Port forwarding seems not working

[Nyutag]

Host: caribou
Archlinux - Linux 3.5.4-1
CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz
RAM: 1GiB

Guest: Zomby
Windows XP Pro SP3
RAM: 400MB

I have installed DellVoice on the guest and it need the audio port 13000 open to work.

NAT/Router Ok

On host:

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$ netstat -a
[...]
tcp        0      0      caribou:13000           *:*                     LISTEN
[...]
udp        0      0      *:13000                 *:*
[...]

I have follow the instruction here (balise fail) but that doesn't seem to work.

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www dot virtualbox dot org/manual/ch06.html#natforward

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$ vboxmanage modifyvm Zomby --natpf1 "dellvoice,tcp,,13000,,13000"

On guest via cmd:

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Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\Z>netstat /an
Active Connections
  Proto  Local Address          Foreign Address        State
  TCP    0.0.0.0:135            0.0.0.0:0              LISTENING
  TCP    0.0.0.0:445            0.0.0.0:0              LISTENING
  TCP    10.0.2.15:139          0.0.0.0:0              LISTENING
  TCP    127.0.0.1:1028         0.0.0.0:0              LISTENING
  TCP    127.0.0.1:5152         0.0.0.0:0              LISTENING
  UDP    0.0.0.0:445            *:*
  UDP    0.0.0.0:500            *:*
  UDP    0.0.0.0:4500           *:*
  UDP    10.0.2.15:123          *:*
  UDP    10.0.2.15:137          *:*
  UDP    10.0.2.15:138          *:*
  UDP    10.0.2.15:1900         *:*
  UDP    127.0.0.1:123          *:*
  UDP    127.0.0.1:1027         *:*
  UDP    127.0.0.1:1900         *:*

And when I tested the DellVoice software, I got the following error "unable to send/receive sound data! Port 13000 should be available."

Any help welcome