Sent: Wed 28-Mar-07 5:18 PM
To: Ahmed Elnagar
Cc: cisco-voip@puck.nether.net
Subject: Re: [cisco-voip] Audio Codec
That's a good question. I thought it would be a service parameter but I don't see one.
I think the phone will automatically negotiate with the gateway to choose the alaw or ulaw but I don't know this for sure.
Maybe you can't change the companding type for IP phone to IP phone calls.
On 3/26/07, Ahmed Elnagar < aelnagar@act-eg.com <mailto:aelnagar@act-eg.com> > wrote:
Hello all;
anybody knows how to change the Audio codec of IP Phones from G.711u to G.711a. this is not available from region configuration all I can set is just G.711. any ideas (I am using CM ver 4.1(3)sr2)
Thanks and Best Regards
Ahmed A. Elnagar
Network Field Engineer
Advanced Computer Technology (ACT)
16 Fawzy Ramah St.Off Shehab St.Mohandessin, Giza, Egypt
Postal Code:12411 Cairo Egypt
Mob : +2010-2833868
Website: www.act-eg.com <http://www.act-eg.com/>
E-mail: aelnagar@act-eg.com
________________________________________
_______
cisco-voip mailing list
cisco-voip@puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip
--
kris seraphine
| |
| Ahmed Elnagar 2007-03-28, 1:11 pm |
| Hello Matt;
No it is not I searched alot but I didnot find any parameter for this
Thanks and Best Regards
Ahmed A. Elnagar
Network Field Engineer
Advanced Computer Technology (ACT)
16 Fawzy Ramah St.Off Shehab St.Mohandessin, Giza, Egypt
Postal Code:12411 Cairo Egypt
Mob: +2010-2833868
Website: www.act-eg.com
E-mail: aelnagar@act-eg.com
________________________________
From: Matt Slaga (US) [mailto:Matt.Slaga@us.didata.com]
Sent: Wed 28-Mar-07 6:17 PM
To: Kris Seraphine; Ahmed Elnagar
Cc: cisco-voip@puck.nether.net
Subject: RE: [cisco-voip] Audio Codec
I believe this is a global service parameter setting.
From: cisco-voip-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net] On Behalf Of Kris Seraphine
Sent: Wednesday, March 28, 2007 11:19 AM
To: Ahmed Elnagar
Cc: cisco-voip@puck.nether.net
Subject: Re: [cisco-voip] Audio Codec
That's a good question. I thought it would be a service parameter but I don't see one.
I think the phone will automatically negotiate with the gateway to choose the alaw or ulaw but I don't know this for sure.
Maybe you can't change the companding type for IP phone to IP phone calls.
On 3/26/07, Ahmed Elnagar < aelnagar@act-eg.com <mailto:aelnagar@act-eg.com> > wrote:
Hello all;
anybody knows how to change the Audio codec of IP Phones from G.711u to G.711a. this is not available from region configuration all I can set is just G.711. any ideas (I am using CM ver 4.1(3)sr2)
Thanks and Best Regards
Ahmed A. Elnagar
Network Field Engineer
Advanced Computer Technology (ACT)
16 Fawzy Ramah St.Off Shehab St.Mohandessin, Giza, Egypt
Postal Code:12411 Cairo Egypt
Mob : +2010-2833868
Website: www.act-eg.com <http://www.act-eg.com/>
E-mail: aelnagar@act-eg.com
________________________________________
_______
cisco-voip mailing list
cisco-voip@puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip
--
kris seraphine
________________________________
Disclaimer: This e-mail communication and any attachments may contain confidential and privileged information and is for use by the designated addressee(s) named above only. If you are not the intended addressee, you are hereby notified that you have received this communication in error and that any use or reproduction of this email or its contents is strictly prohibited and may be unlawful. If you have received this communication in error, please notify us immediately by replying to this message and deleting it from your computer. Thank you.
| |
| Andre Beck 2007-03-29, 7:11 am |
| Hi,
On Wed, Mar 28, 2007 at 06:41:04PM +0200, Ahmed Elnagar wrote:
>
> No it is not I searched alot but I didnot find any parameter for this
Neither did I. AFAIK you cannot force CCM to use A-Law only or even
to prefer A-Law over =B5-Law. It will always prefer =B5-Law if the gateway
can provide it, resulting in unnecessary conversions (e.g. coming in on
from the ISDN PSTN as A-Law, converted by the gateway to =B5-Law and sent
to the phone when the phone would actually be able to playout A-Law).
I was able to force CCM to use A-Law by enforcing it on the gateway:
voice class codec 1
codec preference 1 g711alaw
dial-peer voice 10 voip
tone ringback alert-no-PI
destination-pattern [1-7].
progress_ind setup enable 3
voice-class codec 1
session target ipv4:192.168.123.1
dtmf-relay h245-alphanumeric
no vad
As soon as I allow =B5-Law, even when giving it lower preference in the
voice class codec statement, CCM will pick it instead, uselessly
requesting conversion. I'm also somewhat convinced that unnecessary
A-Law to =B5-Law conversion will reduce quality and further fax problems,
but this is just a guess.
BTW, when I read about newer phones like the 7941/61 class, I tripped
about a statement that they *only* speak G.711u, *not* G.711a. Now
that's clever...
Andre.
-- =
The _S_anta _C_laus _O_peration
or "how to turn a complete illusion into a neverending money source"
-> Andre Beck +++ ABP-RIPE +++ IBH Prof. Dr. Horn GmbH, Dresden <-
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