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RE: [Sip] Question about Poll: Proposal relating to keepalive, TCP, and UDP usage in draft-ietf-sip-outbound

Hi Brian,

Brian Stucker wrote:
>As I said, there are networks where TCP is less efficient than 
>UDP and there are no NAT complications to be concerned about.
>

Can you elaborate what kind of networks these typically are? Do you mean
that the networks are configured to prioritize UDP in some DiffServ'ish
manner, or some more fundamental issues with retransmissions etc. 

People often refer to TCP's inefficiency in the wireless access due to
non-congestion related packet loss. This can be an issue when
transfering large amounts of data. However, it is not relevant in case
of SIP/TCP where relatively short messages are sent back and forth. 

Markus

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