Sip passing through nat but rtp is not - no audio

Sip passing through nat but rtp is not
I'm looking at traffic leaving my router with a sniffer. I see SIP traffic but I do not see RTP traffic. The phones ring on both sides but I do not get any audio.
interface f0/0.100
ip address 192.168.10.1 255.255.255.0
ip nat outside
ip nat pool VoIP 192.168.10.1 192.168.10.1 prefix-length 24
ip nat inside source route-map VoIP pool VoIP overload
ip nat inside source static tcp 10.1.1.2 49201 192.168.10.54 49201 extendable
access-list 1 permit ip host 10.1.1.2 any
route-map VoIP permit 10
match ip address 1
match interface f0/0.100
set interface f0/0.100

Hello,
You can enable "ip nat service sip" or "ip nat service h323" and "ip nat
service h225" commands. As per the documentation, they are enabled by
default. In the latest IOS there is a new feature added to Cisco IOS that
ensures that even RTP packets get translated to one of the allowed ports as
specified by the RFC. The command to enable the feature is "ip nat service
allow-sip-even-rtp-ports"
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6640/pro
d_white_paper0900aecd80597bc7.html
Hope this helps.
Regards,
NT

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