[SIPForum-discussion] TCP vs RTP

[William Prusty]

Then when  we will go for RTCP????

 

________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of lokesh agrawal
Sent: Monday, April 23, 2007 2:58 PM
To: alexzhang at gdnt.com.cn
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] TCP vs RTP

 

Hi Alex,

 

Please make clear few points

1. No end-to-end protocol, including RTP, can ensure in-time delivery.
RTP does not define any mechanisms for recovering for packet loss

2. RTP can carry any data with real-time characteristics, such as
interactive audio and video. It can also be used for Text Conversation .

3. Services provided by RTP include: Payload-type identification,
Sequence numbering - PDU sequence number, Time stamping - allow
synchronization and jitter calculations, Delivery monitoring.

4. Applications using RTP are less sensitive to packet loss, but
typically very sensitive to delays, so UDP is a better choice than TCP
for such applications.

5. If you want to transfer data text (Non real) you hv to use TCP for
reliability.

If still u have any doubt please ask me.

 

 

 

Regards

Lokesh Agrawal

Member of Technical Staff

Persistent Systems Pvt. Ltd.

 

 

 

On 4/23/07, alexzhang at gdnt.com.cn <alexzhang at gdnt.com.cn> wrote: 

Hi Lokesh,

 

My question is: If RTP is based on the connectionless Oriented, can we
say this protocol is only applicable to the Audio and video
transporation? If we want to transfer data without any possible loss, is
it reliable to use RTP? 

 

-- A l e x

 

 

________________________________

From: discussion-bounces at sipforum.org [mailto:
discussion-bounces at sipforum.org <mailto:discussion-bounces at sipforum.org>
] On Behalf Of lokesh agrawal
Sent: Monday, April 23, 2007 4:33 PM
To: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] TCP vs RTP

 

Hi,

 

First of all let me tell you that TCP and RTP both are both different
purpose.

VoIP data packets live in RTP (Real-Time Transport Protocol) packets
which are inside UDP-IP packets

TCP is more making/terminating connections and RTP is for payloads and
data packets. 

 

VOIP data packets uses UDP, RTP and IP protocols for operation.

We can use TCP(Connection Oriented) in place of UDP(connectionless) but
VoIP doesn't use TCP because it is too heavy for real time applications
and for voice it will add delay in packets as it needs ACK for each and
every packet. 

 

 

Regards

Lokesh Agrawal

Persistent Systems Pvt. Ltd.

 

On 4/23/07, William Prusty <williamp at techmahindra.com > wrote: 

Whether TCP is capable to carry AUDIO , VIDEO data ?? if yes then why we
are using RTP in SIP to carry  AUDIO , VIDEO data

 

 

 

 

Plz answer .

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