Force/lock rtp ports in SPA 112/122.

Hi,
I hope someone can help me. I am looking for a setting inside the Cisco/Linksys spa 112/122 which can force the rtp source port to be the same on the sip provider - is that possible? When the spa 112/122 connects to the sip provider is the port number from the box is 16384(standard range 16384-16482 inside the spa) but on the sip provider will respons with eg. port 36741.
/Tom

Hi Bro
Before you proceed to add the line shown below, I'm guessing you're unable to access and PING 172.20.16.8 once you've successfully VPN in, am I right? If yes, which groupname and username did you use? Lastly, did you use IPSEC VPN Client or WebVPN?
access-list inside_nat0_outbound extended permit ip 10.20.60.0 255.255.255.0 172.20.16.0 255.255.255.0
Regards,
Ram

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Force/lock rtp ports in SPA 112/122.

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