[SIPForum-discussion] TCP vs RTP

[lokesh agrawal]

RTCP partners RTP in the delivery and packaging of multimedia data, but does
not transport any data itself. It is used periodically to transmit control
packets to participants in a streaming multimedia session. The primary
function of RTCP is to provide feedback on the QOS being provided by RTP.

R u getting my point????



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