[SIPForum-discussion] TCP transport for SIP.

[Seshagiri Kondaveti]

If UDP is used as transport protocol then reliability is not achieved.

So to make it reliable, the sip application (ie application layer of  OSI model) uses retransmission mechanism(as stated in state machine diagram)  in the application layer.

But if you are using TCP , reliability is achieved due to transport layer which takes care about the retransmission of messages , in this case sip application layer doesn't  do retransmission.


Difference is incase UDP sip application takes care about reliability , but in case of TCP transport layer takes care.


Regards
sesh

________________________________
From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of AMIT ANAND
Sent: Tuesday, May 18, 2010 11:10 PM
To: ashok.pitambar at wipro.com
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] TCP transport for SIP.

Hi Ashok,

Except the mechanism for Transport Layer, every thing else remains the same as far as message processing is concern.
The only difference is three way handshake ( For setting up TCP connection).and ofcourse server has to keep track for this TCP connection using TCP syn , rst etc messages.


Cheers
Amit
On Tue, May 18, 2010 at 8:28 PM, <ashok.pitambar at wipro.com<mailto:ashok.pitambar at wipro.com>> wrote:
Hi All,

Does anybody has any idea about the TCP transport for SIP , How it is different from UDP transport in terms of functionality and parsing mechanism?

Regards,
Ashok Pitambar



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--
Thanks
Amit Anand

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