[cisco-voip] Nat skinny overload problem

[Mauro Celli]

I need to make nat for some phones (15/20 phones) in 2 subnet
Subnet1 172.20.10.0/24
Subnet2 192.168.10.0/24
Nat pool 1.0.1.21 1.0.1.149
I need a mapping 1 to 1.
I have try some config but:

ip nat pool Voce 1.0.1.21 1.0.1.149 netmask 255.255.255.0
This not work,all internal phones is natted with 1.0.1.21 (is always overloaded???)
ip nat pool Voce 1.0.1.21 1.0.1.149 netmask 255.255.255.0 match-host
This is not applicable, because i have two internal subnet
ip nat pool Voce 1.0.1.21 1.0.1.149 netmask 255.255.255.0 rotary
This work,but after 2/3 week, i found two phone with same natted address.

I need always a mapping 1->1 absolutely no overload is permette in my config.
How i can make this without making a manual
ip nat inside source static x.x.x.x x.x.x.x for every phone?
Thanks
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