[e2e] signaling performance on TCP

Fred Baker fred at cisco.com
Tue May 16 04:14:11 PDT 2006

I don't see why SCTP would fare one iota different than TCP. In  
context, they have essentially equivalent message exchange. SIP on  
UDP would do it in less RTTs, in that there would be no SYN/SYN-ACK  
or FIN/FIN-ACK. I think the real difference there is debateable, though.

Allocating excess capacity to a signaling channel and putting SIP  
into it basically allows SIP to bypass queues that form around file  
transfers. Personally, I think this is a good thing, and RFC 4542  
supports it.

On May 15, 2006, at 11:13 PM, weigengyu wrote:

> Hi,
> Can anyone give an answer to my question?
> 1. SIP will be the signaling protocol for IMS in 3GPP,and SIP can  
> be over TCP, UDP, or SCTP;
> 2. For SIP over TCP as signaling transfer, are there any analysis  
> model for the performance evaluation?
> 3. Somebody told me that there is no problem if you allocate enough  
> bandwidth to signaling channel.
>    (the enough bandwidth in engineering design may be 10% of total  
> transmission line capacity)
>    So, is there any measured data to support the above design.
> 4. Could you get better performance by SIP over SCTP than SIP over  
> TCP for signaling transfer?
> Gengyu

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