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(a)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
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