[SR-Users] Change in RTP Payload time on the fly

[Pranav Desai]

Hello,

Thank you for your comments.
My answers are inline.

> Hello,
>
> ptime and also the z flag are ms values, so a values of 6 or 8 ms are not
> the recommended length of time, it should be an integer
> multiple of 5 ms. I havn't yet a look the the source, but the nathelper
> doc
> say ZNN, maybe only the 12 is taken from your 120?

The 'ZNN' in the documentation might be misleading, since I tried with
'Z120' and the variable 'requested_nsamples' is set to 960 samples
(120/10*80).
This variable is used by RTP resizer to resize the RTP packets.

> But in fact the doc confuse with ZNN and an example of 100ms. Could you
> try
> again with 90?
>

I tried with ptime=80ms and ptime=60ms.
But, I still have the similar results, i.e. I get occasional packets with
ptime=40 and sometimes ptime=20ms.


Regards,
Pranav Desai

> regards,
> Andreas
>
> 2010/9/18 Pranav Desai <pdesai at signalogic.com>
>
>>
>> Hello,
>>
>> We have a proxy server setup that runs Kamailiov3.0.1 + RTPProxyv1.2.1.
>> Nathelper support has been enabled in Kamailio.
>>
>> On a certain route, we call force_rtp_proxy("z120"), i.e. with resizing
>> parameter 'z' and argument 120ms. During a call where endpoints have
>> negotiated the use of G729, RTPProxy sends packets with ptime=12
>> (120ms),
>> however occasionally rtpproxy sends packets with ptime 6(60ms), 8(80ms),
>> 4(40ms).
>>
>> Under what circumstance would RTPProxy send packets with ptime < 12 ?
>>
>> Regards,
>> Pranav Desai
>>
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>