[jdev] Re: Question about Proxy65 support Voice Chat
us at activestocks.de
Thu Apr 21 04:11:27 CDT 2005
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
> 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'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.
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