[jdev] Re: Question about Proxy65 support Voice Chat

[Heiner Wolf]

Hi,

BTW: we are working on a Voice solution for LLuna also based on RTP/UDP. There will be a TCP backup in case UDP is blocked. 

hw
--
Dr. Klaus H. Wolf
bluehands GmbH & Co.mmunication KG
http://www.bluehands.de/people/hw
+49 (0721) 16108 75
--
Jabber enabled Virtual Presence on the Web: http://www.lluna.de/
Open Source Future History: http://www.galactic-developments.com/


>-----Original Message-----
>From: jdev-bounces at jabber.org [mailto:jdev-bounces at jabber.org]On Behalf
>Of Ulrich Staudinger
>Sent: Thursday, April 21, 2005 11:11 AM
>To: Jabber software development list
>Subject: Re: [jdev] Re: Question about Proxy65 support Voice Chat
>
>
>
>
>Richard Dobson schrieb:
>
>>> Voice and audio is not like that. You will need to transfer 
>it reliably.
>>>
>>> TCP is what SIP/SDP has selected (there's another protocol 
>at that layer
>>> too that's been drafted for use). Their model of getting 
>around NATs and
>>> firewalls is also a lot like proxy65 in that a third party 
>server is 
>>> used.
>>
>>
>> Are you sure? I thought they used RTP, and I was under the 
>impression 
>> RTP uses UDP not TCP, as TCP is not appropriate for real time data 
>> (audio) due to various reasons that are outlined in the information 
>> about RTP.
>>
>> Richard
>>
>>
>Richard's right. UDP is used for transmission of RTP data. The frame 
>size for audio and video packets is about 20-100ms, so 
>dropouts are not 
>a serious threat to communication security.
>
>Regards,
>Ulrich
>
>
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