> The RFC 3261 tries to enforce "congestion
safe" transport for SIP. A
> request larger than 1300 bytes should be sent over TCP
instead of UDP
> in order to avoid fragmentation. (If the TCP connection
establishment
> fails, the stack should try to use UDP.)
>
> The limit triggering switchover to TCP can be increased
with
> NTATAG_UDP_MTU(), given to
nta_agent_create()/nta_agent_set_params().
> The maximum value is 65507 (maximum length for the UDP
payload, 65535
> minus 28 bytes for UDP/IP headers).
Thanks for that explanation. I don't think that this is what
happened.
The request was quite small.
However, I found a solution in using the
"transport=udp" parameter at
NTA agent initialization time, in the 'contact_url' argument
of
nta_agent_create().
Regards
Stefan
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