Yes, both RTP and SIP should be different in each ATA account.
If every IP user agent (soft-phone, IP Phone, or ATA) is forced to use different listening SIP Ports (Eg. 5060, 5062, 5064, etc) and separate RTP ports (Eg. 5004. 5006, 5008, etc), the overall SIP setup will be more stable.
What I find most stable when multiple devices are being used:
1) Fix the private IP address of each SIP device
2) Set up SIP ports, RTP ports as indicated above
3) Use a STUN server
4) Forward the respective SIP and RTP ports to the individual device fixed IP address
Of course to do this, you must have full access to your router and private network.
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