[Megaco] Megaco, SCTP and IP addresses

["Claudio Fontana" <claudio.fontana at gmail.com>]

Hello all,

I am monitoring some megaco [ver 1, BER, IPv4/SCTP/M3UA] traffic, and
I see something
that should _not_ be ok if I read the involved standards correctly.

I see the equivalent (data changed, but meaning preserved) of these two messages
on the wire, delta_t=3 milliseconds.
No ServiceChange or Notify between the two.

[message 1, Transaction REQUEST, tid=0x155d3327 ctxid=CHOOSE]
mid: 10.5.100.22/2945 ADD REQUEST
ip/sctp src: 10.5.100.22/2945 dest: 10.5.100.1/8009

[message 2, Transaction REPLY, tid=0x155d3327 ctxid = 0x0220c197]
mid: 10.5.100.1/8009 ADD REPLY
ip/sctp src:10.5.101.1/8009 dest: 10.5.101.22/2945

Now, H.248.4 says in the overview that for SCTP
"Responses must be sent to the address and port from which the
corresponding commands were sent, except if the response is to a
handoff or failover,
in which case the procedures of 11.5/H.248.1 apply."

This is not the case with the traffic I am seeing here.
Is there some exception I should know of, or is this simply wrong?

Thank you for your kind advice,

Claudio Fontana

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