Well -- this kind of surprises me. I would explain that of myself as the handset guys were worried about UDP timers in firewalls being set more aggressively, and addressed that by more frequent keep-alives for UDP which consume more power, that's still guessing though.
-jiri
At 13:20 12/11/2007, franz.edler@inode.at wrote:
I came accros one Nokia-S60 Guideline regarding SIP setting in the NAT/Firewall traversal section which say:"It is recommended to use TCP as the transport instead of UDP since even doubled battery life can be achieved with a UI always connected to a SIP service".
I cannt comment on the battery life issue, but the problem is with IP fragmentation. In case a message is fragmented because it exceeds the MTU size there is a good chance that the fragmented packets cannot traverse the firewall. This is because the port information is not repeated in fragmented packets.
regards Franz
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-- Jiri Kuthan http://iptel.org/~jiri/