[SIPForum-techwg] TCP vs. UDP (actually, SIPconnect does *not* change SIP)

[Peter Dunkley]

Would a solution be to explicitly state that a SIPconnect compliant 
device MUST adhere to RFC 3261 - which means that UDP and TCP MUST both 
be supported.

However, a SIPconnect compliant device, when used within a SIPconnect 
compliant environment MUST NOT use UDP.

This means that backwards compatibility is ensured, and also makes it 
quite clear that there is no place for UDP going forward.  It also means 
that SIPconnect compliant devices do not require specific tests for UDP.

This would satisfy me because it leaves no scope for an engineer, 
beginning to work on a new implementation, starting from the SIPconnect 
recommendation and assuming that means that he does not have to support UDP.

Regards,

Peter

Eric Burger wrote:
> (1) I think you mean TCP is the default.
>
> (2) What do we gain by mentioning UDP at all?  If there are 507 test  
> cases for SIPconnect stuff, mentioning UDP means there are now 1014  
> test cases (507 for SIPconnect with TCP, 507 for SIPconnect with UDP).
>
> Yes, not mentioning UDP, but still supporting RFC 3261, means you  
> don't get to not do UDP.  However, it makes SIPconnect compliance  
> testing and verification much easier.
>
> [507 is just a random number; pick your guess as to what is the right  
> number.  The factor of two does not go away.]
>
>
> On May 18, 2008, at 1:36 PM, Richard Shockey wrote:
>
>   
>>> I agree.  This was my concern when I read MUST TCP, but only MAY UDP
>>> in
>>> the document.
>>>
>>> I believe it is perfectly acceptable to say that SIPconnect compliant
>>> devices MUST support TCP, but there are a lot of UDP only devices in
>>> use
>>> within networks right now.  These need to keep working when connected
>>> with SIPconnect 1.1 compliant devices or no enterprise or service
>>> provider will have any interest in it.
>>>
>>> To my mind that means that both TCP and UDP are MUSTs.  But, perhaps
>>> TCP
>>> should be RECOMMENDed as the default transport (with UDP as a fall-
>>> back)?
>>>       
>> Chair hat off. Yes .. both are MUST but STRONGLY RECOMMENDED that  
>> UDP is the
>> default.
>>
>>
>>     
>>> Regards,
>>>
>>> Peter
>>>
>>>       
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