Re: Question on draft-ietf-sip-outbound-20 draft: multipleflowcreation

Am 31.08.09 19:11, schrieb Francois Audet:
> I would tend to disagree that a policy of "Use UDP preferably
> and switch to TCP if message is too big" is a good policy. Especially
> considering that you'd have to keep the TCP connection alive anyways.
>
> I believe that always using the TCP connection in this case would
> make more sense.
>
> But it's definitively legal.

I totally agree with this.

But from several years attending SIPit's I would highly recommend you to 
NOT mix UDP and TCP. From time to time I had already interoperability 
issues when my proxy did for example UDP to TCP conversion (and back). 
If you are talking/thinking about an UA implementation which mixes UDP 
and TCP on the first hop already I would anticipate lots of 
interoperability issues down the road. You should at least attend a 
SIPit to check how other proxy and UA implementations react on this. In 
the end any benefits which you might get from this design decision might 
be easily eaten up by the support efforts later.

Best regards
   Nils Ohlmeier
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