[cisco-voip] how codec transparent works?

[s m]

thank you Ryan,

i have no problem with sip and it is ok (although i do not know it has MTP
or not). i think transcoder may not needed because as i know, it translate
two different codecs to each other but in my scenario, both side uses
g711alaw. please let me know if i misunderstand it.


On Mon, May 11, 2015 at 11:31 AM, Ryan Huff <ryanhuff at outlook.com> wrote:

> The reason that is happening is due to media negotiation failure as you
> mention (both call legs are not offering the same codec capabilities). In
> that exact configuration, you would need a transcoder (which you could run
> on the router if you have enough DSP).
>
> Are you sold on h323 or can you do a full SIP trunk (with MTP) between
> cucm and asterisk?
>
> Thanks,
>
> Ryan
>
>
> -------- Original Message --------
> From: s m <sam.gh1986 at gmail.com>
> Sent: Monday, May 11, 2015 12:25 AM
> To: Ryan Huff <ryanhuff at outlook.com>
> Subject: Re: [cisco-voip] how codec transparent works?
> CC: cisco-voip at puck.nether.net
>
> hello Ryan,
>
> thank you for your reply. without codec transparent, my phone rings but
> when i answer i have no voice and it hangs up after 5 seconds. asterisk
> says "no answer". this is so strange for me. i think media negotiation
> failed, right? is there any hint to have h323 trunk to asterisk with
> specific codec (not transparent one)???
>
> On Sun, May 10, 2015 at 4:32 PM, Ryan Huff <ryanhuff at outlook.com> wrote:
>
>> Codec transparent just passes sdp through to the other call leg without
>> trying to do media negotiations.
>>
>> So without codec transparent,  what happens?
>> Thanks,
>>
>> Ryan
>>
>>
>> -------- Original Message --------
>> From: s m <sam.gh1986 at gmail.com>
>> Sent: Sunday, May 10, 2015 01:19 AM
>> To: cisco-voip at puck.nether.net
>> Subject: [cisco-voip] how codec transparent works?
>>
>> hello everybody,
>>
>> anybody knows how codec transparent works?
>>
>> i have a strange problem. i want to set h323 trunk between asterisk and
>> cisco 2800. it only works when i set codec transparent in dial-peer nodes.
>> show commands in cisco shows that i have a call with g711alaw but if i set
>> codec g711alaw in dial-peers, i do not have any success call. i know it is
>> codec compatibility problem. is there any difference between g711 codecs
>> which cisco and asterisk utilize? what happened when codec is set to
>> transparent? dose anyone know anything about it?
>>
>> thanks is advance
>> SAM
>>
>
>
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