asterisk users - Nov 2006 - Is it easy to route SIP/SDP and SIP/RTP through different routes ?

Hello,

The setup is :

Asterisk ------<www> ------- Router1---------<LAN> --------- SIP
Phones
|                                                              |
|------------------<pstn>----------Router2------------|

(I hope the sketch is understandable. If not, it could be summarized with :
"SIP hardphones on a given LAN are connected to an Asterisk server through
2
different routers. one is connected to PSTN, the over to the www)

For backup/failover puropose, is it easy to setup 2 seperate routers so that
RTP media flow goes through router1, and SIP/SDP goes through router2 ?
So that registration, signaling and so on benefit from Internet access flat
rates and time sensitive Voice packet benefit from  PSTN QoS.
This way, you don't even have to deal with RTP and NAT coexistence.

So ?
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